Noble metal catalysts for the preferential oxidation of carbon monoxide in the presence of hydrogen (PROX)

Oxide-supported noble metal catalysts were tested in the preferential oxidation of carbon monoxide (PROX) reaction in the temperature range between 50 and 300°C. Both the influence of the noble metal nature (Pt, Ir, Pd), the support physical and chemical properties (redox, acidity, basicity) and the...

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Detalles Bibliográficos
Autores principales: Mariño, F., Descorme, C., Duprez, D.
Formato: JOUR
Materias:
Acido-basicity
Fuel cells
hydrogen purification
Iridium
Noble metals
Oxygen mobility
Palladium
Platinum
Preferential oxidation of CO
PROX
Redox
Supported catalysts
WGSR
Carbon monoxide
Catalysts
Low temperature effects
Magnesia
Oxidation
Precious metals
Stoichiometry
Gas shifts
Molar fraction
Oxygen atoms
Catalysis
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09263373_v54_n1_p59_Marino
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_09263373_v54_n1_p59_Marino
record_format dspace
spelling todo:paper_09263373_v54_n1_p59_Marino2023-10-03T15:46:35Z Noble metal catalysts for the preferential oxidation of carbon monoxide in the presence of hydrogen (PROX) Mariño, F. Descorme, C. Duprez, D. Acido-basicity Fuel cells hydrogen purification Iridium Noble metals Oxygen mobility Palladium Platinum Preferential oxidation of CO PROX Redox Supported catalysts WGSR Carbon monoxide Catalysts Low temperature effects Magnesia Oxidation Precious metals Stoichiometry Gas shifts Molar fraction Oxygen atoms Catalysis Oxide-supported noble metal catalysts were tested in the preferential oxidation of carbon monoxide (PROX) reaction in the temperature range between 50 and 300°C. Both the influence of the noble metal nature (Pt, Ir, Pd), the support physical and chemical properties (redox, acidity, basicity) and the reaction conditions (oxygen stoichiometry) on the catalyst activity and selectivity was evaluated. Platinum and iridium were shown to be the most active and selective catalysts in the whole temperature range compared with palladium. Furthermore, noble metals supported over ceria-based oxides were shown to be active and selective, especially at low temperature. Additionally, it was observed that the higher the molar fraction in ceria in the oxide, the higher the activity and the selectivity in the PROX reaction. Ceria, with the highest oxygen mobility at the oxide surface, was shown to be the best support. Accordingly, on simple oxides (CeO2, SiO2-Al 2O3, Al2O3, SiO2, La 2O3 and MgO), the induced mobility of the oxygen atoms at the surface of the support determined elsewhere, well correlated with the basicity of the support, was shown to be one key parameter for the performances of the catalysts in the PROX reaction. Finally, the formation of water (hydrogen oxidation) at high temperature and high oxygen excess was shown to be responsible for the increasing activity of the catalysts in the conversion of CO to CO2 via the water gas shift reaction (WGSR). © 2004 Elsevier B.V. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09263373_v54_n1_p59_Marino
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Acido-basicity
Fuel cells
hydrogen purification
Iridium
Noble metals
Oxygen mobility
Palladium
Platinum
Preferential oxidation of CO
PROX
Redox
Supported catalysts
WGSR
Carbon monoxide
Catalysts
Low temperature effects
Magnesia
Oxidation
Precious metals
Stoichiometry
Gas shifts
Molar fraction
Oxygen atoms
Catalysis
spellingShingle Acido-basicity
Fuel cells
hydrogen purification
Iridium
Noble metals
Oxygen mobility
Palladium
Platinum
Preferential oxidation of CO
PROX
Redox
Supported catalysts
WGSR
Carbon monoxide
Catalysts
Low temperature effects
Magnesia
Oxidation
Precious metals
Stoichiometry
Gas shifts
Molar fraction
Oxygen atoms
Catalysis
Mariño, F.
Descorme, C.
Duprez, D.
Noble metal catalysts for the preferential oxidation of carbon monoxide in the presence of hydrogen (PROX)
topic_facet Acido-basicity
Fuel cells
hydrogen purification
Iridium
Noble metals
Oxygen mobility
Palladium
Platinum
Preferential oxidation of CO
PROX
Redox
Supported catalysts
WGSR
Carbon monoxide
Catalysts
Low temperature effects
Magnesia
Oxidation
Precious metals
Stoichiometry
Gas shifts
Molar fraction
Oxygen atoms
Catalysis
description Oxide-supported noble metal catalysts were tested in the preferential oxidation of carbon monoxide (PROX) reaction in the temperature range between 50 and 300°C. Both the influence of the noble metal nature (Pt, Ir, Pd), the support physical and chemical properties (redox, acidity, basicity) and the reaction conditions (oxygen stoichiometry) on the catalyst activity and selectivity was evaluated. Platinum and iridium were shown to be the most active and selective catalysts in the whole temperature range compared with palladium. Furthermore, noble metals supported over ceria-based oxides were shown to be active and selective, especially at low temperature. Additionally, it was observed that the higher the molar fraction in ceria in the oxide, the higher the activity and the selectivity in the PROX reaction. Ceria, with the highest oxygen mobility at the oxide surface, was shown to be the best support. Accordingly, on simple oxides (CeO2, SiO2-Al 2O3, Al2O3, SiO2, La 2O3 and MgO), the induced mobility of the oxygen atoms at the surface of the support determined elsewhere, well correlated with the basicity of the support, was shown to be one key parameter for the performances of the catalysts in the PROX reaction. Finally, the formation of water (hydrogen oxidation) at high temperature and high oxygen excess was shown to be responsible for the increasing activity of the catalysts in the conversion of CO to CO2 via the water gas shift reaction (WGSR). © 2004 Elsevier B.V. All rights reserved.
format JOUR
author Mariño, F.
Descorme, C.
Duprez, D.
author_facet Mariño, F.
Descorme, C.
Duprez, D.
author_sort Mariño, F.
title Noble metal catalysts for the preferential oxidation of carbon monoxide in the presence of hydrogen (PROX)
title_short Noble metal catalysts for the preferential oxidation of carbon monoxide in the presence of hydrogen (PROX)
title_full Noble metal catalysts for the preferential oxidation of carbon monoxide in the presence of hydrogen (PROX)
title_fullStr Noble metal catalysts for the preferential oxidation of carbon monoxide in the presence of hydrogen (PROX)
title_full_unstemmed Noble metal catalysts for the preferential oxidation of carbon monoxide in the presence of hydrogen (PROX)
title_sort noble metal catalysts for the preferential oxidation of carbon monoxide in the presence of hydrogen (prox)
url http://hdl.handle.net/20.500.12110/paper_09263373_v54_n1_p59_Marino
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