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题名: Structure and redox properties of CexTi1-xO2 solid solution
作者: Luo, MF;  Chen, J;  Chen, LS;  Lu, JQ;  Feng, Z;  Li, C
刊名: CHEMISTRY OF MATERIALS
发表日期: 2001
卷: 13, 期:1, 页:197-202
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Materials Science
英文摘要: A series of CexTi1-xO2 mixed oxide materials was synthesized by a sol-gel method with it: varying from 0.1 to 0.9 and characterized by XRD, Raman, and TPR techniques. The structure of the mixed oxides changes with the Ce/Ti ratio. When the x value is decreased from 1.0 to 0.6 for CexTi1-xO2, only a cubic phase is detected, and the lattice parameter of the cubic phase decreases because of the formation of a solid solution by substituting Ti atoms into a CeO2 lattice. When x = 0.3, a new phase is observed. The structure of this new phase was characterized by Rietveld refinement of X-ray diffraction data. This mixed oxide adopts the monoclinic symmetry with the space group C2/m and a = 0.9811(8) nm, b = 0.3726(3) nm, c = 0.6831(6) nm, and beta = 118.84 degrees. When x = 0.4 and 0.5, a mixed phase region is detected. The addition of Ti atoms into CeO2 significantly improves the storage capacity of mobile oxygen of CeO2 by increasing the reduction extent of the mixed oxides. When x = 0.3-0.6, the valence value of Ce after a TPR run is estimated to be close to +3, which obviously is smaller than that for reduced CeO2 alone. The Ce0.5Ti0.5O2 sample shows the highest capacity of storage oxygen among CexTi1-xO2 mixed oxides. The capacity for reoxidation of the reduced CeO2-rich solid solution is higher than that of CeO2-lean mixed oxides. CexTi1-xO2 mixed oxides are promising materials for oxygen storage as well as catalysts for many reactions involving oxygen, such as the catalysts for a three-way reaction to reduce the pollutant emissions or combustion of volatile organic compounds.
关键词[WOS]: OXYGEN STORAGE CAPACITY ;  THERMAL-STABILITY ;  CARBON-MONOXIDE ;  CATALYSTS ;  OXIDATION ;  BEHAVIOR ;  CERIA ;  OXIDES ;  CO
语种: 英语
WOS记录号: WOS:000166509600035
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139008
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Zhejiang Univ, Cent Lab, Hangzhou 310028, Peoples R China

Recommended Citation:
Luo, MF,Chen, J,Chen, LS,et al. Structure and redox properties of CexTi1-xO2 solid solution[J]. CHEMISTRY OF MATERIALS,2001,13(1):197-202.
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