介孔硅负载Keggin型钨磷酸催化环己烯环氧化(英文)  

Catalytic epoxidation of cyclohexene over mesoporous‐silica immobilized Keggin‐type tungstophosphoric acid

作　　者：蔡雯佳[1] 周琰[1] 包任烈[1] 岳斌[1] 贺鹤勇[1] 

机构地区：[1]复旦大学化学系,上海市分子催化和功能材料重点实验室,上海200433

出　　处：《催化学报》2013年第1期193-199,共7页

基　　金：supported by the National Basic Research Program of China (973 Program, 2009CB623506);the National Natural Science Foundation of China (21173050);Shanghai Leading Academic Discipline Project (B108)~~

摘　　要：采用共合成法制备了一系列不同硅氨基含量的介孔氧化硅SBA-15,在其孔道中引入Keggin型钨磷酸,且其含量随硅氨基含量的增加而增加. 考察了不同处理温度下杂多酸的热稳定性,发现焙烧后钨物种能在SBA-15孔道内高度分散. 以H2O2为氧化剂,研究了该催化剂在环己烯环氧化反应中的催化活性,考察了杂多酸负载量和焙烧温度对催化活性的影响. 结果表明,400 C处理后的钨磷酸催化剂具有高的反应活性和重复使用性能.A series of aminosilylated mesoporous silica（SBA‐15） samples with different contents of（3‐aminopropyl）triethoxysilane（APTES）,synthesized using a simple one‐pot method,were used as hosts for immobilization of Keggin‐type 12‐phosphotungstic acid（H3PW12O40）.The loading of H3PW12O40 increased with increasing content of grafted APTES.The obtained materials were calcined at different temperatures,and the tungsten species were highly dispersed inside the SBA‐15 channels.The catalytic activities of these samples were tested in heterogeneous oxidation of cyclohexene using H2O2 as the oxidant.The effects of different loadings and treatment temperatures on the activities of the catalysts were also investigated.The catalysts calcined at 400°C showed high catalytic activities and reusabilities.

关 键 词：12-磷钨酸 硅氨基化 SBA-15 环氧化 环己烯 

分 类 号：O643.32[理学—物理化学]