Low-Temperature CO Oxidation over New Types of Sn–Pt/SiO2 Catalysts

Sn–Pt/SiO2 catalysts prepared by using controlled surface reactions are highly active in the low-temperature oxidation of CO. The results indicate that the high activity of these catalysts can be attributed to (i) the stabilization of tin–platinum alloy phases on the silica support, and (ii) the for...

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Bibliographic Details
Published in:Journal of catalysis 2000-11, Vol.196 (1), p.200-204
Main Authors: Margitfalvi, J.L., Borbáth, I., Hegedűs, M., Tfirst, E., Gőbölös, S., Lázár, K.
Format: Article
Language:English
Subjects:
Catalysis
Catalysts: preparations and properties
Chemistry
CO oxidation
Exact sciences and technology
General and physical chemistry
low-temperature oxidation
Mössbauer spectroscopy
Sn4+–Pt ensemble sites
Sn–Pt/SiO2 catalysts
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:Sn–Pt/SiO2 catalysts prepared by using controlled surface reactions are highly active in the low-temperature oxidation of CO. The results indicate that the high activity of these catalysts can be attributed to (i) the stabilization of tin–platinum alloy phases on the silica support, and (ii) the formation of “Sn4+–Pt” ensemble sites during the oxidation of CO. It is suggested that Sn4+ species formed in situ are involved in the activation of the CO molecule adsorbed at the neighboring Pt site. This activation strongly resembles that of the carbonyl group in unsaturated aldehydes over this type of Sn–Pt/SiO2 catalysts.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.2000.3022