改进共沉淀法以提高三效催化剂中铈锆复合氧化物的热稳定性(英文)  

Preparation of Ceria-zirconia Mixed Oxides with Improved Thermal Stability for Three-way Catalysts by a Modified Co-precipitation Method

作　　者：伍青峰 崔亚娟[2] 张海龙[3] 周怡[1] 兰丽[1] 王健礼[2] 陈耀强[1,2] WU Qing-Feng CUI Ya-Juan ZHANG Hai-Long ZHOU Yi LAN Li WANG Jian-Li CHEN Yao-Qiang(College of Chemistry, Sichuan University, Chengdu 610064, China Key Laboratory of Green Chemistry ＆ Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China College of Chemical Engineering, Si- chuan University, Chengdu 610064, China)

机构地区：[1]四川大学化学学院,成都610064 [2]四川大学化学学院,绿色化学与技术教育部重点实验室,成都610064 [3]四川大学化工学院,成都610064

出　　处：《无机材料学报》2017年第3期331-336,共6页Journal of Inorganic Materials

基　　金：National Natural Science Foundation Project of China(21173153);National Hi-tech Research and Development Program of China(863,2015AA034603)

摘　　要：采用共沉淀法制备了铈锆材料(铈锆比为3/2)。通过改进反应器装置(图1),延长了初始晶粒生长的时间,提高了铈锆材料的热稳定性。采用X射线衍射(XRD)、氮气吸脱附和透射电镜(TEM)对制备的材料进行了表征。结果表明,延长初始晶粒生长的时间可以得到较大尺寸的晶粒,这有利于提高材料的织构和结构性能,从而提高热稳定性。本研究将该材料应用于单Pd三效催化剂,表现出了优异的活性和热稳定性,具有良好的应用前景。A series of ceria-zirconia mixed oxides （CZ-x; x=0, 20, 40 and 80） with Ce/Zr molar ratio of 3/2 were syn- thesized by co-precipitation method. In order to improve the thermal stability of ceria-zirconia mixed oxides, we extended the time for the primary grain to grow up by a modified synthesis reactor. The resulting samples were charac- terized by X-ray diffraction （XRD）, N2 adsorption-desorption, and transmission electron microscopy （TEM）. The re- sults revealed that bigger grain could be obtained by extending time for the primary grain to grow up, which was pro- pitious to enhance the textural properties and structural properties of the materials. Thus, the thermal stability of the materials was improved. In this study, the materials were applied in the field of Pd-only three way catalysts （TWCs）. The catalysts exhibited excellent catalytic performance and thermostability, showing better prospect in application.

关 键 词：铈锆材料 初始晶粒 共沉淀法 热稳定性 

分 类 号：TQ174[化学工程—陶瓷工业]