Positive Effect of Water Vapor on CO Oxidation at Low Temperature over Pd/CeO2-TiO2 Catalyst

被引：23
作者：
Liang, Feixue [1 ,2 ]
Zhu, Huaqing [1 ]
Qin, Zhangfeng [1 ]
Wang, Hui [1 ,2 ]
Wang, Guofu [1 ]
Wang, Jianguo [1 ]
机构：
[1] Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Shanxi, Peoples R China
[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
来源：
CATALYSIS LETTERS | 2008年 / 126卷 / 3-4期
关键词：
Carbon monoxide oxidation; Low temperature; Pd/CeO2-TiO2; Water vapor; DRIFTS; TPReaction;
D O I：
10.1007/s10562-008-9630-2
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：
CO oxidation at low temperature over Pd/CeO2-TiO2 catalyst was carried out in the feed containing different contents of water vapor (H2O). A positive effect of H2O was observed on the catalytic performance of Pd/CeO2-TiO2 in CO oxidation at low temperature. The extent of this effect depends on the content of H2O in the feed; with a H2O content being 2.5 vol%, the catalyst Pd/CeO2-TiO2 exhibits the highest stability (longest life time for CO oxidation at 80 C). The results of in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and temperature-programmed reaction (TPReaction) reaction illustrated that H2O in the feed supplies sufficient OH groups in the presence of O-2, which can react with adsorbed CO on Pd species to produce CO2. Moreover, H2O may also enhance the adsorption of CO and suppress the formation of some carbonate species.
引用
收藏
页码：353 / 360
页数：8
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