Kinetic Study of H2 Oxidation in the Preferential Oxidation of CO on a Nanosized Au/CeO2 Catalyst

被引：15
|
作者：
Xu, Jing [1 ]
Li, Ping [1 ]
Song, Xingfu [1 ]
Qi, Zhiwen [1 ]
Yu, Jianguo [1 ]
Yuan, Weikang [1 ]
Han, Yi-Fan [1 ]
机构：
[1] E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China
来源：
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2010年 / 49卷 / 09期
关键词：
LOW-TEMPERATURE OXIDATION; SUPPORTED GOLD CATALYSTS; CARBON-MONOXIDE OXIDATION; GAS SHIFT REACTION; ROOM-TEMPERATURE; H-2-RICH GAS; ADSORPTION; TIO2; SURFACES; OXYGEN;
D O I：
10.1021/ie100325y
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Kinetic study of H-2 oxidation in the preferential oxidation (PROX) of CO was implemented over a nanosize Au/CeO2 catalyst in a temperature range 313-353 K. The Langmuir-Hinshelwood mechanism was proposed to be mainly responsible for H-2 oxidation, and CO oxidation can be accelerated by coadsorbed H at low temperatures. On the other hand, the water in the system has proved to suppress both CO and H-2 oxidation by increasing the energy bars. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) of CO adsorption on the Au surface indicates that linear CO-Au bond can be weakened in the presence of H-2; meanwhile, water can be a poison taking effects via the bonding of water and the lattice oxygen at the interface of Au/CeO2. The irreversible loss of activity during reaction may be caused by the reconstruction of Au particles, at least in part.
引用
收藏
页码：4149 / 4155
页数：7
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