CO oxidation on Pd/CeO2-ZrO2 catalysts

被引：141

作者：

Bekyarova, E ^{[1
]}

Fornasiero, P ^{[1
]}

Kaspar, J ^{[1
]}

Graziani, M ^{[1
]}

机构：

[1] Univ Trieste, Dipartimento Sci Chim, I-34127 Trieste, Italy

来源：

CATALYSIS TODAY | 1998年 / 45卷 / 1-4期

关键词：

CO oxidation; CeO2-ZrO2 solid solution; redox properties;

D O I：

10.1016/S0920-5861(98)00212-0

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The promotive effects of cerium oxide on commercial three-way catalysts (TWCs) for purification of motor exhaust gases have been widely investigated in recent years. This work shows the cooperative effects of CeO2-Pd on the kinetics of CO oxidation over Pd/CeO2-ZrO2. Under reducing-to-moderately oxidizing conditions, a zero-order O-2 pressure dependence is found which can be interpreted on the basis of a mechanism involving a reaction between CO adsorbed on Pd and surface oxygen from the support. The high oxygen-exchange capability of the CeO2-ZrO2 support, as determined from temperature programmed reduction/oxygen uptake measurements is suggested as being responsible for such a catalytic behavior. (C) 1998 Elsevier Science B.V. All rights reserved.

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收藏

页码：179 / 183

页数：5

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