Low-temperature CO oxidation over new types of Sn-Pt/SiO2 catalysts

被引：48

作者：

Margitfalvi, JL

Borbáth, I

Hegedus, M

Tfirst, E

Gobölös, S

Lázár, K

机构：

[1] Hungarian Acad Sci, Inst Chem, Chem Res Ctr, H-1025 Budapest, Hungary

[2] Hungarian Acad Sci, Inst Surface Sci & Catalysis, Chem Res Ctr, H-1525 Budapest, Hungary

来源：

JOURNAL OF CATALYSIS | 2000年 / 196卷 / 01期

基金：

匈牙利科学研究基金会;

关键词：

Sn-Pt/SiO2; catalysts; CO oxidation; low-temperature oxidation; Mossbauer spectroscopy; Sn4+-Pt ensemble sites;

D O I：

10.1006/jcat.2000.3022

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 sires 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. (C) 2000 Academic Press.

引用

页码：200 / 204

页数：5

共 21 条

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