2024 |
Mensah J, Yan P, Rawal A, Lee AF, Wilson K, Robinson N, et al., 'Catalytic Cracking of 1,3,5-Triisopropylbenzene and Low-Density Polyethylene over Hierarchical Y Zeolites and Al-SBA-15', ChemCatChem, 16 (2024)
|
|
|
2024 |
Abu Fara A, Rayson MR, Brent GF, Oliver TK, Stockenhuber M, Kennedy EM, 'Effect of NaHCO
|
|
|
2024 |
Weber NH, Grimison CC, Lucas JA, Mackie JC, Stockenhuber M, Kennedy EM, 'Influence of reactor composition on the thermal decomposition of perfluorooctanesulfonic acid (PFOS)', Journal of Hazardous Materials, 461 (2024) [C1]
Various reactor tubes (quartz, stainless steel 316 and stainless steel 253 MA) were used to examine their influence on the thermal decomposition of perfluorooctanesulfonic acid (P... [more]
Various reactor tubes (quartz, stainless steel 316 and stainless steel 253 MA) were used to examine their influence on the thermal decomposition of perfluorooctanesulfonic acid (PFOS) between 400 and 1000 °C. Using helium as a carrier gas, with the addition of 100 ¿ 300 ppm of PFOS to the feed gas, the influence of the reactor materials on PFOS decomposition was studied. The quartz reactor led to a notable reduction in the concentration of HF and substantial quantities of SiF4 were observed. Stainless steel 316 produced C2F4, HF, COF2 and SO2 as its primary products up to 800 °C. However, at temperatures above 800 °C, near quantitative removal of SO2 from the gas phase was observed, with the concomitant formation of a blue molybdenum sulfur complex. Stainless steel 253 MA, the composition of which contains over 1% Si produced substantial quantities of SiF4 but no significant decrease in the gas phase concentration of HF. Environmental implication: This research underscores the significant role of reactor material in the thermal treatment of PFAS, a globally widespread and enduring environmental contaminant. The findings have direct implications for the optimization of thermal treatment strategies aimed at mitigating PFAS contamination. The insight into how different reactor materials interact with PFOS during thermal treatment expands our understanding of potential destruction methods. This knowledge is crucial in the development of effective, sustainable strategies for managing persistent environmental pollutants like PFAS.
|
|
Nova |
2023 |
Yamashita H, Bian Z, Urakawa A, Stockenhuber M, 'The 12th International Conference on Environmental Catalysis (ICEC2022), Osaka (Japan), July 30th-August 2nd, 2022', APPLIED CATALYSIS B-ENVIRONMENTAL, 339 (2023)
|
|
|
2023 |
Yan P, Nur Azreena I, Peng H, Rabiee H, Ahmed M, Weng Y, et al., 'Catalytic hydropyrolysis of biomass using natural zeolite-based catalysts', Chemical Engineering Journal, 476 (2023) [C1]
Natural clinoptilolite (coded as Escott), synthetic BEA, and mixed Escott-BEA zeolites supported nickel and iron catalysts were employed for catalytic hydropyrolysis of eucalyptus... [more]
Natural clinoptilolite (coded as Escott), synthetic BEA, and mixed Escott-BEA zeolites supported nickel and iron catalysts were employed for catalytic hydropyrolysis of eucalyptus globulus leaves. Comparing non-catalytic pyrolysis and catalytic pyrolysis in N2, the use of catalysts along with H2 (30 bar) resulted in improved yields of liquid oil and gas products, with reduced production of biochar/coke. Moreover, the biochar from catalytic hydropyrolysis showed a higher mesopore surface area (97 m2/g) than non-catalytic biochar (74 m2/g). Incorporating a small amount of BEA into Escott weakens the metal-support interaction, enhances H2 adsorption activity and increases the catalyst acidity, leading to an improved aromatic monomers selectivity while preventing excessive cracking of liquid oil. Consequently, Ni-Fe/Escott-BEA catalyst shows the highest content of valuable liquid organic components. Ni-Fe/Escott, with the largest Ni particles and lowest acidity, exhibits higher selectivity to methane and naphthalenes products. In contrast, Ni-Fe/BEA with excessive acid sites exhibited significantly lower content of liquid organic products but higher yields of C2-C5 gas products and deposited carbon, primarily ascribed to its high acidity promoting coupling, cracking and deoxygenation reactions. The deactivation of Brønsted acid sites was more pronounced than Lewis acid sites, underscoring their crucial role in coupling reactions and leading to increased coke deposition.
|
|
Nova |
2023 |
Weber NH, Dixon LJ, Stockenhuber SP, Grimison CC, Lucas JA, Mackie JC, et al., 'Thermal decomposition of PFOA: Influence of reactor and reaction conditions on product formation', Chemical Engineering Science, 278 118924-118924 (2023) [C1]
|
|
Nova |
2023 |
Yan P, Tian X, Kennedy EM, Stockenhuber M, 'Advanced in situ IR spectroscopy study of anisole hydrodeoxygenation over Ni/SiO2 catalysts', Journal of Catalysis, 427 115102-115102 (2023) [C1]
|
|
Nova |
2023 |
Weber NH, Delva CS, Stockenhuber SP, Grimison CC, Lucas JA, Mackie JC, et al., 'Thermal Mineralization of Perfluorooctanesulfonic Acid (PFOS) to HF, CO
Utilizing air (O2) as the bath gas at reaction temperatures between 500 and 1000 °C, the thermal decomposition of perfluorooctanesulfonic acid (PFOS) in an a-alumina reactor was s... [more]
Utilizing air (O2) as the bath gas at reaction temperatures between 500 and 1000 °C, the thermal decomposition of perfluorooctanesulfonic acid (PFOS) in an a-alumina reactor was studied. It was found that in an air bath gas (and in the absence of water vapor), COF2 and trace amounts of C2F4 were detected. Quantum chemical calculations at the G4MP2 level of theory confirmed that CF2 radicals can react with O2 to form COF2 and an O (3P) atom. The inclusion of 2000 or 20 000 ppmv of water vapor (H2O(g)) to the air bath gas proved to be the key step to mineralizing all PFOS into hydrogen fluoride (HF), CO2, and SO2. At temperatures above 850 °C (0.95-0.84 s residence time), a feed of 20 000 ppmv of H2O(g) in air was observed to produce a product stream in which no gaseous fluorocarbon products were detected, with only HF, SO2, and CO2 being produced. A sulfur balance confirmed that 100 ± 5% of all the S in PFOS had converted into SO2 with a chemical kinetic model predicting in excess of 99.99999% destruction removal efficiency of PFOS at temperatures above 700 °C. Furthermore, from an elementary balance of F and C atoms, it was determined that at 1000 °C, approximately 99 ± 5% of F atoms present in PFOS have been converted into HF, and approximately 100 ± 5% of C atoms had been converted into CO2. A chemical kinetic model was developed to understand the importance of both O2 and water vapor in the overall thermal decomposition of PFOS, leading to complete mineralization. In the presence of both O2 and H2O(g), it was found that relatively high concentrations of OH radicals were produced, with significant contribution to OH formation attributed to the well-known chain branching reaction O(3P) + H2O ¿ OH + OH.
|
|
Nova |
2023 |
Zhao G, Yan P, Procter K, Adesina A, Jin Y, Kennedy E, Stockenhuber M, 'Effect of desilication on the catalytic activity of Fe-FER for direct, selective, partial oxidation of methane', Journal of Catalysis, 417 140-152 (2023) [C1]
The effect of desilication on the physic-chemical properties of ferrierite zeolite was investigated using spectroscopic and solid characterisation techniques including N2-adsorpti... [more]
The effect of desilication on the physic-chemical properties of ferrierite zeolite was investigated using spectroscopic and solid characterisation techniques including N2-adsorption, XRD, SEM, H2-TPR, NH3-TPD and in situ FTIR. Stability of active oxygen species formed from N2O over the Fe-FER catalysts and the catalytic activity for direct conversion of methane to value-added products at temperatures between 300 °C and 400 °C were studied. Ferrierite zeolites, pre-treated with 0.1 M, 0.2 M and 0.3 M NaOH solutions preserved the crystal structure of the ferrierite zeolite but their textural properties were significantly modified, leading to an increase in mesopore area and creating a greater concentration of terminal Si-OH groups, concomitant with increase in the amount of extra-framework Al and reduction in the number of bridging Si-OH-Al species. Batch-mode catalytic reaction studies of methane with N2O conducted in an in situ FTIR cell demonstrate that the methoxy groups formed on extraframework iron sites followed by the migration of these species to silicon defect sites, which resulted in a decline in the intensity of terminal Si-OH groups bands in the IR spectra. N2O-TPD experiments confirm that N2O is converted to N2, O2 and NO over Fe-FER catalysts at 350 °C. The decline in the desorption temperature of these products observed over Fe-FER catalysts treated with alkaline solution is consistent with a significant increase in the mesopore surface area from 28.3 m2/g to 102.4 m2/g. The peak areas of desorbed O2 and NO were estimated, and the different ratios of O2/NO observed on these catalysts appears to be related to the difference stabilities of surface oxygen species. Studies under continuous reaction conditions demonstrate that, at a similar level of methane conversion (ca. 2.8 %), Fe-FER catalysts prepared with the moderately alkaline solution (0.2 M NaOH) results the highest yield of methanol, dimethyl ether and formaldehyde. It is asserted that this enhanced selectivity is the result of the comparatively high concentrations of terminal silanol groups, Brønsted-acid sites, stability of active oxygen species and mesopore volume.
