文献类型：期刊文献

英文题名：Low-temperature CO oxidation over Co3O4-based catalysts: Significant promoting effect of Bi2O3 on Co3O4 catalyst

作者：Lou, Yang[1];Wang, Li[1];Zhao, Zhenyang[1];Zhang, Yanhui[1];Zhang, Zhigang[1];Lu, Guanzhong[1];Guo, Yun[1];Guo, Yanglong[1]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China

年份：2014

卷号：146

起止页码：43

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：;EI(收录号：20134216869789);WOS:【SCI-EXPANDED(收录号:WOS:000327904000006)】；

基金：This project was supported financially by the National Basic Research Program of China (2010CB732300, 2013CB933201), the National High Technology Research and Development Program of China (2011AA03A406), National Natural Science Foundation of China (21171055), and the New Century Excellent Talents in University (NECT-10-0377).

语种：英文

外文关键词：Low-temperature CO oxidation; Oxygen vacancy; Co3O4; Bi2O3; O-2 activation

摘要：The modification of Co3O4 by Bi2O3 significantly enhanced its catalytic performance for CO oxidation. The 20 wt.% Bi2O3-Co3O4 exhibited the best catalytic performance. The results of H-2-TPR and CO-TPR revealed that the mobility of oxygen was accelerated greatly and the ability of low-temperature oxygen activation was the crucial factor to improve the catalytic performance. Bi2O3 entered the lattice of Co3O4 caused the structural defect and lattice distortion, which should be the origin of the high O-2 activation ability and mobility. Structure-performance correlation demonstrated that the low-temperature oxygen activation was dependent on the defective degree of structure, which was determined by the content of Bi2O3 . The catalytic behaviors under different reaction conditions revealed that CO could effectively adsorb on the surface active sites and CO2 could competitively adsorb on the active sites. The ability to supply the active O-2 species was suggested to be a key step. The kinetic data showed not only the amount of surface active sites were increased on the surface of Co3O4 but also the catalytic ability of single active site was enhanced greatly. (C) 2013 Elsevier B.V. All rights reserved.