Real time measurements of hydrogen desorption and absorption during CO exposures of Pd: hydrogen sticking and dissolution

被引：33

作者：

Eriksson, M ^{[1
]}

Ekedahl, LG ^{[1
]}

机构：

[1] Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden

来源：

APPLIED SURFACE SCIENCE | 1998年 / 133卷 / 1-2期

关键词：

adsorption kinetics; palladium; hydrogen; carbon monoxide; polycrystalline thin films; metal-insulator interfaces;

D O I：

10.1016/S0169-4332(98)00185-8

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：

Combined real time measurements of hydrogen desorption and absorption show that both processes may be induced simultaneously by CO adsorption on a hydrogen-covered Pd surface. The induced absorption is found to be a kinetic effect, where the amount absorbed depends on the hydrogen desorption rate and the CO adsorption rate. In addition to simple site blocking, adsorbed CO induces an increase in the hydrogen desorption energy and an activation barrier for hydrogen dissociation. Both increase linearly with CO coverage for theta(CO) > 0.18 ML. Below this coverage, the hydrogen dissociation is non-activated. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：89 / 97

页数：9

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