|
|
Nova |
2023 |
Yan P, Xi S, Peng H, Mitchell DRG, Harvey L, Drewery M, et al., 'Facile and Eco-Friendly Approach To Produce Confined Metal Cluster Catalysts.', Journal of the American Chemical Society, 145 9718-9728 (2023) [C1]
|
|
Nova |
2023 |
Yan P, Kennedy EM, Zhang H, Stockenhuber M, 'Catalytic hydropyrolysis of lignocellulosic biomass to BTX and biofuels over zeolite beta based catalysts', FUEL, 332 (2023) [C1]
|
|
Nova |
2022 |
Yan P, Tian X, Kennedy EM, Stockenhuber M, 'The role of Ni sites located in mesopores in the selectivity of anisole hydrodeoxygenation', CATALYSIS SCIENCE & TECHNOLOGY, 12 2184-2196 (2022) [C1]
|
|
Nova |
2022 |
Rashid MI, Benhelal E, Anderberg L, Farhang F, Oliver T, Rayson MS, Stockenhuber M, 'Aqueous carbonation of peridotites for carbon utilisation: a critical review', ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 29 75161-75183 (2022) [C1]
|
|
Nova |
2022 |
Nur Azreena I, Lau HLN, Asikin-Mijan N, Hassan MA, Izham SM, Safa Gamal M, et al., 'Hydrodeoxygenation of fatty acid over La-modified HZSM5 for premium quality renewable diesel production', Journal of Analytical and Applied Pyrolysis, 161 (2022) [C1]
In the present study, a series of La-HZSM5 catalysts were prepared through wet impregnation and investigated for the production of premium quality diesel fuel via hydrodeoxygenati... [more]
In the present study, a series of La-HZSM5 catalysts were prepared through wet impregnation and investigated for the production of premium quality diesel fuel via hydrodeoxygenation (HDO) of oleic acid (OA). Several parameters were evaluated, such as reaction temperature (360¿400 °C), H2 pressure (1¿5 MPa), La concentration (5¿20%), catalyst loading (1¿7 wt%), and reaction time (1¿4 h). At a reaction of 400 °C for 2 h under 5 MPa H2 pressure, the La(10)HZSM5(90) catalyst showed 97% hydrocarbon yield with 92% of diesel selectivity. The superior HDO activity by La(10)HZSM5(90) in producing high quality diesel is due to a sufficient number of weak + medium acid sites and its mesoporous structure. Vacuum distillation was complementary for producing high quality diesel fractions consisting of C17 fractions. The reusability of the La(10)HZSM5(90) catalyst was also demonstrated, though the catalyst still had coking activity.
|
|
Nova |
2022 |
Benhelal E, Rashid MI, Rayson MS, Brent GF, Oliver T, Stockenhuber M, Kennedy EM, 'Direct aqueous carbonation of heat activated serpentine: Discovery of undesirable side reactions reducing process efficiency (vol 242, pg 1369, 2019)', APPLIED ENERGY, 325 (2022)
|
|
|
2022 |
Weber NH, Delva CS, Stockenhuber SP, Grimison CC, Lucas JA, Mackie JC, et al., 'Modeling and Experimental Study on the Thermal Decomposition of Perfluorooctanesulfonic Acid (PFOS) in an ?-Alumina Reactor', INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 61 5453-5463 (2022) [C1]
|
|
Nova |
2022 |
Weber NH, Delva CS, Stockenhuber SP, Grimison CC, Lucas JA, Stockenhuber M, et al., 'Thermal Decomposition of Perfluorooctanesulfonic Acid (PFOS) in the Presence of Water Vapor', INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 61 15146-15155 (2022) [C1]
|
|
Nova |
2021 |
Yan P, Kennedy E, Stockenhuber M, 'Hydrodeoxygenation of guiacol over ion-exchanged ruthenium ZSM-5 and BEA zeolites', Journal of Catalysis, 396 157-165 (2021) [C1]
Ion exchanged Ru/ZSM-5 and Ru/BEA catalysts, prepared by replacing the extra framework NH4+ cations in zeolites with Ru3+ ions, are employed for the hydrodeoxygenation of guaiacol... [more]
Ion exchanged Ru/ZSM-5 and Ru/BEA catalysts, prepared by replacing the extra framework NH4+ cations in zeolites with Ru3+ ions, are employed for the hydrodeoxygenation of guaiacol. The performance results indicate ion-exchanged Ru zeolites, with extremely low Ru contents (~0.2 wt%), possess a high intrinsic HDO activity compared to the catalysts prepared by the incipient wetness impregnation method. On the basis of TEM, FTIR, XPS and TPD analysis, the NH4+ ions in zeolite were substituted by Ru species, with metal particles entered the zeolite cages and finely dispersed on the support. These ion-exchanged Ru particles exhibit a strong electronic interaction with oxygen atoms of zeolite framework with a mixed Ru(0)-Ru(III) species observed in the reduced samples. In contrast, only Ru0 was detected in the reduced impregnated Ru/ZSM-5. The partial-reduced Ru species over the ion-exchanged Ru/ZSM-5 catalyst shows a high H2 adsorption activity facilitating the hydrogenation of guaiacol to the saturated products (such as 2-methoxycyclohexanol). In addition, ion-exchanged Ru-ZSM-5 and Ru-BEA catalysts present a similar normalized cyclohexane formation rate (based on the concentration of acid sites), suggesting the acid sites play a pivotal role in the deoxygenation of 2-methoxycyclohexanol to cyclohexane.
|
|
Nova |
2021 |
I Nur Azreena, Lau HLN, Asikin-Mijan N, Hassan MA, Saiman Mohd Izham, Kennedy E, et al., 'A promoter effect on hydrodeoxygenation reactions of oleic acid by zeolite beta catalysts', Journal of Analytical and Applied Pyrolysis, 155 (2021) [C1]
In this study, various metal-modified zeolite beta-based catalysts such as La(10)zeo(90), Co(10)zeo(90), Fe(10)zeo(90), Mg(10)zeo(90), Mn(10)zeo(90) and Zn(10)zeo(90) were investi... [more]
In this study, various metal-modified zeolite beta-based catalysts such as La(10)zeo(90), Co(10)zeo(90), Fe(10)zeo(90), Mg(10)zeo(90), Mn(10)zeo(90) and Zn(10)zeo(90) were investigated in the hydrodeoxygenation (HDO) of oleic acid (OA) to produce renewable diesel. The La(10)zeo(90) catalyst showed a conversion of OA up to 99 % with 83 % C15 and C17 selectivity after the reaction at 350 °C for 2 h under 4 MPa H2 pressure. The superior activity of La(10)zeo(90) was attributed to the synergistic interaction between La-Si-Al, a sufficient amount of weak + medium acid sites and excellent textural properties (large pore diameter). Larger pore diameter of La(10)zeo(90) is highly desirable as it will generate greater diffusion of bulky molecules, thereby improving the accessibility of the reactant and hence excellent catalytic activity. The vacuum distillation was used to purify the crude liquid product (CLP), producing high-quality diesel fractions mainly comprising C14, C15, and C17 fractions.
|
|
Nova |
2021 |
Benhelal E, Hook JM, Rashid MI, Zhao G, Oliver TK, Rayson MS, et al., 'Insights into chemical stability of Mg-silicates and silica in aqueous systems using
This work investigates chemical stability of Mg-silicates and silica in aqueous systems in order to gain in-depth understanding of their dissolution and precipitation behaviour un... [more]
This work investigates chemical stability of Mg-silicates and silica in aqueous systems in order to gain in-depth understanding of their dissolution and precipitation behaviour under different conditions. The aim was to utilise the knowledge gained to develop an engineered carbon mineralisation technology for an efficient and cost competitive CO2 capture and utilisation. The results, based firmly on 29Si solid-state MAS NMR spectroscopy, and complementary techniques, demonstrate the influence of Si coordination (Qn) on the extent of Mg-silicates dissolution, as the increase in the number of neighbouring Si atoms in the structure of Mg-silicates reduced dissolution of Mg-silicates. While 100 and 80% of Q1(3 Mg) Mg-silicate dissolved in pH = 5 and 6.5, the extent of dissolution for Q2(2 Mg) was lower at values of 90 and 65% under the same conditions, while Q3(1 Mg) did not actually dissolve in solutions with pH = 5 and 6.5. The results of precipitation studies indicated the effect of Mg solubility on the structure and Mg content of the precipitated phases. While Mg-silicates with all three structures of Q1(3 Mg), Q2(2 Mg) and Q3(1 Mg) precipitated in the mildly alkaline environment (pH = 8.5) with the ratios of 20, 40 and 40% respectively, in concentrated acidic solutions of pH = 0, only pure silica (no Mg content) with Q3(1H)/Q4(0H, 0 Mg) having a ratio of 35 and 65% precipitated. The results of direct and indirect carbon mineralisation experiments showed that only 40 and 57 wt% of Mg content of thermally treated Mg-silicate was extracted respectively, consistent with 29Si NMR analyses, indicating that only intermediate Mg-silicate phases I and II with Q1(3 Mg) and Q2(2 Mg) structures were reactive, while other Mg-silicate phases remained inert. Another reason for limited Mg extraction in direct and indirect carbon mineralisation experiments is related to precipitation of a silica-rich phase/s on the surface of the reacting particles leading to passivation, again consistent with 29Si NMR analyses. This confirmed precipitation of Mg-silicate with a Q3(1 Mg) structure as well as hydrated silica Q3(1H) and silica Q4(0H, 0 Mg) in aqueous environments, similar to carbonation processes.
|
|
Nova |
2021 |
Yan P, Mensah J, Drewery M, Kennedy E, Maschmeyer T, Stockenhuber M, 'Role of metal support during ru-catalysed hydrodeoxygenation of biocrude oil', Applied Catalysis B: Environmental, 281 (2021) [C1]
|
|
Nova |
2021 |
Rashid MI, Benhelal E, Farhang F, Oliver TK, Stockenhuber M, Kennedy EM, 'Application of concurrent grinding in direct aqueous carbonation of magnesium silicates', Journal of CO2 Utilization, 48 (2021) [C1]
Formation of silica-rich passivation layers formed on the periphery of reacting feed particles is one of the primary obstacles in obtaining high magnesite yields during direct aqu... [more]
Formation of silica-rich passivation layers formed on the periphery of reacting feed particles is one of the primary obstacles in obtaining high magnesite yields during direct aqueous mineral carbonation of peridotites and serpentinites. The disruption of the silica-rich layer around partially reacted grains as a result of concurrent grinding on the degree of carbonation (magnesite yield) was investigated in this work. Three types of naturally-occurring magnesium silicate feedstocks, dunite, olivine and lizardite, as well as three types of grinding media, were examined. Discrete size fractions of feed samples, with and without grinding media, were carbonated. SEM readily disclosed the formation of a silica-rich shell around a magnesium rich core during carbonation. EDS analysis was employed to study the elemental composition of reacted particles' shell and core. The method confirmed that during concurrent grinding these silica-rich layers were removed and continuously produced a fresh surface available for further reaction. The removal of the silica-rich layer was shown to significantly improve magnesite yields up to a 600 % increase in yield. Among the three different grinding media used in this work, zirconia and stainless steel media resulted in similar and highest magnesite yields, which is believed to be due to a combination of their high densities and hardness. The findings of this research showed that enhanced magnesite yields could be achieved for all feedstock without the need for energy intensive pre-treatment steps (e.g. ultrafine grinding and heat-activation). Moreover, concurrent grinding resulted in a magnesite yield when raw lizardite was carbonated.
