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]
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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 1-16 (2020)
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. The aim of this study was to increase feedstock availability for mineral carbonation. Acid dissolution and carbonic acid ... [more]
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. The aim of this study was to increase feedstock availability for mineral carbonation. Acid dissolution and carbonic acid dissolution approaches were used to achieve higher Mg extractions from peridotites. Acid dissolution studies of raw dunite, heat-activated dunite, heat-transformed dunite, and twin sister dunite have not been reported in the literature. Heat-activated dunite is more reactive as compared to heat-transformed dunite, raw dunite, and twin sister dunite. The fraction of magnesium extracted from heat-activated dunite was 57% as compared to 18% from heat-transformed dunite, 14% from raw dunite, and 11% from twin sister dunite. Similarly, silicon and iron extractions were higher for heat-activated dunite compared to that of heat-transformed dunite, raw dunite, and twin sister dunite. Materials rich in forsterite (twin sister dunite and heat-transformed dunite) showed preferential Mg release and exhibited incongruent dissolution similar to that of forsterite. Heat-activated dunite (amorphous magnesium silicate rich) on the other hand behaved differently and showed congruent dissolution. Olivine did not dissolve under carbonic acid dissolution (with concurrent grinding) and acidic conditions. Under carbonic acid dissolution with concurrent grinding conditions, olivine was partially converted into nanometer sized particles (d10 = 0.08 µm) but still provided 16% Mg extraction during 4 h of dissolution.
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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]
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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]
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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
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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]
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2020 |
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
© 2020 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 behav... [more]
© 2020 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.
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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]
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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]
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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]
© The Royal Society of Chemistry. Chlorpyrifos (CPF) is a widely used pesticide; however, limited experimental work has been completed on its thermal decomposition. CPF is known t... [more]
© The Royal Society of Chemistry. 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.
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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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)
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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2018 |
Stockenhuber M, 'Catalysis Society of Australia', ChemCatChem, 10 1481-1482 (2018)
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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]
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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]
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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]
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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]
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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]
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2018 |
Stockenhuber M, 'Preface: Environmental (ICEC)', CATALYSIS TODAY, 307 1-1 (2018)
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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2017 |
Suleiman IA, Stockenhuber M, Kennedy EM, 'A low energy pathway to CuCl2: A theoretical investigation', CHEMICAL PHYSICS LETTERS, 672 54-56 (2017) [C1]
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2017 |
Farhang F, Rayson M, Brent G, Hodgins T, Stockenhuber M, Kennedy E, 'Insights into the dissolution kinetics of thermally activated serpentine for CO
© 2017 Elsevier B.V. The rate-determining step in the aqueous carbonation of serpentine minerals is the dissolution of Mg from serpentine. The dissolution rate of minerals largely... [more]
© 2017 Elsevier B.V. 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.
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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]
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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]
© 2016 Elsevier B.V. This paper presents the results of dichloromethane (DCM) decomposition to polymers utilising dielectric barrier discharge under non-oxidative reaction conditi... [more]
© 2016 Elsevier B.V. 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.
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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]
© 2015 Elsevier Ltd. 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 ... [more]
© 2015 Elsevier Ltd. 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.
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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]
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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]
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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]
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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]
© the Owner Societies 2016. A novel Pd supported on TS-1 combustion catalyst was synthesized and tested in methane combustion under very lean and under highly humid conditions (&l... [more]
© the Owner Societies 2016. 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.
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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]
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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]
© 2016 Elsevier B.V. In this contribution, the development of a process for the synthesis of potentially highly valuable polymeric products from the reaction of waste glycerol wit... [more]
© 2016 Elsevier B.V. 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.
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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]
© 2015 The Institution of Chemical Engineers. An increased interest in using hydrocarbons in solid oxide fuel cells for the production of power has led to research into operation ... [more]
© 2015 The Institution of Chemical Engineers. 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 H<inf>2</inf>:CO ratios depending on the hydrocarbon used. This paper examines the effect of varying the H<inf>2</inf>:CO ratio with respect to C<inf>1</inf> to C<inf>4</inf> 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 H<inf>2</inf>: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.
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2015 |
Setiawan A, Kennedy EM, Dlugogorski BZ, Adesina AA, Stockenhuber M, 'The stability of Co
© 2014 Elsevier B.V. All rights reserved. Nano-sized Co3O4, Fe2O3, Au/Co3O4 and Au/Fe2O3 catalysts were prepared and evaluated for catalytic combustion of lean methane-air mixture... [more]
© 2014 Elsevier B.V. All rights reserved. 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.
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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.
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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]
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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, n/a-n/a (2015) [C1]
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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]
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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.
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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]
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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.
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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.
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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]
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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.
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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.
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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]
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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.
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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]
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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]
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2009 |
Stockenhuber M, 'X-Ray Absorption Spectroscopy of Oxides and Oxidation Catalysts 299-321 (2009)
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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]
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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]
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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]
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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]
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2007 |
Bonati MLM, Joyner RW, Stockenhuber M, 'On the mechanism of aromatic acylation over zeolites', MICROPOROUS AND MESOPOROUS MATERIALS, 104 217-224 (2007) [C1]
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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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]
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2003 |
Joyner RW, Stockenhuber M, Tkachenko OP, 'Synthesis, structure, and reactivity of iron-sulfur species in zeolites', CATALYSIS LETTERS, 85 193-197 (2003) [C1]
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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]
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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)
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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)
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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)
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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)
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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)
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1999 |
Joyner R, Stockenhuber M, 'Preparation, characterization, and performance of Fe-ZSM-5 catalysts', JOURNAL OF PHYSICAL CHEMISTRY B, 103 5963-5976 (1999)
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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)
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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)
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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.
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1997 |
Connerton J, Joyner RW, Stockenhuber M, 'Activity of carbonaceous deposits in the selective reduction of nitrogen oxides', CHEMICAL COMMUNICATIONS, 185-186 (1997)
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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)
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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)
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1995 |
STOCKENHUBER M, LERCHER JA, 'CHARACTERIZATION AND REMOVAL OF EXTRA LATTICE SPECIES IN FAUJASITES', MICROPOROUS MATERIALS, 3 457-465 (1995)
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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)
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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.
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1993 |
STOCKENHUBER M, MAYER H, LERCHER JA, 'PREPARATION OF BARIUM TITANATES FROM OXALATES', JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 76 1185-1190 (1993)
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