还原热处理对铈锆铝复合氧化物性能的影响

引用本文: 肖益鸿, 杨黄根, 蔡国辉, 郑勇, 郑瑛, 魏可镁. 还原热处理对铈锆铝复合氧化物性能的影响[J]. 物理化学学报, 2012, 28(01): 245-250. doi: 10.3866/PKU.WHXB201228245 shu

Citation: XIAO Yi-Hong, YANG Huang-Gen, CAI Guo-Hui, ZHENG Yong, ZHENG Ying, WEI Ke-Mei. Influence of Reductive Treatment on the Performance of CeO₂-ZrO₂-Al₂O₃ Composite Oxide[J]. Acta Physico-Chimica Sinica, 2012, 28(01): 245-250. doi: 10.3866/PKU.WHXB201228245 shu

还原热处理对铈锆铝复合氧化物性能的影响

基金项目:
福建省工业科技重大项目(2010H6014)资助 (2010H6014)

摘要: 采用共沉淀法制备铈锆铝复合氧化物(CeO₂-ZrO₂-Al₂O₃, CZA)和铈锆复合氧化物(CeO₂-ZrO₂, CZ), 将样品分别在空气和10% H₂/Ar 气氛下进行热处理, 利用X射线粉末衍射(XRD)、O₂脉冲吸附、H₂程序升温还原(H₂-TPR)等手段研究了复合氧化物的结构及性能. 结果表明: CZA样品经950 °C还原热处理后出现CeAlO₃晶相, 热处理温度越高, 越有利于CeAlO₃物相生成. CZA 储氧量(OSC)随着还原热处理温度升高逐渐增大, 至900 °C达到1270.3 μmol·g^-1; 温度继续升高, OSC减小, 1100 °C还原热处理后CZA的OSC仅为23.2 μmol·g^-1. 研究发现还原热处理中形成CeAlO₃, 其显著影响CZA样品的储氧性能和还原性能.

关键词:

English

Influence of Reductive Treatment on the Performance of CeO₂-ZrO₂-Al₂O₃ Composite Oxide

1.
National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002, P. R. China
Received Date: 02 September 2011
Available Online: 29 December 2011
Fund Project:
福建省工业科技重大项目(2010H6014)资助

Abstract: A CeO₂-ZrO₂-Al₂O₃ composite oxide (CZA) and a CeO₂-ZrO₂ composite oxide (CZ) were prepared by the co-precipitation method. The samples were thermally aged in a flowing air atmosphere and in 10% H₂/Ar flow. The structure and performance of the composite oxides were studied by X-ray diffraction (XRD), oxygen storage capacity (OSC) measurements, and H₂ temperature-programmed reduction (H₂- TPR). The results show that a CeAlO₃ phase was formed after CZA was reductively aged at 950 °C and an increase in temperature benefited the formation of CeAlO₃. The OSC of CZA increased with an increase in the reductive treatment temperature and it was 1270.3 μmol·g^-1 when the temperature reached 900 °C. However, the OSC decreased with an increase in the temperature. After CZA was reduced at 1100 °C the OSC was only 23.2 μmol·g^-1. We found that the OSC and the reducibility of the material were remarkably influenced by the formation of a CeAlO₃ phase after CZA was reductively aged.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

还原热处理对铈锆铝复合氧化物性能的影响

English

Influence of Reductive Treatment on the Performance of CeO₂-ZrO₂-Al₂O₃ Composite Oxide

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