Stability and deactivation of unconditioned Au/Tio2 catalysts during CO oxidation in a near-stoichiometric and O2-rich reaction atmosphere
Stability and deactivation of unconditioned Au/Tio2 catalysts during CO oxidation in a near-stoichiometric and O2-rich reaction atmosphere
复制标题
DOI：
10.1016/j.jcat.2007.07.029
复制
发表时间：
2007-10-25
影响因子：
7.3
通讯作者：
Behm, R. J.
中科院分区：
文献类型：
--
作者：
Denkwitz, Y.;Zhao, Z.;Behm, R. J.
研究了在不同反应温度（30和80 ℃）和不同反应气氛下CO氧化过程中未调质的Au/TiO 2催化剂的失活。动力学和原位红外光谱测量结果显示，指数下降的CO2形成速率和COad覆盖率（减少）和碳酸盐覆盖率（增加）在失活过程中的密切相关性，而透射电子显微镜成像显示Au颗粒大小没有显着变化。失活机制的后果进行了讨论。(C)2007年爱思唯尔公司All rights reserved.
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.