Shedding light on catalytic ignition: coverage changes during CO oxidation on Pd(110)

被引：17

作者：

Bowker, M

Jones, IZ

Bennett, RA

Esch, F

Baraldi, A

Lizzit, S

Comelli, G

机构：

[1] Univ Reading, Dept Chem, Reading RG6 6AD, Berks, England

[2] Sincrotrone Trieste, I-34012 Trieste, Italy

[3] Univ Trieste, Dipartmento Fis, I-34127 Trieste, Italy

来源：

CATALYSIS LETTERS | 1998年 / 51卷 / 3-4期

关键词：

carbon monoxide; light-off; molecular beam; oxygen; Pd(110); synchrotron radiation; XPS;

D O I：

10.1023/A:1019013807493

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：

Catalytic ignition or 'light-off' has been studied for a reaction of importance in automobile exhaust emissions, namely, CO oxidation over Pd, a metal which has become an important component of car catalysts. We present kinetic and spectroscopic studies to show that light-off is associated with a step change in surface composition of reactant as the surface is heated. Fast XPS using synchrotron radiation of high brightness reveals that the surface is dominated by CO at low temperature and the coverage suddenly switches during light-off to an oxygen-atom-dominated situation.

引用

收藏

页码：187 / 190

页数：4

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