|
|
Nova |
2021 |
Yan P, Tian X, Kennedy EM, Tkachenko OP, Stockenhuber M, 'Influence of Promoters (Fe, Mo, W) on the Structural and Catalytic Properties of Ni/BEA for Guaiacol Hydrodeoxygenation', ACS Sustainable Chemistry and Engineering, 9 15673-15682 (2021) [C1]
Hydrodeoxygenation (HDO) of guaiacol was investigated over BEA-supported bimetallic Ni-Fe, Ni-Mo, and Ni-W catalysts in a continuous-flow reactor. The electronic properties of Ni ... [more]
Hydrodeoxygenation (HDO) of guaiacol was investigated over BEA-supported bimetallic Ni-Fe, Ni-Mo, and Ni-W catalysts in a continuous-flow reactor. The electronic properties of Ni were significantly modified following the addition of W and Fe as analyzed by X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption (TPD), which is well in line with density functional theory (DFT) calculations, suggesting that the formation of Ni-Fe and Ni-W alloys is thermodynamically favorable while the generation of a Ni-Mo alloy is unfavored. The HDO over 9 wt % Ni/BEA catalyst was significantly improved following the incorporation of small quantities (<2.2 wt %) of Mo or Fe, while the incorporation of W decreased the HDO rate. The selectivity to hydrogenation products over the Ni-Fe/BEA catalyst was not altered compared to that of Ni/BEA during the hydrogenation of toluene, indicating that the observed increase in guaiacol conversion was engendered by the promotion of the direct hydrogenolysis of guaiacol to aromatics over Ni-Fe species. The hydrogenation and HDO rates of the Ni-Mo/BEA catalyst were both higher than those of Ni/BEA, which was attributed to the increased Ni dispersion promoted by Mo as indicated by similar nickel turnover frequency (TOFNi) values observed over Ni/BEA and Ni-Mo/BEA.
|
|
Nova |
2021 |
Zhao G, Chodyko K, Benhelal E, Adesina A, Kennedy E, Stockenhuber M, 'Methane oxidation by N
Catalysts with different iron species distributions were developed by loading iron ions to ferrierite (FER) zeolite using liquid ion exchange (IE) and solid state ion exchange (SS... [more]
Catalysts with different iron species distributions were developed by loading iron ions to ferrierite (FER) zeolite using liquid ion exchange (IE) and solid state ion exchange (SSIE) methods, which in turn facilitates to study the relation between the nature of iron sites with the formation and stability of surface oxygen species, based on the comparable investigation of catalytic activity and selectivity to products over the catalysts, and the characterisation results obtained from a variety of spectroscopic and solid characterization techniques. IR spectra and NH3-TPD profiles demonstrate a greater extent of exchange of protons in bridging OH positions by iron cations with the Fe-FER-SSIE, in comparison to Fe-FER-IE catalyst. The primary catalytic species present in Fe-FER-IE are isolated Fe species in cation exchange positions, as indicated by UV¿vis spectra, while isolated and oligomeric extra-framework Fe species were present in Fe-FER-SSIE catalysts, which is consistent with H2-TPR profiles of N2O pre-treated catalysts and IR spectra of NO adsorption on the catalysts. N2O-TPD results demonstrate that the desorption of oxygen molecules (O2) released from surface oxygen species was observed at lower temperature and higher concentration from Fe-FER-IE than Fe-FER-SSIE. Higher ratio of N2O consumption/methane conversion over Fe-FER-IE was observed than Fe-FER-SSIE. With similar methane conversion, over Fe-FER-SSIE a higher selectivity to valuable products methanol, formaldehyde and dimethyl ether was observed than over Fe-FER-IE.
|
|
Nova |
2021 |
Weber NH, Stockenhuber SP, Delva CS, Abu Fara A, Grimison CC, Lucas JA, et al., 'Kinetics of Decomposition of PFOS Relevant to Thermal Desorption Remediation of Soils', Industrial and Engineering Chemistry Research, 60 9080-9087 (2021) [C1]
Kinetics of pyrolysis of the pollutant perfluorooctanesulfonic acid (PFOS) in inert bath gases have been studied in two flow reactors constructed of a-alumina and of stainless ste... [more]
Kinetics of pyrolysis of the pollutant perfluorooctanesulfonic acid (PFOS) in inert bath gases have been studied in two flow reactors constructed of a-alumina and of stainless steel (SS) at temperatures between 400 and 615 °C. Results from the SS reactor give support to previous and our own quantum chemical calculations based on smaller perfluorinated sulfonates, according to which initiation of decomposition of PFOS first takes place by elimination of HF to form an unstable a-sultone with a rate constant, k1. The sultone then rapidly liberates SO2 and forms perfluorooctanoyl fluoride with a rate constant, k2 with k2 » k1 such that the overall rate constant k' ¿ k1. Products observed from both reactors in the above temperature range comprised HF, SO2, and perfluorooctanoyl fluoride. The value of the rate constant for the formation of HF and SO2 measured in the SS reactor was found to be k1 = (1.3 ± 0.5) × 1014 exp(-253 ± 5 kJ/mol/RT) s-1.
|
|
Nova |
2021 |
Yan P, Kennedy E, Stockenhuber M, 'Natural zeolite supported Ni catalysts for hydrodeoxygenation of anisole', Green Chemistry, 23 4673-4684 (2021) [C1]
Natural and synthetic (BEA, MOR) zeolite-supported nickel (~5 wt%) catalysts were prepared and employed for the hydrogenation of toluene and hydrodeoxygenation of anisole in a con... [more]
Natural and synthetic (BEA, MOR) zeolite-supported nickel (~5 wt%) catalysts were prepared and employed for the hydrogenation of toluene and hydrodeoxygenation of anisole in a continuous-flow reactor. Ni/BEA and Ni/MOR display a higher level of metal dispersion and stronger metal-support interaction compared to the Ni/NZ and Ni/Escott catalysts, resulting in a higher concentration of charge-compensating Ni species and a larger high-temperature reduction peak. The Ni/BEA and Ni/MOR also present a significant mass of low-temperature desorbed H2(centred at 150 °C) based on H2-TPD, suggesting the H species are weakly adsorbed on small Ni clusters. In contrast, the H species were strongly adsorbed by the bulk Ni crystal over Ni/Escott and Ni/NZ, which were desorbed at maxima between 211 and 222 °C. We propose that the strongly adsorbed H species play a crucial role in the hydrogenation of toluene, leading to a significantly higher yield of methylcyclohexane over Ni/Escott and Ni/NZ compared to Ni/BEA and Ni/MOR. Both metal and acid sites are required in the hydrodeoxygenation of anisole. The strong Brønsted acid sites and numerous smaller Ni species over Ni/BEA facilitated the transalkylation of anisole to phenol and methylanisole and subsequently hydrogenolysis of phenol to benzene, followed by the hydrogenation of benzene to cyclohexane.
|
|
Nova |
2021 |
Azreena IN, Lau HLN, Asikin-Mijan N, Izham SM, Hassan MA, Kennedy E, et al., 'Hydrodeoxygenation of oleic acid for effective diesel-like hydrocarbon production using zeolite-based catalysts (Nov, 10.1007/s11144-021-02082-w, 2021)', REACTION KINETICS MECHANISMS AND CATALYSIS, 134 1085-1085 (2021)
|
|
|
2021 |
Azreena IN, Lau HLN, Asikin-Mijan N, Izham SM, Hassan MA, Kennedy E, et al., 'Hydrodeoxygenation of oleic acid for effective diesel-like hydrocarbon production using zeolite-based catalysts', Reaction Kinetics, Mechanisms and Catalysis, 134 1069-1083 (2021) [C1]
This study investigated the hydrodeoxygenation (HDO) of oleic acid (OA) that is abundantly found in palm oil for the production of renewable diesel. The effectiveness of mesoporou... [more]
This study investigated the hydrodeoxygenation (HDO) of oleic acid (OA) that is abundantly found in palm oil for the production of renewable diesel. The effectiveness of mesoporous catalysts, HZSM-5 and zeolite beta, in favoring diesel hydrocarbons was determined. The catalysts were activated by calcination at 550¿°C for 5¿h and their physicochemical properties were determined using X-ray diffraction (XRD), scanning electron microscopy (SEM), temperature-programmed desorption using ammonia probe molecules (TPD-NH3), and Brunauer¿Emmett¿Teller analysis (BET). XRD analysis of both zeolite beta and HZSM5 showed high crystalline size of 24 and 84¿nm, respectively. BET analysis found that the zeolite beta catalyst had a greater surface area (648 m2¿g-1) than HZSM5 (465¿m¿g-1) without significant differences in pore size and volume. According to the TPD-NH3 study, zeolite beta had the most weak + medium acid sites when compared to HZSM5. It should be noted that HZSM5 also demonstrated the presence of strong acid sites. The optimal conditions for both catalysts were 350¿°C, 4¿MPa hydrogen pressure, and 5% catalyst load over a 2¿h reaction period. From the results, the zeolite beta exhibited superior HDO reaction activity than HZSM5 with diesel selectivity ~ 77%.
|
|
Nova |
2021 |
Harvey L, Kennedy E, Stockenhuber M, 'In Situ XAFS Study of a Modified TS-1 Framework for Carbonyl Formation', Journal of Physical Chemistry C, 125 16483-16488 (2021) [C1]
The in situ X-ray absorption fine structure (XAFS) was measured in the titanium-peroxo system supported by titanium silicalite-1 (TS-1). After this, the complex was heated, in lin... [more]
The in situ X-ray absorption fine structure (XAFS) was measured in the titanium-peroxo system supported by titanium silicalite-1 (TS-1). After this, the complex was heated, in line with previous in situ FTIR studies, in order to reproduce the catalytic conditions in those studies which demonstrate a reaction pathway to reaction products other than epoxides, namely, carbonyls, which have not been reported previously on this type of catalyst.
|
|
Nova |
2021 |
Yan P, Kennedy E, Stockenhuber M, 'Hydrodeoxygenation of guaiacol over BEA supported bimetallic Ni-Fe catalysts with varied impregnation sequence', Journal of Catalysis, 404 1-11 (2021) [C1]
BEA supported Ni-Fe catalysts, prepared by various impregnation techniques, were characterised and examined for their activity for the hydrodeoxygenation (HDO) of guaiacol and hyd... [more]
BEA supported Ni-Fe catalysts, prepared by various impregnation techniques, were characterised and examined for their activity for the hydrodeoxygenation (HDO) of guaiacol and hydrogenation of toluene. The aim of the study was to explore the factors affecting the formation of Ni-Fe active species and explore the relationship between the concentration of surface Ni, Ni-Fe species and HDO activity. Catalysts prepared initially with Fe, or co-currently with Fe and Ni exhibited a higher level of HDO rate compared to catalyst that was prepared with Ni initially. When a catalyst was impregnated initially with Fe, metal-supported interaction was relatively weak, thus the formation of Ni-Fe species was promoted. In contrast, a reduced number of Ni sites was involved in the formation of Ni-Fe species when the catalyst was initially impregnated with Ni, resulting in a low HDO rate. The rate of cyclohexane formation is proportional to the concentration of surface Ni-Fe over the catalysts with similar Ni and Fe loadings but prepared by different impregnation sequences. The enhanced HDO rate is attributed to the hydrogenolysis activity of Ni-Fe species. The effect of Ni/Fe ratio on HDO activity was also investigated under differential conditions and the catalyst with a Ni/Fe mass ratio of 3.3 exhibited the highest rate of cyclohexane formation.
