Evidence for oxidation of ceria by CO2

被引：174
|
作者：
Sharma, S
Hilaire, S
Vohs, JM
Gorte, RJ [1 ]
Jen, HW
机构：
[1] Univ Penn, Dept Chem Engn, Philadelphia, PA 19104 USA
[2] Ford Motor Co, Chem & Phys Sci Lab, Dearborn, MI 48121 USA
来源：
JOURNAL OF CATALYSIS | 2000年 / 190卷 / 01期
关键词：
oxygen storage capacity; ceria; zirconia; Pd; temperature-programmed desorption; CO oxidation; CO2 reforming of methane;
D O I：
10.1006/jcat.1999.2746
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 oxidation and reduction of Pd/ceria and Pd/zirconia catalysts were investigated using pulse-reactor studies in which products were monitored following step changes in the reactant composition. The results demonstrate that both ceria and zirconia can be partially reduced by CO and partially reoxidized by CO2. Steady-state rates for methane reforming by CO2 were also measured on Pd/ceria, Pd/zirconia, and Pd/silica. The Pd/ceria catalyst was slightly more active than Pd/zirconia and similar to 10(4) times as active as Pd/silica. The high activities of Pd/ceria and Pd/zirconia are explained as resulting from oxidation and reduction of the supports. (C) 2000 Academic Press.
引用
收藏
页码：199 / 204
页数：6
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