氧化共沉淀法制备纳米级铈锆固溶体  

Nanocrystal Ceria-Zirconia Solid Solution Prepared by Oxidation-Coprecipitation Method

作　　者：张顺海[1] 蒋平平[1] 郭耘[1] 郭杨龙[1] 王筠松[1] 吴东方[1] 卢冠忠[1] 

机构地区：[1]华东理工大学工业催化研究所,上海200237

出　　处：《中国稀土学报》2003年第z2期64-66,共3页Journal of the Chinese Society of Rare Earths

基　　金：上海市科技发展基金项目(033012001);上海市科委纳米专项(0123nm025)

摘　　要：采用改进的氧化共沉淀法制备了Ce0.5Zr0.5O2固溶体,利用XRD和BET测定了其结构和比表面积。采用H2的程序升温还原(TPR)研究铈锆固溶体的还原特性,以考察它的低温还原特性。改进的氧化共沉淀法制备的铈锆固溶体在550℃可形成立方相固溶体,具有较大的比表面积和较小的晶粒度,同时还具有良好的低温还原特性和较高的热稳定性,经900℃焙烧6h后比表面积达到34.37m2·g-1。Nanocrystal Ce_(0.5)Zr_(0.5)O_2 solid solution was prepared by a novel oxidation-coprecipitation method. The structure of products were characterized by XRD and BET surface area. The reduction features of the ceria-zirconia solid solution were measured by temperature-programmed reduction(TPR). The cubic ceria-zirconia solid solution formed at 550 ℃ showed large specific surface area, small crystallite size and low reduction temperature. The samples exhibited better thermal stability, and maintained surface area of 34.37 m^2·g^(-1) after calcining at 900 ℃ for 6 h.

关 键 词：铈锆固溶体 氧化共沉淀法 程序升温还原 稀土 

分 类 号：U464[机械工程—车辆工程]