Characterization of CeO_2-ZrO_2 mixed oxides prepared by two different co-precipitation methods

作     者：岳梅 崔梅生 张娜 龙志奇 黄小卫 

作者机构：National Engineering Research Center for Rare Earth MaterialsGeneral Research Institute for Nonferrous Metalsand Grirem Advanced Materials Co. Ltd. 

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

年 卷 期：2013年第31卷第3期

页      面：251-256页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：Project supported by Twelfth Five-Year National Science and Technology Pillar Program (2012BAE01B02) Eleventh Five-Year National 863 Program (2010AA03A405) 

主　　题：cerium zirconium mixed oxide magnesium hydrogen carbonate mixed ammonia-ammonia hydrogen carbonate co-pre-cipitation rare earths 

摘      要：A series of cerium zirconium mixed oxides were prepared by two co-precipitation methods using magnesium hydrogen carbonate （MHC） and mixed ammonia-ammonia hydrogen carbonate （AAHC） as precipitant respectively. The crystal structure, BET surface area and morphology of the produced cerium zirconium mixed oxides were characterized by X-ray diffraction （XRD）, Bru- mauer-Emmett-Teller （BET） and scanning electron microscopy （SEM） techniques. The reduction-oxidation behavior and oxygen storage capacity （OSC） performance were also studied by temperature programmed reduction （TPR） and oxygen pulse chemical adsorption methods. The XRD results demonstrated that the cerium zirconium mixed oxides obtained by both methods possessed struc ture of cubic solid solution phase. The fresh surface area calcinated at 600 ℃, aged surface area after 1000 ℃and OSC at 500 ℃ of cerium zirconium mixed oxides were determined to be 89.337, 34.784 ma/g, and 567 pmol O2/g for MHC method and 122.010, 46.307 m2/g, and 665 pmol O2/g for AAHC method, respectively.