CeO2、TiO2及Ce0.5Ti0.5O2催化载体的制备及性能研究-中国材料进展

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Title:: Preparation and Properties of CeO2, TiO2 and Ce0.5Ti0.5O2 Catalytic Carriers

作者:: 刘欣1; 2; 3; 贾伟1; 4; 张爱琴1; 申倩倩1; 4; 贾虎生1; 4; 许并社1; 4; (1. 太原理工大学新材料界面科学与工程教育部重点实验室，山西太原 030024)(2. 太原理工大学材料科学与工程学院，山西太原 030024)(3. 中海油太原贵金属有限公司,山西太原 030006)(4. 太原理工大学新材料工程技术研究中心，山西太原 030024）

Author(s):: LIU Xin1; 2; 3; JIA Wei1; 4; ZHANG Aiqin1; SHEN Qianqian1; 4; JIA Husheng1; 4; XU Bingshe1; 4; (1. Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education,Taiyuan University of Technology, Taiyuan 030024, China)（2. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China）（3. China National Offshore Oil Taiyuan Precious Metals Co.,Ltd., Taiyuan 030006, China）(4. Research Centre of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China)

Keywords:: ceria; titania; preparation method; redox property; catalytic carriers

摘要:: 采用热分解法、溶胶-凝胶法、沉淀法和水热法制备了CeO2载体，SEM、XRD表征、N2低温吸脱附和氢气程序升温还原（H2-TPR）实验和结果分析显示，溶胶-凝胶法制备样品具有更优的比表面积、孔容、孔径和氧化还原性能，故选择溶胶-凝胶法制备Ti0.5Ce0.5O2混合氧化物催化载体。使用XRD、SEM、N2低温吸脱附、H2-TPR等分析手段对产物的物相特征、吸附性能和氧化还原性能进行了表征。Ti0.5Ce0.5O2的H2-TPR在261、529和749 ℃处出现耗氢峰，分别归属于表面吸附氧的还原、表面晶格氧的还原和体相晶格氧的还原，TEM结果表明Ti4+离子进入CeO2晶格形成TiO2-CeO2填隙固溶体，固溶体的形成有利于载体氧化还原能力的增强。

Abstract:: The CeO2 carriers were prepared by thermal decomposition, sol-gel, precipitation and hydrothermal methods. The results of XRD and SEM analysis, N2 adsorptiondesorption isotherms and H2temperatureprogrammed reduction (H2-TPR) patterns showed that the CeO2 particles obtained by sol-gel method possess good specific surface area, pore volume, pore diameter, and redox performance. Therefore, The mixed oxide catalyst carrier Ce0.5Ti0.5O2 was prepared by sol-gel method. The phase analysis, adsorption and redox properties of samples were investigated. The positions of hydrogen consumption peak of Ce0.5Ti0.5O2 H2-TPR pattern were 261, 529 and 749 ℃, attributed to adsorbed oxygen redox on the surface, lattice oxygen redox on the surface and the body phase lattice oxygen redox, respectively. The result of TEM showed that Ti4+ entered into the CeO2 lattice and formed interstitial solid solution, it not only reduced the reduction temperature of CeO2 and TiO2, but also enhanced the redox property.