Kinetic study of CO oxidation on copper modified Pt(111)

被引:17
作者
Colen, RER
Kolodziejczyk, M
Delmon, B
Block, JH
机构
[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany
[2] Univ Catholique Louvain, Unite Catalyse & Chim Mat Divises, B-1348 Louvain, Belgium
关键词
carbon monoxide; copper; low index single crystal surfaces; metallic films; oxidation; oxygen; photoemission electron microscopy; platinum;
D O I
10.1016/S0039-6028(98)00465-8
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
The kinetics of CO oxidation on Pt(111) modified with submonolayer copper adlayers were studied using mass spectrometry (MS) and photoemission electron microscopy (PEEM). The submonolayer 2D copper adlayers were formed on approximately half of the Pt(111) crystal, by evaporating copper through a mask. More precisely, the article deals with the modifications of the hysteresis in the reaction rate compared to the hysteresis occurring under certain reaction conditions on pure Pt(111) when the CO pressure is cyclically varied. When copper was evaporated onto the Pt crystal, the kinetic phase transition between the high and low rate regimes shifted to higher CO pressures and the reaction rate increased. In addition, the CO pressure range in which bistability was observed became wider. Upon increasing the copper coverage, the shift showed a maximum at a coverage of 0.3 ML until at 0.7 ML no clear first-order transition in the reaction rate could be observed any more. The results suggest that the active site responsible for the increased activity lies at the copper-platinum bimetallic border sites. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:447 / 457
页数:11
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