Preparation and Characterization of CexTh1-xO2 Solid Solutions Prepared by Sol-Gel Method
来源期刊：JOURNAL OF RARE EARTHS2005年第2期
论文作者：Liu guangyu LUO Mengfei Zhao Leihong
Key words：catalytic chemistry; CexTh1-xO2 solid solution; reduction properties; rare earths;
Abstract: The CexTh1-xO2 solid solutions were prepared by citrate sol-gel method, and their structure and reduction properties were studied. XRD shows that solid solution with cubic phase formed in all the solid solutions (x = 0.2, 0.5, 0.8) CexTh1-xO2. Raman spectrum shows that Ce-Th complex oxides can promote the formation of oxygen vacancies. Two reduction peaks appear in the TPR profiles of Cex Th1-xO2 solid solution. The α peak is attributed to the reduction of Ce4+ on the surface, and the β peak is attributed to the reduction of bulk CeO2. The incorporation of Th atom into CeO2 improves the reduction of CeO2. CexTh1-xO2 mixed oxides are promising materials for oxygen vacancies produced, as well as catalysts for many reactions involved oxygen, such as the catalysts for three-way reactions for reducing the releasing pollutants or combustion of VOCs.
Liu guangyu1，LUO Mengfei1，Zhao Leihong1
(1.Institute of Physical Chemistry, Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Zhejiang Normal University Jinhua 321004, China)
Abstract:The CexTh1-xO2 solid solutions were prepared by citrate sol-gel method, and their structure and reduction properties were studied. XRD shows that solid solution with cubic phase formed in all the solid solutions (x = 0.2, 0.5, 0.8) CexTh1-xO2. Raman spectrum shows that Ce-Th complex oxides can promote the formation of oxygen vacancies. Two reduction peaks appear in the TPR profiles of Cex Th1-xO2 solid solution. The α peak is attributed to the reduction of Ce4+ on the surface, and the β peak is attributed to the reduction of bulk CeO2. The incorporation of Th atom into CeO2 improves the reduction of CeO2. CexTh1-xO2 mixed oxides are promising materials for oxygen vacancies produced, as well as catalysts for many reactions involved oxygen, such as the catalysts for three-way reactions for reducing the releasing pollutants or combustion of VOCs.
Key words:catalytic chemistry; CexTh1-xO2 solid solution; reduction properties; rare earths;
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