Structure and properties of cerium zirconium mixed oxide prepared under different precipitate aging processes

• Published in: Journal of rare earths Vol. 34; no. 7; pp. 695 - 703
• Main Author: 王琦 岳梅 钟强 崔梅生 黄小卫 侯永可 王磊 杨宇轩 龙志奇 冯宗玉
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.07.2016
• Subjects: cerium zirconium mixed oxides; co-precipitation; oriented attachment; Ostwald ripening; Ostwald熟化; rare earths; 性能; 时效工艺; 沉淀物; 混合氧化物; 混合结构; 老化过程; 铈锆复合氧化物; co-precipitation; Ostwald ripening; cerium zirconium mixed oxides; oriented attachment; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(16)60081-9

Oriented attachment and Ostwald ripening are two aging mechanisms of precipitation particles which may result in differ- ent crystallization mechanism of precipitates during the aging process. In this work, the effects of different aging process on the structure and properties of cerium zirconium mixed oxides were investigated. The results indicated that the mixed structure of 11.48% CeO2 phase and 88.52% Ce0.26Zr0.62（LaPr）0.1202 solid solution phase were obtained under oriented attachment aging process. The rod-like CeO2 phase coexisted with spherical Ce0.26Zr0.62（LaPr）0.1202 solid solution phase, which improved the surface area （64 m2/g） and pore volume （0.32 mL/g） of cerium zirconium mixed oxides after 1000 ℃ 4 h thermal treatment. However, through controlling the aging process, the Ce0.35Zr0.55（LaPr）0.1002 solid solution with homogenous phase structure was generated by Ostwald ripening ag- ing process, exhibiting higher oxygen storage capacity （501 μmol O2/g） and H2 consumption per gram （1378.3 μmol H2/g）.