溶胶-凝胶法制备CeO2负载CuO低温CO氧化催化剂

摘要：

@@ 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.

机标关键词：溶胶、凝胶、法制、负载、氧化催化剂、CO oxidation、catalytic activity、precious metals、conventional impregnation、ignition temperature、catalyst activity、promotion effect、emission control、metal catalysts、low temperature、combined effect、copper content、copper oxide、exhaust gas

所属期刊栏目：24

分类号：O643/X7(物理化学（理论化学）、化学物理学)

资助基金：国家自然科学基金20271028;天津市自然科学基金033602511

在线出版日期：2004-02-20（万方平台首次上网日期，不代表论文的发表时间）

页数：共2页

页码：887-888