|
|
Nova |
2021 |
Mensah J, Yan P, Kennedy E, Drewery M, Stockenhuber M, 'Novel hierarchical core-shell BEA@NanoZSM-5 zeolite for improved cracking performance for 1,3,5-triisopropylbenzene and n-hexadecane', Microporous and Mesoporous Materials, 328 (2021) [C1]
To overcome diffusional limitations associated with the catalytic cracking of large hydrocarbons, a novel core-shell hierarchical zeolite has been developed and evaluated. Large, ... [more]
To overcome diffusional limitations associated with the catalytic cracking of large hydrocarbons, a novel core-shell hierarchical zeolite has been developed and evaluated. Large, branched hydrocarbons encounter diffusional limitations in micropores of zeolites for cracking reactions, a limitation overcome by improved textural properties of hierarchical zeolites, leading to enhanced cracking activity. This will result in an improvement in deactivation rate, cracking activity, and enhanced product selectivity towards light hydrocarbon products. The impact of chain length involving a long chain paraffin (hexadecane) and a highly branched aromatic (1,3,5-TIPB) was also investigated to study the influence of the presence of the micro-mesopore network in overcoming diffusion limitations. This paper investigates the use of hierarchical core-shell BEA@NanoZSM-5 in the catalytic cracking of 1,3,5 triisopropylbenzene (1,3,5-TIPB), and n-hexadecane (C16). The novel hierarchical composite was synthesized by preliminary seeding of the core BEA crystals and subsequent growth under hydrothermal conditions leading to the formation of an intergrown and distinctive nanocrystalline ZSM-5 shell zeolite. Evidence of the existence of a hierarchical structure was probed by Ar sorption utilising non-local density functional theory (NLDFT) pore size distribution analysis.
|
|
Nova |
2020 |
Benhelal E, Oliver TK, Farhang F, Hook JM, Rayson MS, Brent GF, et al., 'Structure of Silica Polymers and Reaction Mechanism for Formation of Silica-Rich Precipitated Phases in Direct Aqueous Carbon Mineralization', Industrial and Engineering Chemistry Research, 59 6828-6839 (2020) [C1]
|
|
Nova |
2020 |
Suleiman IA, Shawaqfeh AT, Stockenhuber M, Kennedy EM, 'Insights on the stability of cuprous chloride under high pressure: An equilibrium ab initio atomistic thermodynamics study', Journal of Physics and Chemistry of Solids, 136 (2020) [C1]
|
|
Nova |
2020 |
Shadravan V, Bukas VJ, Gunasooriya GTKK, Waleson J, Drewery M, Karibika J, et al., 'Effect of Manganese on the Selective Catalytic Hydrogenation of CO
|
|
Nova |
2020 |
Yan P, Li MMJ, Kennedy E, Adesina A, Zhao G, Setiawan A, Stockenhuber M, 'The role of acid and metal sites in hydrodeoxygenation of guaiacol over Ni/Beta catalysts', Catalysis Science and Technology, 10 810-825 (2020) [C1]
|
|
Nova |
2020 |
Zhao G, Adesina A, Kennedy E, Stockenhuber M, 'Formation of Surface Oxygen Species and the Conversion of Methane to Value-Added Products with N2O as Oxidant over Fe-Ferrierite Catalysts', ACS Catalysis, 10 1406-1416 (2020) [C1]
|
|
Nova |
2020 |
Hosseiniamoli H, Setiawan A, Adesina AA, Kennedy EM, Stockenhuber M, 'The stability of Pd/TS-1 and Pd/silicalite-1 for catalytic oxidation of methane-understanding the role of titanium', Catalysis Science and Technology, 10 1193-1204 (2020) [C1]
|
|
Nova |
2020 |
Weber NH, Stockenhuber SP, Benhelal E, Grimison CC, Lucas JA, Mackie JC, et al., 'Products and mechanism of thermal decomposition of chlorpyrifos under inert and oxidative conditions', Environmental Science: Processes and Impacts, 22 2084-2094 (2020) [C1]
Chlorpyrifos (CPF) is a widely used pesticide; however, limited experimental work has been completed on its thermal decomposition. CPF is known to decompose into 3,5,6-trichloro-2... [more]
Chlorpyrifos (CPF) is a widely used pesticide; however, limited experimental work has been completed on its thermal decomposition. CPF is known to decompose into 3,5,6-trichloro-2-pyridinol (TCpyol) together with ethylene and HOPOS. Under oxidative conditions TCpyol can decompose into the dioxin-like 2,3,7,8-tetrachloro-[1,4]-dioxinodipyridine (TCDDPy). With CPF on the cusp of being banned in several jurisdictions worldwide, the question might arise as to how to safely eliminate large stockpiles of this pesticide. Thermal methods such as incineration or thermal desorption of pesticide-contaminated soils are often employed. To assess the safety of thermal methods, information about the toxicants arising from thermal treatment is essential. The present flow reactor study reports the products detected under inert and oxidative conditions from the decomposition of CPF representative of thermal treatments and of wildfires in CPF-contaminated vegetation. Ethylene and TCpyol are the initial products formed at temperatures between 550 and 650 °C, although the detection of HOPOS as a reaction product has proven to be elusive. During pyrolysis of CPF in an inert gas, the dominant sulfur-containing product detected from CPF is carbon disulfide. Quantum chemical analysis reveals that ethylene and HOPOS undergo a facile reaction to form thiirane (c-C2H4S) which subsequently undergoes ring opening reactions to form precursors of CS2. At elevated temperatures (>650 °C), TCpyol undergoes both decarbonylation and dehydroxylation reactions together with decomposition of its primary product, TCpyol. A substantial number of toxicants is observed, including HCN and several nitriles, including cyanogen. No CS2 is observed under oxidative conditions-sulfur dioxide is the fate of S in oxidation of CPF, and quantum chemical studies show that SO2 formation is initiated by the reaction between HOPOS and O2. The range of toxicants produced in thermal decomposition of CPF is summarised.
|
|
Nova |
2020 |
Rashid MI, Benhelal E, Farhang F, Stockenhuber M, Kennedy EM, 'Magnesium Leachability of Mg-Silicate Peridotites: The Effect on Magnesite Yield of a Mineral Carbonation Process', MINERALS, 10 (2020) [C1]
|
|
Nova |
2020 |
Yan P, Mensah J, Adesina A, Kennedy E, Stockenhuber M, 'Highly-dispersed Ni on BEA catalyst prepared by ion-exchange-deposition-precipitation for improved hydrodeoxygenation activity', Applied Catalysis B: Environmental, 267 (2020) [C1]
|
|
Nova |
2020 |
Rashid MI, Benhelal E, Farhang F, Oliver TK, Stockenhuber M, Kennedy EM, 'Application of a concurrent grinding technique for two-stage aqueous mineral carbonation', Journal of CO2 Utilization, 42 (2020) [C1]
|
|
Nova |
2020 |
Yan P, Drewery M, Mensah J, Mackie JC, Kennedy E, Stockenhuber M, 'Study on Catalyst Deactivation During the Hydrodeoxygenation of Model Compounds', Topics in Catalysis, 63 778-792 (2020) [C1]
|
|
Nova |
2020 |
Zhao G, Drewery M, Mackie J, Oliver T, Kennedy EM, Stockenhuber M, 'The Catalyzed Conversion of Methane to Value-Added Products', Energy Technology, 8 (2020) [C1]
|
|
Nova |
2020 |
Yan P, Bryant G, Li MMJ, Mensah J, Kennedy E, Stockenhuber M, 'Shape selectivity of zeolite catalysts for the hydrodeoxygenation of biocrude oil and its model compounds', Microporous and Mesoporous Materials, 309 (2020) [C1]
|
|
Nova |
2019 |
Dharmarathne NK, Mackie JC, Lucas J, Kennedy EM, Stockenhuber M, 'Mechanisms of thermal decomposition of cyclodiene pesticides, identification and possible mitigation of their toxic products', Proceedings of the Combustion Institute, 37 1143-1150 (2019) [C1]
|
|
Nova |
2019 |
Drewery M, Harvey L, Bryant G, Kennedy EM, Stockenhuber M, 'Utilization of Glycerol and its Derivatives in a Nickel-Based SOFC', Energy Technology, 7 80-85 (2019) [C1]
|
|
Nova |
2019 |
Dharmarathne NK, Mackie JC, Kennedy EM, Stockenhuber M, 'Thermal oxidation of dieldrin and concomitant formation of toxic products including polychlorinated dibenzo-p-dioxin and dibenzofuran (PCDD/F)', Chemosphere, 225 209-216 (2019) [C1]
|
|
Nova |
2019 |
Mowla O, Kennedy E, Stockenhuber M, 'Mass transfer and kinetic study on BEA zeolite-catalysed oil hydroesterification', Renewable Energy, 135 417-425 (2019) [C1]
|
|
Nova |
2019 |
Zhao G, Benhelal E, Adesina A, Kennedy E, Stockenhuber M, 'Comparison of Direct, Selective Oxidation of Methane by N2O over Fe-ZSM-5, Fe-Beta, and Fe-FER Catalysts', JOURNAL OF PHYSICAL CHEMISTRY C, 123 27436-27447 (2019) [C1]
|
|
Nova |
2019 |
Rashid MI, Benhelal E, Farhang F, Oliver TK, Rayson MS, Brent GF, et al., 'Development of Concurrent grinding for application in aqueous mineral carbonation', Journal of Cleaner Production, 212 151-161 (2019) [C1]
|
|
Nova |
2019 |
Benhelal E, Rashid MI, Rayson MS, Brent GF, Oliver T, Stockenhuber M, Kennedy EM, 'Direct aqueous carbonation of heat activated serpentine: Discovery of undesirable side reactions reducing process efficiency', Applied Energy, 242 1369-1382 (2019) [C1]
|
|
Nova |
2019 |
Farhang F, Oliver TK, Rayson MS, Brent GF, Molloy TS, Stockenhuber M, Kennedy EM, 'Dissolution of heat activated serpentine for CO2 sequestration: The effect of silica precipitation at different temperature and pH values', Journal of CO2 Utilization, 30 123-129 (2019) [C1]
|
|
Nova |
2019 |
Rashid MI, Benhelal E, Farhang F, Oliver TK, Rayson MS, Brent GF, et al., 'ACEME: Direct Aqueous Mineral Carbonation of Dunite Rock', Environmental Progress and Sustainable Energy, 38 (2019) [C1]
|
|
Nova |
2019 |
