Stability and deactivation of unconditioned Au/Tio2 catalysts during CO oxidation in a near-stoichiometric and O2-rich reaction atmosphere

被引：71
作者：
Denkwitz, Y.
Zhao, Z.
Hoermann, U.
Kaiser, U.
Plzak, V.
Behm, R. J. [1 ]
机构：
[1] Univ Ulm, Inst Catalysis & Surface Chem, D-89069 Ulm, Germany
[2] Univ Ulm, Ctr Facil Electron Microscopy, D-89069 Ulm, Germany
[3] Ctr Solar Energy & Hydrogen Res, D-89081 Ulm, Germany
来源：
JOURNAL OF CATALYSIS | 2007年 / 251卷 / 02期
关键词：
CO oxidation; conditioning; deactivation; gold catalysis;
D O I：
10.1016/j.jcat.2007.07.029
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：
The deactivation of unconditioned Au/TiO2 catalysts during CO oxidation at different reaction temperatures (30 and 80 degrees C) and in different reaction atmospheres was investigated. Kinetic and in situ IR spectroscopic measurements revealed a close correlation between the exponentially decreasing CO2 formation rate and the COad coverage (decreasing) and carbonate coverage (increasing) during deactivation, whereas transmission electronic microscopy imaging revealed no significant changes in Au particle size. Consequences for the deactivation mechanism are discussed. (C) 2007 Elsevier Inc. All rights reserved.
引用
收藏
页码：363 / 373
页数：11
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