催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (3): 264-268.

• 研究论文 • 上一篇    下一篇

CeO2-TiO2复合氧化物的制备、表征及其对CO氧化的催化性能

梁飞雪1,2,朱华青1,秦张峰1,王辉1,2,王国富,王建国1   

  1. 1 中国科学院山西煤炭化学研究所煤转化国家重点实验室, 山西太原 030001; 2 中国科学院研究生院, 北京 100049
  • 收稿日期:2008-03-25 出版日期:2008-03-25 发布日期:2012-03-01

Preparation and Characterization of CeO2-TiO2 Composite Oxide and Its Catalytic Performance for CO Oxidation

LIANG Feixue1,2, ZHU Huaqing1, QIN Zhangfeng1, WANG Hui1,2, WANG Guofu1, WANG Jianguo1*   

  1. 1 State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, The Chinese Academy of Sciences, Taiyuan 030001, Shanxi, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2008-03-25 Online:2008-03-25 Published:2012-03-01

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摘要： 采用溶胶-凝胶法制备了一系列不同n(Ce)/n(Ti)的CeO2-TiO2复合氧化物,对复合氧化物的物相结构、形貌特征、比表面积和氧化还原性质进行了表征,并考察了复合氧化物对CO氧化反应的催化性能. 结果表明,n(Ce)/n(Ti)＞0.10时,复合氧化物为无定形结构;n(Ce)/n(Ti)=0.10～0.30时,复合氧化物失去CeO2和TiO2各自的特征,形成CeO2-TiO2固溶体,具有较大的比表面积. CeO2-TiO2复合氧化物本身对CO氧化反应的催化活性不如TiO2或CeO2的高,但Pd/CeO2-TiO2比Pd/TiO2或Pd/CeO2具有更高的催化活性.

关键词: 溶胶-凝胶法, 二氧化铈, 二氧化钛, 复合氧化物, 钯, 负载型催化剂, 一氧化碳, 氧化反应

Abstract: A series of CeO2-TiO2 composite oxide samples with differentn(Ce)/n(Ti)were prepared by the sol-gel method. The phase structure, morphology, surface area, and redox properties of the composite oxide samples were investigated through N2 adsorption,X-raydiffraction, transmission electron microscopy, and temperature-programmed reduction, and their catalytic performance for CO oxidation was measured. The amorphous CeO2-TiO2 composite oxide was formed gradually whenn(Ce)/n(Ti)was higher than 0.10. Withn(Ce)/n(Ti)=0.10-0.30, the amorphous CeO2-TiO2 solid solution with high surface area was formed and exhibited the characteristics of neither CeO2 nor TiO2. Although CeO2-TiO2 had lower catalytic activity than either TiO2 or CeO2 for CO oxidation, the Pd/CeO2-TiO2 catalyst presented excellent performance for CO oxidation.

Key words: sol-gel method, ceria, titania, composite oxide, palladium, supported catalyst, carbon monoxide, oxidation