Benhelal E, Rashid MI, Rayson MS, Oliver TK, Brent G, Stockenhuber M, Kennedy EM, ' ACEME : Synthesis and characterization of reactive silica residues from two stage mineral carbonation process', Environmental Progress and Sustainable Energy, 38 (2019) [C1]
|
|
Nova |
2019 |
Li JPH, Kennedy EM, Adesina AA, Stockenhuber M, 'Mechanistic insights into the Knoevenagel condensation reaction over ZnO catalysts: Direct observation of surface intermediates using in situ FTIR', Journal of Catalysis, 369 157-167 (2019) [C1]
|
|
Nova |
2019 |
Kennedy E, Stockenhuber M, Oliver T, Brent G, Rayson M, 'Introduction to the special section: Papers from the International Conference on Accelerated Carbonation for Environmental and Material Engineering', ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY, 38 (2019)
|
|
|
2019 |
Oliver TK, Farhang F, Hodgins TW, Rayson MS, Brent GF, Molloy TS, et al., 'CO2 Capture Modeling Using Heat-Activated Serpentinite Slurries', ENERGY & FUELS, 33 1753-1766 (2019) [C1]
|
|
Nova |
2019 |
Abu Fara A, Rayson MR, Brent GF, Oliver TK, Stockenhuber M, Kennedy EM, 'Formation of magnesite and hydromagnesite from direct aqueous carbonation of thermally activated lizardite', Environmental Progress and Sustainable Energy, 38 (2019) [C1]
|
|
Nova |
2018 |
Benhelal E, Rashid MI, Rayson MS, Prigge JD, Molloy S, Brent GF, et al., 'Study on mineral carbonation of heat activated lizardite at pilot and laboratory scale', Journal of CO2 Utilization, 26 230-238 (2018) [C1]
|
|
Nova |
2018 |
Shadravan V, Kennedy E, Stockenhuber M, 'An experimental investigation on the effects of adding a transition metal to Ni/Al2O3 for catalytic hydrogenation of CO and CO2 in presence of light alkanes and alkenes', CATALYSIS TODAY, 307 277-285 (2018) [C1]
|
|
Nova |
2018 |
Mowla O, Kennedy E, Stockenhuber M, 'Hydroesterification of bio-oils over HZSM-5, BETA and Y zeolites', CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY, 20 727-738 (2018) [C1]
|
|
Nova |
2018 |
Mosallanejad S, Dlugogorski BZ, Kennedy EM, Stockenhuber M, 'On the Chemistry of Iron Oxide Supported on -Alumina and Silica Catalysts', ACS Omega, 3 5362-5374 (2018) [C1]
|
|
Nova |
2018 |
Cheng Y, Wang J, Han W, Song Y, Liu W, Yang L, et al., 'Catalytic coupling of CH4 with CHF3 for the synthesis of VDF over LaOF catalyst', GREENHOUSE GASES-SCIENCE AND TECHNOLOGY, 8 587-602 (2018) [C1]
|
|
Nova |
2018 |
Stockenhuber M, 'Catalysis Society of Australia', ChemCatChem, 10 1481-1482 (2018)
|
|
|
2018 |
Hosseiniamoli H, Bryant G, Kennedy EM, Mathisen K, Nicholson D, Sankar G, et al., 'Understanding Structure-Function Relationships in Zeolite-Supported Pd Catalysts for Oxidation of Ventilation Air Methane', ACS CATALYSIS, 8 5852-5863 (2018) [C1]
|
|
Nova |
2018 |
Benhelal E, Rashid MI, Holt C, Rayson MS, Brent G, Hook JM, et al., 'The utilisation of feed and byproducts of mineral carbonation processes as pozzolanic cement replacements', JOURNAL OF CLEANER PRODUCTION, 186 499-513 (2018) [C1]
|
|
Nova |
2018 |
Mowla O, Kennedy E, Stockenhuber M, 'In-situ FTIR study on the mechanism of both steps of zeolite-catalysed hydroesterification reaction in the context of biodiesel manufacturing', Fuel, 232 12-26 (2018) [C1]
|
|
Nova |
2018 |
Khan NA, Kennedy EM, Dlugogorski BZ, Adesina AA, Stockenhuber M, 'A proposed reaction mechanism for the selective oxidation of methane with nitrous oxide over Co-ZSM-5 catalyst forming synthesis gas (CO + H-2)', INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 43 13133-13144 (2018) [C1]
|
|
Nova |
2018 |
Gaikwad V, Kennedy E, Mackie J, Holdsworth C, Molloy T, Kundu S, et al., 'Process for Chloroform Decomposition: Nonthermal Plasma Polymerization with Methane and Hydrogen', INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 57 9075-9082 (2018) [C1]
|
|
Nova |
2018 |
Stockenhuber M, 'Preface: Environmental (ICEC)', CATALYSIS TODAY, 307 1-1 (2018)
|
|
|
2017 |
Khan NA, Kennedy EM, Dlugogorski BZ, Adesina AA, Stockenhuber M, 'Reaction of nitrous oxide with methane to synthesis gas: A thermodynamic and catalytic study', JOURNAL OF ENERGY CHEMISTRY, 26 155-162 (2017) [C1]
|
|
Nova |
2017 |
Li JPH, Adesina AA, Kennedy EM, Stockenhuber M, 'A mechanistic study of the Knoevenagel condensation reaction: New insights into the influence of acid and base properties of mixed metal oxide catalysts on the catalytic activity', Physical Chemistry Chemical Physics, 19 26630-26644 (2017) [C1]
|
|
Nova |
2017 |
Khan NA, Kennedy EM, Dlugogorski BZ, Adesina AA, Stockenhuber M, 'Cobalt Species Active for Nitrous Oxide (N2O) Decomposition within a Temperature Range of 300-600 degrees C', AUSTRALIAN JOURNAL OF CHEMISTRY, 70 1138-1145 (2017) [C1]
|
|
Nova |
2017 |
Dharmarathne NK, Mackie JC, Kennedy EM, Stockenhuber M, 'Gas phase pyrolysis of endosulfan and formation of dioxin precursors of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F)', PROCEEDINGS OF THE COMBUSTION INSTITUTE, 36 1119-1127 (2017) [C1]
|
|
Nova |
2017 |
Setiawan A, Kennedy EM, Stockenhuber M, 'Development of Combustion Technology for Methane Emitted from Coal-Mine Ventilation Air Systems', ENERGY TECHNOLOGY, 5 521-538 (2017) [C1]
|
|
Nova |
2017 |
Dharmarathne NK, Mackie JC, Kennedy EM, Stockenhuber M, 'Mechanism and Rate of Thermal Decomposition of Hexachlorocyclopentadiene and Its Importance in PCDD/F Formation from the Combustion of Cyclodiene Pesticides', JOURNAL OF PHYSICAL CHEMISTRY A, 121 5871-5883 (2017) [C1]
|
|
Nova |
2017 |
Stanger R, Tran QA, Smith N, Kennedy E, Stockenhuber M, Lucas J, Wall T, 'Separation and analysis of high range extractable molecules formed during coal pyrolysis using coupled thin layer chromatography-imaging mass spectrometry (TLC-LDI-IMS)', FUEL, 196 269-279 (2017) [C1]
|
|
Nova |
2017 |
Mosallanejad S, Dlugogorski BZ, Kennedy EM, Stockenhuber M, 'Adsorption of 2-Chlorophenol on the Surface of Silica- and Alumina-Supported Iron Oxide: An FTIR and XPS Study', CHEMCATCHEM, 9 481-491 (2017) [C1]
|
|
Nova |
2017 |
Suleiman IA, Stockenhuber M, Kennedy EM, 'A low energy pathway to CuCl2: A theoretical investigation', CHEMICAL PHYSICS LETTERS, 672 54-56 (2017) [C1]
|
|
Nova |
2017 |
Farhang F, Rayson M, Brent G, Hodgins T, Stockenhuber M, Kennedy E, 'Insights into the dissolution kinetics of thermally activated serpentine for CO
The rate-determining step in the aqueous carbonation of serpentine minerals is the dissolution of Mg from serpentine. The dissolution rate of minerals largely depends on the pH of... [more]
The rate-determining step in the aqueous carbonation of serpentine minerals is the dissolution of Mg from serpentine. The dissolution rate of minerals largely depends on the pH of the solution and the size of serpentine particles. In the present work, an experimental method has been developed to study the dissolution rate of heat activated serpentine (lizardite polymorph) in a wide range of pH, solid to liquid ratio and particle size at room temperature. The results allowed us to determine the effect of these variables on the dissolution kinetics of heat activated lizardite, which represents crucial kinetic data for accurately modelling the carbonation rates of serpentinite. Additionally, amorphous Si re-precipitation at high solid to liquid (S/L) ratio and pH 6.1 was demonstrated. These provide essential data for the design and optimisation of industrial mineral carbonation processes. For the first time, the crackling core model (CCM) was applied to model the dissolution kinetics of heat activated lizardite in acidic solutions. Applying the CCM model to a wide range of particle sizes provides useful information on the mechanism of the dissolution of heat activated lizardite and the range of particle size for which the assumptions of the model are valid. Characterising serpentine particles leached under different conditions, along with analysing model parameters, provided a new insight into the mechanism of the dissolution of heat activated lizardite.
|
|
Nova |
2016 |
Sanchez G, Dlugogorski BZ, Kennedy EM, Stockenhuber M, 'Zeolite-supported iron catalysts for allyl alcohol synthesis from glycerol', APPLIED CATALYSIS A-GENERAL, 509 130-142 (2016) [C1]
|
|
Nova |
2016 |
Gaikwad V, Kennedy E, Mackie J, Holdsworth C, Molloy S, Kundu S, et al., 'Reaction of dichloromethane under non-oxidative conditions in a dielectric barrier discharge reactor and characterisation of the resultant polymer', Chemical Engineering Journal, 290 499-506 (2016) [C1]
This paper presents the results of dichloromethane (DCM) decomposition to polymers utilising dielectric barrier discharge under non-oxidative reaction conditions. The conversion l... [more]
This paper presents the results of dichloromethane (DCM) decomposition to polymers utilising dielectric barrier discharge under non-oxidative reaction conditions. The conversion levels, mass balance, reaction mechanism and polymer characterisation in relation to DCM reaction are presented in this paper. Reaction pathways describing the decomposition of DCM and subsequent formation of the major products are outlined. Speculation of the mechanism of formation of CHCl3 and C2HCl3 are supported by quantum chemical calculations. In addition, the effect of introducing methane in the reaction feed on the conversion level of DCM and the polymer structure is also examined in this paper.
