溶胶-凝胶法制备CeO2负载CuO低温CO氧化催化剂
Low-Temperature CO Oxidation on CuO/CeO2 Catalyst Prepared by Sol-Gel Method
Ceria is widely used as a promoter in "three-way catalysts" (TWC). The promotion effect of ceria was originally supposed to be in the structural aspects and chemical ones[1]. Precious metals are widely used for exhaust gas emission control[2,3]. However, because the high cost of precious metals and their sensitivity to sulfur poisoning, attention has been given to nonprecious metal catalysts such as copper oxide[4～9]. Luo et al[4] reported that CuO/CeO2 catalyst showed markedly enhanced catalytic activity for CO oxidation due to the combined effect of CuO and CeO2. They proposed that the well-dispersed CuO, which can adsorb CO and is reducible at low temperature, is responsible for low-temperature CO oxidation. Our group[5] has prepared CuO/CeO2 catalyst by solvated metal atom impregnation (SMAI) and conventional impregnation (CI). The CuO/CeO2 prepared via SMAI gave a one-step reduction during TPR experiment, whereas that prepared via CI gave a two-step reduction due to the existence of two kinds of CuO species. Liu et al[6] found that when w(CuO)＜12%, the ignition temperature and the total conversion temperature for the reaction decreased with the increase of copper content in the catalyst. When w(CuO)＞12%, the excess copper had little effect on the catalyst activity owing to the formation of bulk CuO particles. In this paper, the CuO/CeO2 catalyst was prepared by the impregnation of CeO2 nano-powder with Cu(NO3)2 solution and its catalytic activity for CO oxidation was determined.
作 者： 郑修成 黄唯平 张守民 王淑荣 吴世华 Zheng Xiucheng HUANG Weiping ZHANG Shoumin WANG Shurong Wu Shihua
作者单位： Department of Chemistry,Nankai University,Tianjin 300071,China
刊 名： 催化学报 ISTIC SCI PKU
英文刊名： CHINESE JOURNAL OF CATALYSIS
年，卷(期)： 2003 24(12)
分类号： O643/X7
关键词： carbon monoxide oxidation copper oxide ceria sol-gel method
机标分类号： O64 TQ1
机标关键词： 溶胶凝胶法制负载氧化催化剂CO oxidationcatalytic activityprecious metalsconventional impregnationignition temperaturecatalyst activitypromotion effectemission controlmetal catalystslow temperaturecombined effectcopper contentcopper oxideexhaust gas
基金项目： 国家自然科学基金，天津市自然科学基金
