含MFI结构单元的介孔Ti-HMS-1的合成、表征及催化氧化性能  

Synthesis,Characterization and Catalytic Oxidation Properties of Mesoporous Ti-HMS-1 Containing MFI Structure Unites

作　　者：马乾志[1] 郭杨龙[1] 王艳芹[1] 郭耘[1] 张志刚[1] 卢冠忠[1] 

机构地区：[1]结构可控先进功能材料及其制备教育部重点实验室,华东理工大学工业催化研究所,上海200237

出　　处：《无机材料学报》2007年第5期943-948,共6页Journal of Inorganic Materials

基　　金：国家973计划(2004CB719500);上海市重大基础研究资助项目(06DJ14006)

摘　　要：采用TS-1前驱体作硅源和钛源,以十二胺为模板剂,在中性和室温条件下合成了介孔含钛分子筛Ti-HMS.1.采用XRD、TEM、低温N_2吸附、FT-IR和UV-Vis等方法对合成的分子筛进行了表征;以苯乙烯的催化氧化反应为模型反应,考察了合成的Ti-HMS-1的催化氧化性能.结果表明,Ti-HMS-1具有"worm-like"介孔结构,但长程有序度较低,孔壁部分含有MFI的次级结构单元,在373K沸水中水煮50h后,Ti-HMS-1仍能较好地保持原有的介孔结构,表明Ti-HMS-1具有较高的水热稳定性.进入分子筛骨架的钛原子为催化剂的活性中心,对于苯乙烯氧化反应,具有较高的催化活性,对产物的选择性与Ti-HMS接近。Ti-incorporated Ti-HMS-1 mesoporous molecular sieve was synthesized at ambient temperature by the assembly of TS-1 precursors using dodecylamine （DDA） surfactant as template agent, and characterized by XRD, TEM, nitrogen adsorption, FT-IR, UV-Vis diffuse reflectance. The results show that Ti-HMS-1 prepared consists of the mesoporous structure with Hworm-like holes and MFI structure unites, and the Ti atoms are incorporated into the framework. After treated in the boiling water at 373K for 50h, Ti-HMS-1 remains most of the mesoporous structures, which indicates Ti-HMS-1 has higher hydrothermal stability as compared with Ti-HMS. For the oxidation of styrene using H2O2 as oxidant, the catalytic performance of Ti-HMS-1 is higher obviously than that of Ti-HMS or TS-1. The selectivity of Ti-HMS-1 to products is similar to that of Ti-HMS.

关 键 词：Ti—HMS-1分子筛 合成 表征 苯乙烯氧化 

分 类 号：O643[理学—物理化学]