|
|
Nova |
2016 |
Stanger R, Tran QA, Xie W, Smith N, Lucas J, Yu J, et al., 'The use of LDI-TOF imaging mass spectroscopy to study heated coal with a temperature gradient incorporating the plastic layer and semi-coke', Fuel, 165 33-40 (2016) [C1]
This work has used high range imaging mass spectrometry to study a coal sample that has undergone heating with a temperature gradient. A custom made hotplate was heated to 1000°C ... [more]
This work has used high range imaging mass spectrometry to study a coal sample that has undergone heating with a temperature gradient. A custom made hotplate was heated to 1000°C and the coal was allowed to heat naturally through conduction to produce a large thermal gradient typical of conditions in a coke oven. The sample was quenched, sectioned and analysed using laser desorption time of flight imaging mass spectrometry (LDI-TOF-IMS) to study the molecular changes that occur within the plastic layer and in the semi-coke. The raw coal was observed to have a molecular weight range between 500 and 20,000 Da with a peak occurring at 2000 Da. The plastic layer was observed to have a prevalence for increasing 500-1000 Da structures though this formed part of the larger molecular weight range. Resolidification of the plastic layer coincided with a rise in 4000 Da structures. The semi-coke spectrum had a series of repeating peaks separated by 24 Da extending from 1000 Da to 3000 Da. This was considered evidence of broad molecular ordering. A second phenomenon was observed in the semi-coke associated with low range molecular weights (50-300 Da). This appeared as high intensity signals in a molecular range typically considered as ion fragments (being too low in size to remain in the high vacuum environment). It was speculated that these low range structures may be associated with the coking of volatile tars exiting the hot-side of the plastic layer through high temperature semi-coke. Overall, this preliminary work provides a novel methodology to study the heating impacts during coking on a molecular level.
|
|
Nova |
2016 |
Mosallanejad S, Dlugogorski BZ, Kennedy EM, Stockenhuber M, Lomnicki SM, Assaf NW, Altarawneh M, 'Formation of PCDD/Fs in Oxidation of 2-Chlorophenol on Neat Silica Surface', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 50 1412-1418 (2016) [C1]
|
|
Nova |
2016 |
Dharmarathne NK, Mackie JC, Kennedy EM, Stockenhuber M, 'Gas Phase Thermal Oxidation of Endosulfan and Formation of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans', ENVIRONMENTAL SCIENCE & TECHNOLOGY, 50 10106-10113 (2016) [C1]
|
|
Nova |
2016 |
Tran QA, Stanger R, Xie W, Lucas J, Yu J, Stockenhuber M, et al., 'Maceral separation from coal by the Reflux Classifier', FUEL PROCESSING TECHNOLOGY, 143 43-50 (2016) [C1]
|
|
Nova |
2016 |
Setiawan A, Friggieri J, Hosseiniamoli H, Kennedy EM, Dlugogorski BZ, Adesina AA, Stockenhuber M, 'Towards understanding the improved stability of palladium supported on TS-1 for catalytic combustion', Physical Chemistry Chemical Physics, 18 10528-10537 (2016) [C1]
A novel Pd supported on TS-1 combustion catalyst was synthesized and tested in methane combustion under very lean and under highly humid conditions (<1%). A notable increase in... [more]
A novel Pd supported on TS-1 combustion catalyst was synthesized and tested in methane combustion under very lean and under highly humid conditions (<1%). A notable increase in hydrothermal stability was observed over 1900 h time-on-stream experiments, where an almost constant, steady state activity obtaining 90% methane conversion was achieved below 500 °C. Surface oxygen mobility and coverage plays a major role in the activity and stability of the lean methane combustion in the presence of large excess of water vapour. We identified water adsorption and in turn the hydrophobicity of the catalyst support as the major factor influencing the long term stability of combustion catalysts. While Pd/Al2O3 catalyst shows a higher turn-over frequency than that of Pd/TS-1 catalyst, the situation reversed after ca. 1900 h on stream. Two linear regions, with different activation energies in the Arrhenius plot for the equilibrium Pd/TS-1 catalyst, were observed. The conclusions were supported by catalyst characterization using H2-chemisorption, TPD, XPS analyses as well as N2-adsorption-desorption, XRD, SEM, TEM. The hydrophobicity and competitive adsorption of water with oxygen is suggested to influence oxygen surface coverage and in turn the apparent activation energy for the oxidation reaction.
|
|
Nova |
2016 |
Farhang F, Oliver TK, Rayson M, Brent G, Stockenhuber M, Kennedy E, 'Experimental study on the precipitation of magnesite from thermally activated serpentine for CO2 sequestration', Chemical Engineering Journal, 303 439-449 (2016) [C1]
|
|
Nova |
2016 |
Sánchez G, Gaikwad V, Holdsworth C, Dlugogorski B, Kennedy E, Stockenhuber M, 'Catalytic conversion of glycerol to polymers in the presence of ammonia', Chemical Engineering Journal, 291 279-286 (2016) [C1]
In this contribution, the development of a process for the synthesis of potentially highly valuable polymeric products from the reaction of waste glycerol with ammonia is reported... [more]
In this contribution, the development of a process for the synthesis of potentially highly valuable polymeric products from the reaction of waste glycerol with ammonia is reported for the first time. The polymers were the result of a single step, continuous gas phase process, catalysed by an alumina-supported iron catalyst, operating under relatively mild reaction conditions. The solid product was characterised using 1D and 2D NMR spectroscopy, FTIR spectroscopy, qualitative chemical tests and elemental analysis. Characterisation revealed building blocks with unsaturated, amido and ester functionalities shaping a mixture of polymers. Nitrogen atoms were present in the main chain of the resultant polymers. NMR analyses of the polymer denotes the formation of structural defects such as unsaturation and branching; whilst the partial solubility of the polymer in solvents such as CDCl3 and THF is indicative of the formation of cross-linked structures. Insights into the mechanism of formation of these functional groups were based on the liquid and gas phase product distribution. Polymers with chain structures similar to those synthesised in this work are currently manufactured from fossil fuels and are widely used in biomedical applications not only because of their architecture but also due to their response to changes in pH and temperature.
|
|
Nova |
2015 |
Drewery M, Kennedy E, Alenazey F, Dlugogorski B, Stockenhuber M, 'The effect of synthesis gas composition on the performance of Ni-based solid oxide fuel cells', Chemical Engineering Research and Design, 101 22-26 (2015) [C1]
An increased interest in using hydrocarbons in solid oxide fuel cells for the production of power has led to research into operation on synthesis (syn) gas, a mixture of hydrogen ... [more]
An increased interest in using hydrocarbons in solid oxide fuel cells for the production of power has led to research into operation on synthesis (syn) gas, a mixture of hydrogen and carbon monoxide. Hydrocarbons are typically reformed, either internally or in an external reformer prior to the fuel cell, producing syngas with various H2:CO ratios depending on the hydrocarbon used. This paper examines the effect of varying the H2:CO ratio with respect to C1 to C4 steam reforming reactions and additionally a mixture containing a higher ratio of carbon monoxide. It was found that there was no significant relationship between cell performance and H2:CO ratio when a high feed rate was employed. For low flow rates, however, the high carbon monoxide concentration resulted in a significant decrease in cell performance. It was determined that this was caused by reversible carbon deposition as opposed to a decrease in carbon monoxide reactivity.
|
|
Nova |
2015 |
Setiawan A, Kennedy EM, Dlugogorski BZ, Adesina AA, Stockenhuber M, 'The stability of Co
Nano-sized Co3O4, Fe2O3, Au/Co3O4 and Au/Fe2O3 catalysts were prepared and evaluated for catalytic combustion of lean methane-air mixtures. Characteristics and catalytic activitie... [more]
Nano-sized Co3O4, Fe2O3, Au/Co3O4 and Au/Fe2O3 catalysts were prepared and evaluated for catalytic combustion of lean methane-air mixtures. Characteristics and catalytic activities under dry and wet feed conditions were investigated at gas hourly space velocities up to 100 000 h-1 mimicking the typical flow and conversion requirements of a catalytic system designed to treat a ventilation air methane stream. In order to gain a better understanding of the interaction between H2O and the catalyst surface, temperature-programmed desorption of water over fresh and used samples were studied, and supported by other catalyst characterization techniques such as N2-adsorption desorption, XRD, TEM, SEM and XPS analyses. The activity measurements of the catalysts studied identify Co3O4 as the most active material. Co-precipitating gold particles with cobalt oxide or iron oxide do not enhance the activity of the catalyst, which is most likely due to blocking the active site of support by the gold particle. The presence of strong hydroxyl bonds on the catalyst surface is substantiated by TPD and XPS analyses, and is suggested to be responsible for the rapid deactivation of Fe2O3 and Au/Fe2O3 catalysts.
|
|
Nova |
2015 |
Li JPH, Stockenhuber M, 'A temperature programmed desorption study of the interaction of ethyl cyanoacetate and benzaldehyde on metal oxide surfaces', Catalysis Today, 245 108-115 (2015) [C1]
© 2014 Elsevier B.V. All rights reserved. Reagents from a base catalysed condensation reaction (Knoevenagel condensation reaction between ethyl cyanoacetate and benzaldehyde), wer... [more]
© 2014 Elsevier B.V. All rights reserved. Reagents from a base catalysed condensation reaction (Knoevenagel condensation reaction between ethyl cyanoacetate and benzaldehyde), were adsorbed on ZnO and Al < inf > 2 < /inf > O < inf > 3 < /inf > catalyst surfaces and subject to temperature programmed desorption experiments, monitored using mass spectrometry. Ethyl formate, ketenimine species, carbon dioxide and carbon monoxide were desorption products from ethyl cyanoacetate, while benzene, carbon dioxide and carbon monoxide were desorbed from the catalysts loaded with benzaldehyde. The formation of the ketenimine species was confirmed by in situ FTIR experiments. The observation of the decomposition species further substantiates a proposed reaction mechanism for the Knoevenagel condensation reaction on the catalyst surface of some oxide catalysts.
