微波法直接合成Ce/SBA-15介孔分子筛  

Direct Synthesis and Characterization of Cerium-Incorporated SBA-15 Mesoporous Molecular Sieve

作　　者：陈国倩[1] 蔡国辉[2] 肖益鸿[2] 郑瑛[1,2] 

机构地区：[1]福建师范大学化学与材料学院,福建福州350007 [2]福州大学化肥催化剂国家工程研究中心,福建福州350002

出　　处：《中国稀土学报》2008年第6期714-718,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金(20576021);福建省自然科学基金计划(E0710004)资助项目

摘　　要：以三嵌段共聚物(P123)作为模板剂,正硅酸乙酯(TEOS)为硅源,利用溶胶凝胶法,在微波条件下快速地将Ce金属离子直接掺杂到SBA-15介孔分子筛骨架中。通过X射线粉末衍射(XRD)、傅立叶变换红外(FT-IR)、紫外可见漫反射(UV-Vis)、透射电镜(TEM)和N2的等温吸附-脱附法等手段对合成的样品进行表征。结果表明:稀土Ce金属离子以Ce3+,Ce4+两种价态存在于SBA-15介孔分子筛中。合成的Ce/SBA-15分子筛具有规则六方孔道结构,较高的比表面积和孔容(分别为714.85 m2.g-1和0.67 cm3.g-1),其孔半径主要集中在1.8 nm。Using P123 as a template and TEOS as a source of silica, Ce-silica mesoporous SBA-15-type material was synthesized rapidly via microwave technique and characterized by XRD, FT-IR, DRS and low temperature N2 adsorption-desorption measurements. The results showed that Ce was successfully incorporated into the framework of SBA-15 molecular sieve with the valence of three and four. The synthesized material not only retained the hexagonal order and physical properties of purely siliceous SBA-15 but also possessed the high surface area and the narrow pore-size distribution （714. 85 m2·g^-1 and 0. 67 cm3·g^-1, respectively）. The pore size distribution of Ce/SBA-15 was concentrated at a radius of 1.8 nm.

关 键 词：溶胶-凝胶 掺杂 Ce/SBA-15 介孔分子筛 微波 稀土 

分 类 号：TQ426.8[化学工程]