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Abstract:

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.

Registro:

Documento: Artículo
Título:Noble metal catalysts for the preferential oxidation of carbon monoxide in the presence of hydrogen (PROX)
Autor:Mariño, F.; Descorme, C.; Duprez, D.
Filiación:LACCO-UMR 6503, CNRS-Université de Poitiers, 40 Ave. Recteur Pineau, F-86022 C., Poitiers, France
Lab. de Procesos Catalíticos, DIQ-FIUBA, Univ. Buenos Aires, Pabellon I., Buenos Aires, Argentina
Inst. de Recherches Sur la Catalyse, CNRS, 2 Ave. Albert Einstein, F-69626 C., Villeurbanne, France
Palabras clave: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
Año:2004
Volumen:54
Número:1
Página de inicio:59
Página de fin:66
DOI: http://dx.doi.org/10.1016/j.apcatb.2004.06.008
Título revista:Applied Catalysis B: Environmental
Título revista abreviado:Appl. Catal. B Environ.
ISSN:09263373
CODEN:ACBEE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09263373_v54_n1_p59_Marino

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Citas:

---------- APA ----------
Mariño, F., Descorme, C. & Duprez, D. (2004) . Noble metal catalysts for the preferential oxidation of carbon monoxide in the presence of hydrogen (PROX). Applied Catalysis B: Environmental, 54(1), 59-66.
http://dx.doi.org/10.1016/j.apcatb.2004.06.008
---------- CHICAGO ----------
Mariño, F., Descorme, C., Duprez, D. "Noble metal catalysts for the preferential oxidation of carbon monoxide in the presence of hydrogen (PROX)" . Applied Catalysis B: Environmental 54, no. 1 (2004) : 59-66.
http://dx.doi.org/10.1016/j.apcatb.2004.06.008
---------- MLA ----------
Mariño, F., Descorme, C., Duprez, D. "Noble metal catalysts for the preferential oxidation of carbon monoxide in the presence of hydrogen (PROX)" . Applied Catalysis B: Environmental, vol. 54, no. 1, 2004, pp. 59-66.
http://dx.doi.org/10.1016/j.apcatb.2004.06.008
---------- VANCOUVER ----------
Mariño, F., Descorme, C., Duprez, D. Noble metal catalysts for the preferential oxidation of carbon monoxide in the presence of hydrogen (PROX). Appl. Catal. B Environ. 2004;54(1):59-66.
http://dx.doi.org/10.1016/j.apcatb.2004.06.008