V/ SBA-15分子筛的制备及其对乙苯制苯乙酮反应的催化性能

Preparation of V/SBA-15 Molecular Sieve and Catalytic Performance in Ethylbenzene-to Acetophenone Reaction

摘要:

摘 要：以P123(三嵌段共聚物)为模板剂，正硅酸乙酯为硅源，柠檬酸氧钒配合物为前驱体，采用水热法在酸性条件下一步制备了V/SBA-15有序介孔材料。系统研究了不同晶化时间、模板剂用量等因素对介孔分子筛V/SBA-15制备的影响。实验结果表明:最优晶化时间为96h、模板剂用量n=1.0，此条件下所制备的材料具有类似于分子筛SBA-15高度有序的六方介孔结构，且活性组分钒在介孔氧化硅基体中均匀分散。利用XRD、FT-IR及BET等方法对制备的分子筛V/SBA-15进行结构表征，同时在乙苯制苯乙酮反应中以苯乙酮选择性及收率来验证催化剂的催化性能。结果表明：在催化氧化乙苯制苯乙酮反应较优工艺条件下，苯乙酮选择性及收率分别为82.65%和38.96%。

Abstract:

Abstract：The ordered mesoporous materials V/SBA-15 was prepared by hydro-thermal method under the acidic conditions using P123(tri-block copolymer) as template, tetraethoxysilane(TEOS) as silicon source, citric acid vanadyl complexes as precursors. The influence factors of preparation mesoporous molecular sieves V/SBA-15 including the different crystallization time and the dosage of template agent were systematically investigated. The experimental results showed that under the optimum condition such as the crystallization time 96h and dosage of template agent n=1.0, V/SBA-15 remains a highly ordered two-dimensional hexagonal pore structure of SBA-15, and the load of active ingredient metal vanadium oxide uniformly distributed on the surface of mesoporous. The structure of V/SBA-15 was characterized by the XRD, BET, FT-IR, meanwhile, the catalytic performances were verified by the selectivity and yield of acetophenone in the oxidation of ethyl-benzene to acetophenone reaction. The results displayed under the optimum condition of catalyzation oxidation ethyl-benzene to acetophenone, the selectivity and yield of acetophenone are 82.65% and 38.96%, respectively.