Catalytic Oxidative Properties and Characterization of CuO/CeO_2 Catalysts

作     者：蒋晓原 周仁贤 袁骏 吕光烈 郑小明 

作者机构：Institute of Catalysis State Key Laboratory of Silicon M aterial Science Analysis and Test Center Zhejiang University 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2003年第21卷第1期

页      面：55-59页

核心收录：

学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：ProjectsupportedbyZhejiangProvinceEducationBoard ( 9812 2 99) 

主　　题：physical chemistry CuO/CeO 2 catalysts CO micro-reactor GC system rare earths 

摘      要：The oxidative properties and characterization of CuO, CeO 2 and CuO/CeO 2 cata lysts were examined by means of a CO micro-reactor GC system, TPR, XPS and X-r ay diffraction Rietveld methods. The results show that either CuO or CeO 2 ac tivity is quite low for CO oxidation. However, when CuO and CeO 2 are mixed, the oxidative activity of the catalyst increases significantly, probably owing to the valency status of copper species (Cu 2+ and Cu+) on the CeO 2 surfa ce, the dispersion and reducibility. XPS surface analysis shows that CuO loading is very important in forming of either Cu 2+ or Cu+. Rietveld analysis s hows that some CuO, which has smaller ion radius than Ce 4+, enters the Ce O 2 lattice after CuO and CeO 2 are mixed. When the CuO loading reaches 5.0%, the size of CuO crystals is a minimum (6.1 nm) and the micro-strain value i s a maximum (2.86×10 -3), resulting in high surface energy and the best ac tivity for CO oxidation.