SBA-15负载CeO_2纳米晶的溶胶-凝胶一步合成  

Synthesis of SBA-15 Loaded CeO_2 Nanocrystals via Sol-gel One-step Process

作　　者：李健生[1] 顾娟[1] 夏敏亚 袁金芳[1] 孙秀云[1] 王连军[1] 

机构地区：[1]南京理工大学环境科学与工程系,南京210094

出　　处：《化学学报》2008年第20期2305-2308,共4页Acta Chimica Sinica

基　　金：高等学校博士学科点专项科研基金(No.20060288008);江苏省自然科学基金(No.BK2006205);南京理工大学青年学者基金(No.NJUST200502)资助项目

摘　　要：以P123为模板剂,正硅酸乙酯和硝酸铈为前驱体,通过溶胶-凝胶路线在酸性条件下合成了SBA-15负载氧化铈(CeO2与SiO2质量比为28.7%)有序介孔材料.采用热重/差热分析(TGA/DTA)、X射线衍射(XRD)、透射电镜(TEM)和氮气吸附等手段对所合成材料进行了表征.结果表明,合成的材料具有类似于SBA-15的结构,孔径、孔容和比表面积分别为38.7,0.46cm3/g和570m2/g.X射线衍射(XRD)、透射电镜(TEM)、X射线能谱(EDS)和选区电子衍射花样联合表征证实了铈物种以高分散的CeO2纳米晶的形式分布在介孔基体中.Ordered mesoporous SBA-15 silica loaded with ceria at a mass ratio of CeO2/SiO2=28.7% was synthesized by a sol-gel route using Pluronic P123 as a template, tetraethyl orthosilicate as a silica source and hydrated cerium nitrite as a precursor under an acidic condition. The as-synthesized materials were characterized by thermogravimetric analysis/differential thermal analysis, X-ray diffraction, transmission electron microscopy, and N2 adsorption. Characterization revealed that the as-synthesized materials possessed an ordered hexagonal mesoporous structure similar to SBA-15. The average pore size, pore volume and specific surface area of the materials is 38.7 A, 0.46 cm^3/g and 570 m^2/g, respectively. The fact that cerium species are present as highly dispersed CeO2 nanocrystals in a hexagonal matrix was confirmed by combined characterization of XRD with high-resolution TEM, selected area electron diffraction analysis and EDS.

关 键 词：合成 介孔 SBA-15 二氧化铈 溶胶-凝胶 

分 类 号：O614.332[理学—无机化学]