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

被引：32

作者：

Yang, L ^{[1
]}

Kresnawahjuesa, O ^{[1
]}

Gorte, RJ ^{[1
]}

机构：

[1] Univ Penn, Dept Chem Engn, Philadelphia, PA 19104 USA

来源：

CATALYSIS LETTERS | 2001年 / 72卷 / 1-2期

关键词：

oxygen storage; three-way catalysts; O-2; adsorption; calorimetry; Pd; ceria; ceria-zirconia;

D O I：

10.1023/A:1009012610200

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：

Heats of adsorption were measured calorimetrically for O-2 adsorption on reduced Pd/alumina, Pd/ceria, and Pd/ceria-zirconia catalysts, all with 1 wt% Pd. Significantly more O-2 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 similar to 200 kJ/mol, much lower than the heat of reaction for Ce2O3 oxidation to CeO2, but in reasonable agreement with estimates from O-2 desorption studies on model ceria films. The implications of these results for understanding oxygen-storage properties on ceria-based catalysts are discussed.

引用

页码：33 / 37

页数：5

共 46 条

[1] Surface and reduction energetics of the CeO2-ZrO2 catalysts [J].