期刊
JOURNAL OF CATALYSIS
卷 294, 期 -, 页码 216-222出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2012.07.024
关键词
Inverse model catalyst; Gold catalysts; Iron oxide; Reaction mechanism; CO oxidation
资金
- Department of Energy [DE-FG02-04ER 15587]
- Welch Foundation [F-1436]
- US Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
CO oxidation is studied at pressures between 4 and 100 Tort and temperatures from 400 K to 670 K on inverse model catalysts made of Fe2O3 nanoclusters grown on a Au(111) single crystal surface. The addition of Fe2O3 nanoclusters transformed the inert Au(111) single crystal into an active catalyst for CO oxidation. The catalytic activity increases with iron oxide coverage initially and then decreases when the iron oxide coverage is greater than 0.5 monolayers. Additionally, when the iron oxide particles form a continuous film on Au(111), there is no catalytic activity. These experimental results strongly suggest that the active sites for CO oxidation are located at the iron oxide/gold perimeter. Kinetic measurements suggest that CO oxidation by chemisorbed oxygen at the Fe2O3/Au perimeter is likely to be the rate-limiting step. Carbon deposition observed via a post-reaction Auger electron spectra suggests that multiple reaction pathways are involved in CO oxidation over Fe2O3/Au(111). (C) 2012 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据