Spatial variations of the interface composition during surface chemical reactions

被引：11

作者：

Günther, S

Marbach, H

Hoyer, R

Imbihl, R

Gregoratti, L

Kiskinova, M

机构：

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

[2] Univ Hannover, Inst Phys Chem & Elektrochem, D-30167 Hannover, Germany

来源：

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA | 2001年 / 114卷

关键词：

surface reactions; spectromicroscopy; surface diffusion; potassium; oxygen; hydrogen;

D O I：

10.1016/S0368-2048(00)00262-0

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

The spatial distribution of potassium under reaction conditions on a composite Pt/Rh catalyst has been studied employing photoelectron spectromicroscopy as in situ method during the H-2 + O-2 reaction. The composite catalyst consisted of a 70X70 mum(2) Pt domain on a Rh(110) surface predosed with a submonolayer coverage of potassium. This catalyst. was er;posed to an O-2 + H-2 atmosphere in the 10(-7) mbar range. The combination of chemical specific imaging with a spatial resolution of 0.12 mum and micro-spot spectroscopy provided direct evidence for lateral re-distribution of potassium into a stationary concentration pattern under reaction conditions. The identity of the adsorbed species in the pattern and the changes in the chemical state of the substrate were determined. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：989 / 996

页数：8

共 22 条

[1] Core level binding energy shifts in interfaces between 4d and alkali metals [J].