Pd-Ce interactions and adsorption properties of palladium:: CO and NO TPD studies over Pd-Ce/Al2O3 catalysts

被引：78

作者：

Ciuparu, D ^{[1
]}

Bensalem, A ^{[1
]}

Pfefferle, L ^{[1
]}

机构：

[1] Yale Univ, Dept Chem Engn, New Haven, CT 06520 USA

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2000年 / 26卷 / 04期

关键词：

palladium; ceria; Pd-Ce interaction; CO; NO; TPD;

D O I：

10.1016/S0926-3373(00)00130-2

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：

We have examined the adsorption of CO and NO on powder Pd/Al2O3, Pd-Ce/Al2O3 and CeO2/Al2O3 catalysts, using temperature-programmed desorption (TPD). For CO adsorption on oxidized and pre-reduced Pd-Ce/Al2O3 TPD profiles are identical to those observed for Pd/Al2O3, suggesting that interactions between ceria and Pd have a negligible effect on the adsorption properties of CO. It does, however, affect the oxidation state of the palladium particles. For NO, there are differences between Pd/Al2O3 and Pd-Ce/Al2O3. On oxidized catalysts, Pd/Al2O3 is more efficient for NO dissociation. However, pre-reduction increases the amount of NO that can adsorb on Pd-Ce/Al2O3 and react to N2O and N-2. In comparison with Pd/Al2O3, reduced Pd-Ce/Al2O3 catalysts dissociate NO at relatively high temperatures but they are more reactive and favor N-2 over N2O. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：241 / 255

页数：15

共 42 条

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