XPS study of oxygen adsorption on supported silver: Effect of particle size

被引：60
|
作者：
Bukhtiyarov, VI
Carley, AF
Dollard, LA
Roberts, MW
机构：
[1] BORESKOV INST CATALYSIS, NOVOSIBIRSK 630090, RUSSIA
[2] UNIV WALES COLL CARDIFF, DEPT CHEM, CARDIFF CF1 3TB, S GLAM, WALES
来源：
SURFACE SCIENCE | 1997年 / 381卷 / 2-3期
关键词：
carbon; chemisorption; clusters; oxygen; silver; soft x-ray photoelectron spectroscopy;
D O I：
10.1016/S0039-6028(97)00057-5
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 suggestion that two types of oxygen species are necessary for ethylene epoxidation is investigated using a model carbon-supported silver catalyst. It is established that the relative populations of the nucleophilic and electrophilic oxygen species are strongly dependent on silver particle size, the nucleophilic oxygen only being observed for cluster sizes greater than 300 Angstrom. The observation that the two types of oxygen only co-exist on large silver particles is consistent with reported epoxidation rates for silver catalysts. (C) 1997 Elsevier Science B.V.
引用
收藏
页码：L605 / L608
页数：4
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