Studies on the surface migration of adsorbed oxygen from noble metals to silver over binary catalysts

Citation
Wx. Huang et al., Studies on the surface migration of adsorbed oxygen from noble metals to silver over binary catalysts, SURF INT AN, 32(1), 2001, pp. 179-182
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
SURFACE AND INTERFACE ANALYSIS
ISSN journal
0142-2421 → ACNP
Volume
32
Issue
1
Year of publication
2001
Pages
179 - 182
Database
ISI
SICI code
0142-2421(200108)32:1<179:SOTSMO>2.0.ZU;2-Q
Abstract
Adsorbed oxygen migration from noble metals to silver was investigated on b oth an Ag/Pt(110) model catalyst and Al2O3-supported Ag-Pd catalysts by pho toelectron emission microscopy (PEEM) and oxygen temperature-programmed des orption (TPD). On the CO-precovered Ag/Pt(110) surface, oxygen was observed to diffuse from the Pt(110) surface to the Ag surface by PEEM. The diffusi on of oxygen was coupled locally with a surface reaction of COad + O-ad, gi ving rise to rapid propagation of the oxygen front. Migration of oxygen fro m the Pd surface to the Ag surface was proved also by oxygen TPD experiment s on Al2O3-supported Ag-Pd catalysts. Copyright (C) 2001 John Wiley & Sons, Ltd.