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Studies on the surface migration of adsorbed oxygen from noble metals to silver over binary catalysts
Author(s) -
Huang W. X.,
Teng J. W.,
Bao X. H.
Publication year - 2001
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1032
Subject(s) - catalysis , oxygen , chemistry , desorption , adsorption , noble metal , platinum , x ray photoelectron spectroscopy , inorganic chemistry , surface diffusion , chemical engineering , organic chemistry , engineering
Adsorbed oxygen migration from noble metals to silver was investigated on both an Ag/Pt(110) model catalyst and Al 2 O 3 ‐supported Ag–Pd catalysts by photoelectron emission microscopy (PEEM) and oxygen temperature‐programmed desorption (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 diffusion of oxygen was coupled locally with a surface reaction of CO ad + O ad , giving rise to rapid propagation of the oxygen front. Migration of oxygen from the Pd surface to the Ag surface was proved also by oxygen TPD experiments on Al 2 O 3 ‐supported Ag–Pd catalysts. Copyright © 2001 John Wiley & Sons, Ltd.