|
|
Nova |
2015 |
Harvey L, Kennedy E, Dlugogorski BZ, Stockenhuber M, 'Influence of impurities on the epoxidation of allyl alcohol to glycidol with hydrogen peroxide over titanium silicate TS-1', APPLIED CATALYSIS A-GENERAL, 489 241-246 (2015) [C1]
|
|
Nova |
2015 |
Harvey L, Sánchez G, Kennedy EM, Stockenhuber M, 'Enhancing allyl alcohol selectivity in the catalytic conversion of glycerol; influence of product distribution on the subsequent epoxidation step', Asia-Pacific Journal of Chemical Engineering, 10 598-606 (2015) [C1]
|
|
Nova |
2015 |
Setiawan A, Friggieri J, Bryant G, Kennedy EM, Dlugogorski BZ, Stockenhuber M, 'Accelerated hydrothermal ageing of Pd/Al2O3 for catalytic combustion of ventilation air methane', Catalysis Science and Technology, 5 4008-4016 (2015) [C1]
|
|
Nova |
2014 |
Li JPH, Kennedy E, Stockenhuber M, 'Oxidative coupling and hydroxylation of phenol over transition metal and acidic zeolites: Insights into catalyst function', Catalysis Letters, 144 9-15 (2014) [C1]
Reaction of phenol with hydrogen peroxide over H-MFI, Fe-MFI, H-BEA, Fe-BEA and TS-1 zeolite catalysts was investigated. Over H-BEA, biphenyl product was observed. It is suggested... [more]
Reaction of phenol with hydrogen peroxide over H-MFI, Fe-MFI, H-BEA, Fe-BEA and TS-1 zeolite catalysts was investigated. Over H-BEA, biphenyl product was observed. It is suggested, that the larger pore size of H-BEA facilitates coupling of two phenol molecules. Two distinct reaction mechanisms are proposed for acid and redox catalysts. © 2013 Springer Science+Business Media New York.
|
|
Nova |
2014 |
Suleiman IA, Radny MW, Gladys MJ, Smith PV, Mackie JC, Stockenhuber M, et al., 'Water formation via HCl oxidation on Cu(100)', APPLIED SURFACE SCIENCE, 299 156-161 (2014) [C1]
|
|
Nova |
2014 |
Gaikwad V, Kennedy E, Mackie J, Holdsworth C, Molloy S, Kundu S, et al., 'Reaction of carbon tetrachloride with methane in a non-equilibrium plasma at atmospheric pressure, and characterisation of the polymer thus formed', Journal of Hazardous Materials, 280 38-45 (2014) [C1]
In this paper we focus on the development of a methodology for treatment of carbon tetrachloride utilising a non-equilibrium plasma operating at atmospheric pressure, which is not... [more]
In this paper we focus on the development of a methodology for treatment of carbon tetrachloride utilising a non-equilibrium plasma operating at atmospheric pressure, which is not singularly aimed at destroying carbon tetrachloride but rather at converting it to a non-hazardous, potentially valuable commodity. This method encompasses the reaction of carbon tetrachloride and methane, with argon as a carrier gas, in a quartz dielectric barrier discharge reactor. The reaction is performed under non-oxidative conditions. Possible pathways for formation of major products based on experimental results and supported by quantum chemical calculations are outlined in the paper. We elucidate important parameters such as carbon tetrachloride conversion, product distribution, mass balance and characterise the chlorinated polymer formed in the process. © 2014 Elsevier B.V.
|
|
Nova |
2014 |
Sánchez G, Friggieri J, Keast C, Drewery M, Dlugogorski BZ, Kennedy E, Stockenhuber M, 'The effect of catalyst modification on the conversion of glycerol to allyl alcohol', Applied Catalysis B: Environmental, 152-153 117-128 (2014) [C1]
Conversion of glycerol to allyl alcohol was carried out over an iron on alumina catalyst. With the aim of enhancing selectivity towards the desired product and to reduce acrolein ... [more]
Conversion of glycerol to allyl alcohol was carried out over an iron on alumina catalyst. With the aim of enhancing selectivity towards the desired product and to reduce acrolein formation (a detrimental impurity in the subsequent epoxidation of allyl alcohol) the supported iron catalyst was modified using alkali metals. It was found that lithium, sodium, potassium, rubidium and caesium deposition on the catalyst surface increased allyl alcohol yield and reduced the rate of catalyst deactivation. Coincidently, acrolein selectivity decreased by up to 75% following treatment with the alkali salt.Changes in the product distribution were determined to be associated with altering the acid/base properties of the catalyst, as confirmed by isopropanol dehydration/dehydrogenation, ammonia and carbon dioxide temperature programmed desorption. The treatment was also found to influence the physical properties of the catalyst surface. A correlation between acid to basic site concentration and allyl alcohol selectivity was established. A reduction in the former value results in an enhancement in the rate of allyl alcohol formation. A reaction mechanism was developed based on the effect of iron and alkali metals catalysing the conversion of glycerol into allyl alcohol. The proposed catalyst modification technique is a straightforward method, readily applicable at a larger scale due to the simplicity of the alkali inclusion and its striking influence on the reaction selectivity. © 2014.
|
|
Nova |
2014 |
Khan NA, Kennedy EM, Dlugogorski BZ, Adesina AA, Stockenhuber M, 'Partial oxidation of methane with nitrous oxide forms synthesis gas over cobalt exchanged ZSM-5', CATALYSIS COMMUNICATIONS, 53 42-46 (2014) [C1]
|
|
Nova |
2014 |
Setiawan A, Friggieri J, Kennedy EM, Dlugogorski BZ, Stockenhuber M, 'Catalytic combustion of ventilation air methane (VAM)-long term catalyst stability in the presence of water vapour and mine dust', Catalysis Science and Technology, 4 1793-1802 (2014) [C1]
In this paper, we report new insights into the deactivation phenomenon of palladium based catalysts for catalytic combustion of ventilation air methane (VAM). It was found that th... [more]
In this paper, we report new insights into the deactivation phenomenon of palladium based catalysts for catalytic combustion of ventilation air methane (VAM). It was found that the primary factor responsible for low temperature catalyst deactivation is the water vapour present in the feed stream. The influence of water vapour on VAM was examined by comparing the properties of fresh catalysts with catalysts following over 1000 h reaction time-on-stream. The techniques applied to characterize the catalysts included TPD, XRD, N 2-isotherm adsorption, H2-chemisorption and XPS analyses. Alternating between dry and water vapour-saturated VAM feed disclosed ca. 50% reversible drop in activity. XPS analysis suggests an absence of a palladium hydroxide phase during the initial 2 h on stream, although prolonged exposure to the reactant leads to the formation of palladium hydroxide, which appears to match the progressive deactivation of the Pd/Al2O3 catalyst. Introduction of VAM dust (a mixture of fine coal, CaCO3 and aluminosilicate particles) causes a variation in catalytic activity originating from coal-dust ignition and the effect of chloride on the surface of the catalyst. In the presence of these inhibiting agents, an average methane conversion of higher than 75% over 1100 h was achieved at reaction temperatures below 600°C. This journal is © the Partner Organisations 2014.
|
|
Nova |
2014 |
Sánchez G, Friggieri J, Adesina AA, Dlugogorski BZ, Kennedy EM, Stockenhuber M, 'Catalytic conversion of glycerol to allyl alcohol; Effect of a sacrificial reductant on the product yield', Catalysis Science and Technology, 4 3090-3098 (2014) [C1]
A continuous process for the conversion of glycerol to allyl alcohol, where ammonia or organic acids are added to the feed as sacrificial reductants, was investigated. Significant... [more]
A continuous process for the conversion of glycerol to allyl alcohol, where ammonia or organic acids are added to the feed as sacrificial reductants, was investigated. Significant enhancement on the rate of formation and yield of the allyl alcohol is observed with some of the reducing agents examined over an alumina-supported iron catalyst. Optimising the molar ratio of the reductant relative to feed glycerol results in an increase in the yield of allyl alcohol from 9% (in the absence of additives) to 11.3% with ammonia, 15.1% with ammonium hydroxide, 17.8% with oxalic acid and 19.5% with formic acid. Moreover, the addition of other organic acids, which are produced in a typical glycerol conversion experiment, was studied. However, acetic and propanoic acids had little effect on the rate of formation of allyl alcohol. Analysis of the product distribution in the liquid and gas phases when oxalic and formic acids were added suggests a two-step process for the formation of allyl alcohol under the operating conditions of the reaction; the initial step involves the dehydration of glycerol while the second comprises the reduction of the species produced in step one. © the Partner Organisations 2014.
|
|
Nova |
2014 |
Setiawan A, Kennedy EM, Dlugogorski BZ, Adesina AA, Tkachenko O, Stockenhuber M, 'Evidence of the Formation of Surface Palladium Carbide during the Catalytic Combustion of Lean Methane/Air Mixtures', ENERGY TECHNOLOGY, 2 243-249 (2014) [C1]
|
|
Nova |
2013 |
Mosallanejad S, Dlugogorski BZ, Kennedy EM, Stockenhuber M, 'HCl adsorption on copper-modified ZSM-5: FTIR and DFT study', Journal of Physical Chemistry C, 117 19365-19372 (2013) [C1]
The adsorption complex of hydrogen chloride on copper-modified ZSM-5 was studied by FTIR and theoretical calculations. The results indicate that the Cl atom of hydrogen chloride i... [more]
The adsorption complex of hydrogen chloride on copper-modified ZSM-5 was studied by FTIR and theoretical calculations. The results indicate that the Cl atom of hydrogen chloride is bound to the Cu cations when adsorbed at low pressures (<1 µbar). At higher pressures, HCl adsorbs on the zeolite Brønsted acid sites as well as is hydrogen bonded to the Cu in a larger cluster. Using in situ infrared spectroscopy, we observed a sharp decrease in stretching vibrational frequency of HCl of about 700 cm-1 compared with the H-Cl stretching vibration of gaseous hydrochloric acid. The findings were supported by density functional theory cluster quantum chemical calculations. © 2013 American Chemical Society.
