Poisoning of the adsorption of CO, O2 and D2 on Pt(111) by preadsorbed H2O

被引：21

作者：

Lofgren, P

Kasemo, B ^{[1
]}

机构：

[1] Chalmers Univ Technol, Dept Appl Phys, S-41296 Gothenburg, Sweden

[2] Gothenburg Univ, S-41296 Gothenburg, Sweden

来源：

CATALYSIS LETTERS | 1998年 / 53卷 / 1-2期

关键词：

poisoning; water; CO; D-2; O-2; saturation coverage; sticking coefficient;

D O I：

10.1023/A:1019025032025

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 measured the influence of adsorbed H2O on the sticking coefficients and saturation coverages of CO, O-2 and D-2 on Pt(111). at similar to 100 K. Strong poisoning is observed for all three gases. For O-2 and D-2, the surface is essentially totally poisoned at 1 monolayer (ML) water coverage. For CO, the effect is weaker, with some CO adsorption still occurring at 2-3 ML H2O. The influence of these results on the kinetics of the CO and H-2 oxidation reactions are discussed briefly It is concluded that the influence of water must be included in kinetics simulations, at least at low temperatures, when significant humidity levels are present in inlet gas mixtures, or produced by the reactions themselves.

引用

页码：33 / 36

页数：4

共 7 条

[1] ADSORPTION OF HYDROGEN ON A PT(111) SURFACE [J].