Effects of precipitate aging time on the cerium-zirconium composite oxides

• Published in: Journal of rare earths Vol. 32; no. 11; pp. 1010 - 1015
• Main Author: 钟强 崔梅生 岳梅 王琦 王磊 郭荣贵 龙志奇 黄小卫
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2014
• Subjects: BET比表面积; Cerium oxide; cerium-zirconium composite oxides; co-precipitation; Oxides; precipitate aging time; Precipitates; Precipitation; Rare earth compounds; Rare earth metals; rare earths; Scanning electron microscopy; Specific surface; thermal stability; X射线衍射; Zirconium; 共沉淀法; 扫描电子显微镜; 稀土氯化物; 程序升温还原; 老化时间; 铈锆复合氧化物; co-precipitation; thermal stability; precipitate aging time; cerium-zirconium composite oxides; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(14)60175-7

Cerium-zirconium composite oxides with high performance were synthesized by a co-precipitation method, using zirconium oxychloride and rare earth chloride as raw materials. The effects of precipitate aging time on the properties of cerium-zirconium composite oxides were investigated. The prepared cerium-zirconium composite oxides were characterized by X-ray diffraction（XRD）, BET specific surface area, pulsed oxygen chemical adsorption, H2 temperature-programmed-reduction（H2-TPR）, scanning electron microscopy（SEM）, etc. The results showed that the precipitate aging time caused great effects on the properties of cerium zirconium composite oxides. With the increase of aging time, the cerium zirconium composite oxides showed enhanced specific surface area, good thermal stability, and high oxygen storage capacity（OSC）. The best performance sample was obtained while the precipitate aging time up to 48 h, with the specific surface area of 140.7 m2/g, and OSC of 657.24 μmolO2/g for the fresh sample. Even after thermal aged under 1000 oC for 4 h, the aged specific surface area was 41.6 m2/g, moreover with a good OSC of 569.9 μmolO2/g.