A calorimetric study of oxygen-storage in Pd/ceria and Pd/ceria–zirconia catalysts

被引：0
作者：
L. Yang
O. Kresnawahjuesa
R.J. Gorte
机构：
[1] University of Pennsylvania,Department of Chemical Engineering
来源：
Catalysis Letters | 2001年 / 72卷
关键词：
oxygen storage; three-way catalysts; O; adsorption; calorimetry; Pd; ceria; ceria–zirconia;
D O I：
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摘要：
Heats of adsorption were measured calorimetrically for O2 adsorption on reduced Pd/alumina, Pd/ceria, and Pd/ceria–zirconia catalysts, all with 1 wt% Pd. Significantly more O2 adsorbed on the ceria-containing catalysts due to oxidation of the support. For Pd/alumina, the heats were found to be between 180 and 220 kJ/mol, only slightly higher in magnitude than the heat of reaction for bulk oxidation of Pd. However, the heats of adsorption for both ceria and ceria–zirconia were also ∼200 kJ/mol, much lower than the heat of reaction for Ce2O3 oxidation to CeO2, but in reasonable agreement with estimates from O2 desorption studies on model ceria films. The implications of these results for understanding oxygen-storage properties on ceria-based catalysts are discussed.
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页码：33 / 37
页数：4
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