期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 144, 期 -, 页码 325-332出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2013.07.037
关键词
Transition metal; CO chemisorption; Solid solution; Oxygen vacancies; Synergetic effect
资金
- Natural Science Foundation of China [21173195, 21203167]
- Program for Changjiang Scholars and Innovative Research Team in Chinese Universities [IRT0980]
A series of xMO(y)/Ce0.9M0.1-xO2-delta (M = Cu, Ni, Co, Fe) catalysts (Ce-M) were prepared by a sol-gel method and corresponding Ce0.9M0.1-xO2-delta catalysts (HCe-M) were obtained with an acid treatment. It was found that the Ce-M catalysts contained surface MOy species and Ce0.9M0.1-xO2-delta solid solution, as confirmed by the results of X-ray diffraction and Raman spectra, respectively. While the HCe-M catalysts only contained Ce0.9M0.1-xO2-delta solid solution. CO oxidation over these catalysts revealed that the activities followed an order of Ce-Cu > Ce-Ni > Ce-Co > Ce-Fe, but were remarkably higher than the corresponding HCe-M samples. The activities of the HCe-M catalysts were closely related to their reducibility originated from the oxygen vacancies in these samples. The most active HCe-Cu catalyst had the highest content of oxygen vacancies and thus was the most reducible. For the Ce-M catalysts, the enhanced catalytic performance was due to a synergy between the surface MOy species and the Ce-M-O solid solution, as the former provided sites for CO chemisorption and the latter promoted the activation of oxygen. (C) 2013 Elsevier B.V. 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