CeO_2纳米粒子的自组装结构合成、表征及催化特性  

Self-assembly structure of CeO_2 nanoparticles: synthesis, characterization and catalytic property

作　　者：张亚辉[1] 齐兴义[1] 郭林[1] 张琦[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100083

出　　处：《北京航空航天大学学报》2004年第10期1021-1024,共4页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金资助项目 ( 90 2 0 60 3 2 )

摘　　要：利用微乳液方法 (以AOT为表面活性剂 )自组装合成了叶脉状结构的CeO2 (氧化铈 )纳米粒子 ;使用X射线衍射仪 (XRD)、透射电子显微镜 (TEM)、括展X射线精细结构 (EXAFS)对其进行了研究表征 ;并对其催化特性进行了测试 .XRD结果表明CeO2 纳米粒子为立方面心结构 ;EXAFS结果表明与体相CeO2 微粒相比 ,Ce-O键长变长 ,Ce原子周围O原子配位数降低 ;催化特性研究结果表明 ,相对于体相材料 ,CeO2 纳米微粒的催化分解H2 O2An approach to synthesis of self-assembly CeO2 nanoparticles by using microemulsion method was investigated. The structure of the product was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and extended X-ray absorption fine structure (EXAFS). XRD indicates the face-center cubic (FCC) structure of the produced CeO2 nanoparticles. EXAFS shows that the oxygen coordination number around Ce in CeO2 nanoparticles decrease as compared with the bulk CeO2, and the bond-length of Ce-O in CeO2 nanoparticles is obviously longer than that of bulk materials. The catalytic property of CeO2 on the decomposition of H2O2 was investigated, and the results demonstrate that CeO2 nanoparticles have much stronger catalytic activity than bulk CeO2.

关 键 词：氧化铈 合成 微乳液 自组装结构 

分 类 号：O611.4[理学—无机化学]