NO催化氧化用CeO2/SiO2复合氧化物研究  

Study on the CeO2/SiO2 Composite Oxide for NO Catalytic Oxidation

作　　者：王加俊 常仕英[1,3] 赵云昆[1,2] 段耀宗 于飞 杨冬霞 WANG Jia-jun;CHANG Shi-ying;ZHAO Yun-kun;DUAN Yao-zong;YU Fei;YANG Dong-xia(State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China;Kunming Sino-platinum Metals Catalyst Co. Ltd.,Kunming 650101, China;Kunming University of Science and Technology, Kunming 650093, China)

机构地区：[1]昆明贵金属研究所稀贵金属综合利用国家重点实验室,云南昆明650106 [2]昆明贵研催化剂有限责任公司,云南昆明650101 [3]昆明理工大学,云南昆明650093

出　　处：《稀土》2018年第3期1-8,共8页Chinese Rare Earths

基　　金：国家“863”计划(2015AA034603F);国家自然科学基金-地区科学基金项目(21467010)

摘　　要：以正硅酸乙酯为硅源,Ce（NO3）3·6H2O为铈源,通过溶胶-凝胶一步法合成CeO2/SiO2纳米复合氧化物。通过N2-吸脱附、X射线衍射仪、扫描电子显微镜、透射电子显微镜、X射线光电子能谱仪、化学吸附仪等技术对复合氧化物的物相结构、形貌、尺寸、化学价态、氧化还原特性进行分析。结果表明,通过该合成方法可获得高分散、球状、孔隙发达的CeO2/SiO2复合氧化物;复合氧化物粒径在40 nm～70 nm,CeO2粒径尺寸在4 nm～6 nm之间;孔结构以中孔为主,优化了纯CeO2和纯SiO2的大孔结构;CeO2与SiO2间发生了显著的相互作用形成了化学键,有效提高了CeO2的氧化还原特性。The CeO2/SiO2 nanocomposite oxide powders were synthesized by sol-gel method by using teraethylorthosilicate as source of the SiO2 microspheres and cerium（ III） nitrate hexahydrate as the source of CeO2. The phase structure,morphology,size,chemical valence and redox performance of the composite oxides were analyzed by means of N2-adsorption,X-ray diffraction（ XRD）,scanning electron microscopy（ SEM）,transmission electron microscopy（ TEM）,X-ray photoelectron spectroscopy（ XPS） and temperature-programmed reduction（ H2-TPR）. The results show that the CeO2/SiO2 composite oxide with high dispersion,spherical shape and porosity is obtained by the synthesis method. The composite oxide has a particle size of 40-70 nm and the CeO2 particle size is between 4 and 6 nm. And the pore structure of pure CeO2 and pure SiO2 was optimized.The chemical bond between CeO2 and SiO2 formed a chemical bond,which effectively improved the redox properties of CeO2.

关 键 词：CeO2/SiO2 复合氧化物 氧化还原性 NO氧化 

分 类 号：TB333[一般工业技术—材料科学与工程] TK425[动力工程及工程热物理—动力机械及工程]