|
|
Nova |
2013 |
Ahmad K, Mowla O, Kennedy EM, Dlugogorski BZ, Mackie JC, Stockenhuber M, 'A Melamine-Modified ß-Zeolite with Enhanced CO2 Capture Properties', Energy Technology, 1 345-349 (2013) [C1]
|
|
Nova |
2012 |
Brooks AC, France L, Gayot C, Li JPH, Sault R, Stafford A, et al., 'A designed organic-zeolite hybrid acid-base catalyst', Journal of Catalysis, 285 10-18 (2012) [C1]
|
|
Nova |
2009 |
Stockenhuber M, 'X-Ray Absorption Spectroscopy of Oxides and Oxidation Catalysts 299-321 (2009)
|
|
|
2009 |
Hargreaves JSJ, Howe RF, McKay D, Morrison E, Rico JL, Stockenhuber M, 'Nitridation of MoO3/HZSM-5 and Fe-MoO3/HZSM-5', Topics in Catalysis, 52 1559-1565 (2009) [C1]
|
|
Nova |
2009 |
Stockenhuber M, Allender CJ, Castell OK, Davies PR, Fiddy S, Hedin-Dahlstrom J, 'A glimpse of the inner workings of the templated site', Chemical Communications, - 165-167 (2009) [C1]
|
|
Nova |
2009 |
Mathisen K, Stockenhuber M, Nicholson DG, 'In situ XAS and IR studies on Cu:SAPO-5 and Cu:SAPO-11: The contributory role of monomeric linear copper(I) species in the selective catalytic reduction of NOx by propene', Physical Chemistry Chemical Physics, 11 5476-5488 (2009) [C1]
|
|
Nova |
2007 |
Burns S, Hargreaves JSJ, Stockenhuber M, Wells RPK, 'An al K-edge EXAFS study of MoO3/H-ZSM-5 catalyst precursors', MICROPOROUS AND MESOPOROUS MATERIALS, 104 97-102 (2007) [C1]
|
|
|
2007 |
Bonati MLM, Joyner RW, Stockenhuber M, 'On the mechanism of aromatic acylation over zeolites', MICROPOROUS AND MESOPOROUS MATERIALS, 104 217-224 (2007) [C1]
|
|
|
2007 |
Joyner RW, Sonntag O, Smith AD, Stockenhuber M, 'A soft X-ray EXAFS study of the variation of the local aluminium structure on adsorption of bases in various zeolite types', FROM ZEOLITES TO POROUS MOF MATERIALS: THE 40TH ANNIVERSARY OF INTERNATIONAL ZEOLITE CONFERENCE, PROCEEDINGS OF THE 15TH INTERNATIONAL ZEOLITE CONFERENCE, 170 756-761 (2007) [C1]
|
|
|
2006 |
Shiju NR, Fiddy S, Sonntag O, Stockenhuber M, Sankar G, 'Selective oxidation of benzene to phenol over FeAlPO catalysts using nitrous oxide as oxidant', CHEMICAL COMMUNICATIONS, 4955-4957 (2006) [C1]
|
|
|
2005 |
Mellor IM, Burrows A, Coluccia S, Hargreaves JSJ, Joyner RW, Kiely CJ, et al., 'Probing possible structure sensitivity in the exchange of isotopic oxygen with the surface of MgO', JOURNAL OF CATALYSIS, 234 14-23 (2005) [C1]
|
|
|
2005 |
Mathisen K, Nicholson DG, Fitch AN, Stockenhuber M, 'Selective catalytic reduction of NOx over microporous CuAPO-5: structural characterisation by XAS and XRD', JOURNAL OF MATERIALS CHEMISTRY, 15 204-217 (2005) [C1]
|
|
|
2005 |
Mathisen K, Nicholson DG, Stockenhuber M, 'The influence of silicon on the catalytic properties of CuSAPO-5 towards the selective reduction of NOx in the presence of propene', MICROPOROUS AND MESOPOROUS MATERIALS, 84 261-274 (2005) [C1]
|
|
|
2004 |
Hudson MJ, Jackson DB, Ward JL, Chinn MJ, Stockenhuber M, 'Peroxydisulfate in MCM-48 silicas: powerful and clean materials for the removal of toxic gases', JOURNAL OF MATERIALS CHEMISTRY, 14 1180-1186 (2004) [C1]
|
|
|
2004 |
Joyner RW, Smith AD, Stockenhuber M, van den Berg MWE, 'The local structure of aluminium sites in zeolites', PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 6 5435-5439 (2004) [C1]
|
|
|
2003 |
Mirzaei AA, Shaterian HR, Joyner RW, Stockenhuber M, Taylor SH, Hutchings GJ, 'Ambient temperature carbon monoxide oxidation using copper manganese oxide catalysts: Effect of residual Na+ acting as catalyst poison', CATALYSIS COMMUNICATIONS, 4 17-20 (2003) [C1]
|
|
|
2003 |
Bonati MLM, Joyner RW, Stockenhuber M, 'A temperature programmed desorption study of the interaction of acetic anhydride with zeolite beta (BEA)', CATALYSIS TODAY, 81 653-658 (2003) [C1]
|
|
|
2003 |
Joyner RW, Stockenhuber M, Tkachenko OP, 'Synthesis, structure, and reactivity of iron-sulfur species in zeolites', CATALYSIS LETTERS, 85 193-197 (2003) [C1]
|
|
|
2002 |
Grubert G, Stockenhuber M, Tkachenko OP, Wark M, 'Titanium oxide species in molecular sieves: Materials for the optical sensing of reductive gas atmospheres', CHEMISTRY OF MATERIALS, 14 2458-2466 (2002) [C1]
|
|
|
2001 |
Burton ID, Hargreaves JSJ, Nicholson DG, Nilsen MH, Stockenhuber M, 'An X-ray absorption study on copper-containing AlPO4-5 for selective catalytic reduction of NOX by propene', JOURNAL OF MATERIALS CHEMISTRY, 11 1441-1446 (2001)
|
|
|
2001 |
Stockenhuber M, Joyner RW, Dixon JM, Hudson MJ, Grubert G, 'Transition metal containing mesoporous silicas - redox properties, structure and catalytic activity', MICROPOROUS AND MESOPOROUS MATERIALS, 44 367-375 (2001)
|
|
|
2000 |
Grubert G, Hudson MJ, Joyner RW, Stockenhuber M, 'The room temperature, stoichiometric conversion of N2O to adsorbed NO by Fe-MCM-41 and Fe-ZSM-5', JOURNAL OF CATALYSIS, 196 126-133 (2000)
|
|
|
2000 |
Stockenhuber M, Hudson MJ, Joyner RW, 'Preparation, characterization, and unusual reactivity of Fe-MCM-41', JOURNAL OF PHYSICAL CHEMISTRY B, 104 3370-3374 (2000)
|
|
|
2000 |
Krylov AS, Poliakoff JF, Stockenhuber M, 'An Hermite expansion method for EXAFS data treatment and its application to FeK-edge spectra', PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2 5743-5749 (2000)
|
|
|
1999 |
Joyner R, Stockenhuber M, 'Preparation, characterization, and performance of Fe-ZSM-5 catalysts', JOURNAL OF PHYSICAL CHEMISTRY B, 103 5963-5976 (1999)
|
|
|
1998 |
Henson NJ, Cheetham AK, Stockenhuber M, Lercher JA, 'Modelling aromatics in siliceous zeolites: a new forcefield from thermochemical studies', JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 94 3759-3768 (1998)
|
|
|
1997 |
Eder F, Stockenhuber M, Lercher JA, 'Bronsted acid site and pore controlled siting of alkane sorption in acidic molecular sieves', JOURNAL OF PHYSICAL CHEMISTRY B, 101 5414-5419 (1997)
|
|
|
1997 |
Eder F, Stockenhuber M, Lercher JA, 'Brønsted acid site and pore controlled siting of alkane sorption in acidic molecular sieves', Journal of Physical Chemistry B, 101 5414-5419 (1997)
The sorption of alkanes in zeolites was investigated using calorimetry, gravimetry, and in situ infrared spectroscopy. At temperatures below 373 K alkanes are found to sorb locali... [more]
The sorption of alkanes in zeolites was investigated using calorimetry, gravimetry, and in situ infrared spectroscopy. At temperatures below 373 K alkanes are found to sorb localized on the strong Brønsted acid sites (bridging Si-OH-Al groups) of H-MFI, H-MOR, and H-FAU via hydrogen bonding of the dipole induced in the alkane and the hydroxyl group. Two n-alkanes, but only one isoalkane, simultaneously interact with the Brønsted acid sites of H-MFI. With the other zeolites only one alkane molecule is sorbed locally per strong Brønsted acid site. About one-third of these sites are accessible to alkanes in H-MOR and about 70% in H-FAU. The heat of sorption decreases in the sequence H-MFI > H-MOR > H-FAU. With increasing size of the hydrocarbon the heat of adsorption increases primarily due to an increase in the dispersion forces. The linear relationships between the enthalpies and the entropies of sorption suggest that the interaction is of similar nature for all hydrocarbons and characteristic for a particular zeolite.
|
|
|
1997 |
Connerton J, Joyner RW, Stockenhuber M, 'Activity of carbonaceous deposits in the selective reduction of nitrogen oxides', CHEMICAL COMMUNICATIONS, 185-186 (1997)
|
|
|
1997 |
Joyner RW, Stockenhuber M, 'Unusual structure and stability of iron-oxygen nano-clusters in Fe-ZSM-5 catalysts', CATALYSIS LETTERS, 45 15-19 (1997)
|
|
|
1996 |
Narbeshuber TF, Stockenhuber M, Brait A, Seshan K, Lercher JA, 'Hydrogen/deuterium exchange during n-butane conversion on H-ZSM-5', JOURNAL OF CATALYSIS, 160 183-189 (1996)
|
|
|
1995 |
STOCKENHUBER M, LERCHER JA, 'CHARACTERIZATION AND REMOVAL OF EXTRA LATTICE SPECIES IN FAUJASITES', MICROPOROUS MATERIALS, 3 457-465 (1995)
|
|
|
1995 |
Eder F, Stockenhuber M, Lercher JA, 'Sorption of light alkanes on H-ZSM5 and H-mordenite', ZEOLITES: A REFINED TOOL FOR DESIGNING CATALYTIC SITES, 97 495-500 (1995)
|
|
|
1994 |
Lercher JA, Mirth G, Stockenhuber M, Narbeshuber T, Kogelbauer A, 'Elementary Steps of Acid-Base Catalyzed Reactions in Molecular Sieves: Elementary Steps of Acid-Base Catalyzed Reactions in Molecular Sieves', Studies in Surface Science and Catalysis, 90 147-156 (1994)
The role of Brönsted acid (and basic) sites of molecular sieves is compared for four different acid-base catalyzed reactions, i.e., n-alkane conversion, isomenzation of xylene, re... [more]
The role of Brönsted acid (and basic) sites of molecular sieves is compared for four different acid-base catalyzed reactions, i.e., n-alkane conversion, isomenzation of xylene, reaction of methanol to dimethylether and alkylation of toluene. The coverage at the catalytically active sites and the surface chemistry during the reaction is followed by in situ i.r. spectroscopy using CSTR with i.r. light transparent windows. This allows to directly compare the surface chemistry with the catalytic activities and selectivities. Conventional isotope labelling and steady state isotope transient experiments are used to further support the mechanistic models of the acid-base catalyzed reactions outlined above. © 1994 Kodansha Ltd.
|
|
|
1993 |
STOCKENHUBER M, MAYER H, LERCHER JA, 'PREPARATION OF BARIUM TITANATES FROM OXALATES', JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 76 1185-1190 (1993)
|
|
|