Structure and properties of cerium zirconium mixed oxide prepared under different precipitate aging processes
来源期刊：Journal of Rare Earths2016年第7期
论文作者：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
文章页码：695 - 703
摘 要：Oriented attachment and Ostwald ripening are two aging mechanisms of precipitation particles which may result in different 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）0.12O2 solid solution phase were obtained under oriented attachment aging process. The rod-like CeO2 phase coexisted with spherical Ce0.26Zr0.62（LaPr）0.12O2 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）0.10O2 solid solution with homogenous phase structure was generated by Ostwald ripening aging process, exhibiting higher oxygen storage capacity（501 μmol O2/g） and H2 consumption per gram（1378.3 μmol H2/g）.
王琦1，岳梅1，钟强1，崔梅生1，黄小卫1，侯永可1，王磊1，杨宇轩2，龙志奇1，冯宗玉1
1. National Engineering Research Center for Rare Earth Materials,General Research Institute for Nonferrous Metals,and Grirem Advanced Materials Co.Ltd.2. Jiangsu Guosheng Rare Earth Co.,Ltd.
摘 要：Oriented attachment and Ostwald ripening are two aging mechanisms of precipitation particles which may result in different 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）0.12O2 solid solution phase were obtained under oriented attachment aging process. The rod-like CeO2 phase coexisted with spherical Ce0.26Zr0.62（LaPr）0.12O2 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）0.10O2 solid solution with homogenous phase structure was generated by Ostwald ripening aging process, exhibiting higher oxygen storage capacity（501 μmol O2/g） and H2 consumption per gram（1378.3 μmol H2/g）.
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