The dynamic catalytic surface: probing bimetallic active sites with medium energy ion scattering

被引：24

作者：

Baddeley, CJ

Bloxham, LH

Laroze, SC

Raval, R

Noakes, TCQ

Bailey, P

机构：

[1] Univ Liverpool, Leverhulme Ctr Innovat Catalysis, Liverpool L69 7ZD, Merseyside, England

[2] Univ Liverpool, Surface Sci Res Ctr, Liverpool L69 7ZD, Merseyside, England

[3] CCLRC Daresbury Lab, Warrington WA4 4AD, Cheshire, England

来源：

SURFACE SCIENCE | 1999年 / 433卷

关键词：

alloys; catalysis; chlorine; medium-energy ion scattering; single-crystal surfaces; surface segregation;

D O I：

10.1016/S0039-6028(99)00465-3

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 shadowing and blocking effects exhibited by medium energy ion scattering (MEIS) make it a uniquely effective technique for the analysis of the layer composition of bimetallic surfaces. We use MEIS to study adsorbate-induced segregation effects at the Cu50Pd50(110) surface. We show that the clean surface composition is strongly dependent on sample preparation. In addition, the adsorption of chlorohydrocarbons causes substantial surface layer Cu enrichment (up to 100% Cu), whereas hydrocarbon adsorption causes Pd enrichment. We propose an explanation for the magnitude of these segregation effects in terms of the surface chemistry of these molecules. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：827 / 832

页数：6

共 11 条

[1]

BADDELEY CJ, UNPUB

[2] OXIDATION-INDUCED SEGREGATION AT THE PT0.5NI0.5(111) SURFACE STUDIED BY MEDIUM-ENERGY ION-SCATTERING [J].