The role of long-lived oxygen precursors on AuM alloys (M = Ni, Pd, Pt) in CO oxidation

Gold alloys have been reported to be active in very low temperature oxidation of CO. The reasons for the better performance of AuNi with respect to Ni(111) surfaces were reported recently by indicating an active role of gold. Our results show that for this alloy, the CO oxidation molecular channel i...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2011-04, Vol.13 (13), p.5790-5797
Main Authors: GARCIA-MOTA, Mónica, LOPEZ, Núria
Format: Article
Language:English
Subjects:
Alloys
Carbon monoxide
Catalysis
Catalysts
Channels
Chemistry
Exact sciences and technology
General and physical chemistry
Gold base alloys
Oxidation
Surface chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:Gold alloys have been reported to be active in very low temperature oxidation of CO. The reasons for the better performance of AuNi with respect to Ni(111) surfaces were reported recently by indicating an active role of gold. Our results show that for this alloy, the CO oxidation molecular channel is responsible for the low temperature performance but the remaining oxygen on the surface is tightly bound and the process is not catalytic at low to room temperatures. The contribution from the associative path is also improved for the rest of the series: AuPd and AuPt. Only in the latter case, an important reduction of the light-off temperature of the catalytic path is observed.
ISSN:1463-9076
1463-9084
DOI:10.1039/c0cp01895c