Efficient stable catalysts for low temperature carbon monoxide oxidation

被引:190
作者
Xia, GG
Yin, YG
Willis, WS
Wang, JY
Suib, SL
机构
[1] Univ Connecticut, Dept Chem, Storrs, CT 06269 USA
[2] Univ Connecticut, Dept Chem Engn, Storrs, CT 06269 USA
[3] Univ Connecticut, Inst Mat Sci, Storrs, CT 06269 USA
关键词
CO oxidation; low temperature; octahedral molecular sieve (OMS); manganese oxide catalyst; average oxidation number; electron charge transfer;
D O I
10.1006/jcat.1999.2484
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
Octahedral molecular sieves (OMS), doped with Ag+, Co2+, and Cu2+, have been tested for their catalytic activity for carbon monoxide oxidation at low temperatures for long times on stream. Metal loaded OMS materials are highly active for this catalytic reaction and compare favorably with other catalysts such as Hopcalite-like CuMn2O4 catalysts, supported Ag catalysts, and supported noble-metal catalysts, especially with respect to resistance to deactivation in a long run. CO-doped OMS-2 has been tested for selective oxidation in the presence of a large surplus of hydrogen in the feed gas. This catalyst shows nearly exclusive oxidation of CO versus hydrogen with oxygen present in stoichiometric amounts with carbon monoxide. Its stability against reduction in CO or H-2 containing gas is demonstrated from comparisons of X-ray diffraction patterns and X-ray photoelectron spectra before and after exposure to these gases. Average oxidation numbers and populations of Mn valence states were determined for these catalysts. Catalytic activity of doped OMS catalysts toward CO oxidation shows a correlation among average oxidation number of Mn and the position and nature of the doped cation. The structure of the active sites and the mechanism of the reaction are proposed. (C) 1999 Academic Press.
引用
收藏
页码:91 / 105
页数:15
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