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

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• 作者：Qi WANG (王 琦)^a ; Mei YUE (岳 梅)^a ; Qiang ZHONG (钟 强)^a ; Meisheng CUI (崔梅生)^a ; Xiaowei HUANG (黄小卫)^a ; ^{hxw0129@126.com" class="auth_mail" title="E-mail the corresponding author} ; Yongke HOU (侯永可)^a ; Lei WANG (王 磊)^a ; Yuxuan YANG (杨宇轩)^b ; Zhiqi LONG (龙志奇)^a ; Zongyu FENG (冯宗玉)^a
• 关键词：cerium zirconium mixed oxides ; Ostwald ripening ; oriented attachment ; co-precipitation ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：34
• 期：7
• 页码：695-703
• 全文大小：1745 K

文摘

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% Ce_0.26Zr_0.62(LaPr)_0.12O₂ solid solution phase were obtained under oriented attachment aging process. The rod-like CeO₂ phase coexisted with spherical Ce_0.26Zr_0.62(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 °C 4 h thermal treatment. However, through controlling the aging process, the Ce_0.35Zr_0.55(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).