咪唑基介孔有机硅材料固载磷钼酸催化剂的制备及烯烃环氧化性能(英文)  

Electrostatic immobilization of phosphomolybdic acid on imidazolium-based mesoporous organosilicas for catalytic olefin epoxidation

作　　者：王静[1,2] 邹永存[3] 孙渝[2] Maximilian Hemgesberg Dirk Schaffner 高洪成[1] 宋晓静[1] 张文祥[1] 贾明君[1] Wemer R.Thiel 

机构地区：[1]吉林大学化学学院,理论化学计算国家重点实验室,吉林长春130021 [2]凯泽斯劳滕工业大学化学系,德国凯泽斯劳滕67663 [3]吉林大学化学学院,无机合成与制备化学国家重点实验室,吉林长春130012

出　　处：《催化学报》2014年第4期532-539,共8页

基　　金：supported by the China Scholarship Council and the National Natural Science Foundation of China (21173100)~~

摘　　要：以含有咪唑阳离子的周期性介孔有机硅(PMO-ILs)材料为载体,制备了一类固载化磷钼酸(PMA)多相催化材料(PMA@PMO-ILs),并采用N2吸附-脱附实验、X射线衍射、原子吸收光谱、差热-热重分析、红外光谱、紫外光谱及固体核磁共振技术研究了材料的结构及物理化学性质.结果表明,磷钼酸通过静电相互作用被成功固载到PMO-ILs载体表面和孔道中,且在制备过程中磷钼酸及载体基本结构均未发生变化.反应结果表明,PMA@PMO-ILs材料在以叔丁基过氧化氢为氧化剂的环辛烯环氧化反应中表现出一定的催化活性和很高的选择性.中断实验结果表明,催化剂的主要活性中心在反应过程中未发生明显流失,且催化剂经多次循环使用后活性及选择性基本保持不变.PMO-ILs中大量的咪唑阳离子能有效稳定磷钼酸阴离子,使该催化材料表现出良好的稳定性.Polyoxometalate-based heterogeneous materials were prepared by the immobilization of 12-phosphomolybdic acid （PMA） on periodic mesoporous organosilicas containing embedded im-idazolium cations （PMO-ILs）. The resulting hybrid materials （PMA@PMO-ILs） were characterized by N2 adsorption-desorption, powder X-ray diffraction, atomic adsorption spectroscopy, thermo-gravimetric and differential thermal analyses, Fourier transform infrared spectroscopy, ultravio-let-visible diffuse reflectance spectroscopy, and solid-state cross-polarization magic angle spinning nuclear magnetic resonance. PMA was electrostatically immobilized on the surface and in the chan-nels of PMO-ILs. The PMO-IL support and PMA structures were retained during the preparation processes. The catalytic properties of the PMA@PMO-ILs were evaluated for the liquid-phase epox-idation of cyclooctene. PMA@PMO-ILs were catalytically active, with nearly 100% selectivity to cyclooctene epoxide using tert-butyl hydroperoxide as the oxidant. The catalysts could be reused four times without obvious loss of activity or selectivity under identical reaction conditions. Imidaz-olium cations in the PMO-IL framework improved the stability and recyclability of the PMA immobi-lized catalysts.

关 键 词：多金属氧酸盐 介孔有机硅 咪唑阳离子 静电相互作用 环氧化 多相催化 

分 类 号：O643.36[理学—物理化学]