Electrostatic immobilization of phosphomolybdic acid on imidazolium-based mesoporous organosilicas for catalytic olefin epoxidation
Electrostatic immobilization of phosphomolybdic acid on imidazolium-based mesoporous organosilicas for catalytic olefin epoxidation
复制标题
磷钼酸静电固定在咪唑基介孔有机硅上用于催化烯烃环氧化
DOI：
10.1016/s1872-2067(14)60025-5
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发表时间：
2014-04
影响因子：
16.5
通讯作者：
Werner R. Thiel
中科院分区：
文献类型：
--
作者：
Xiaojing Song;Wenxiang Zhang;Mingjun Jia;Werner R. Thiel
将12-磷钼酸(PMA)固定在含咪唑阳离子的周期性介孔有机硅(PMO-ILS)上，制备了多金属氧酸盐非均相材料。对所得杂化材料(PMA@PMO-ILS)进行了氮气吸附-脱附、粉末X射线衍射、原子吸收光谱、热重和差热分析、傅里叶变换红外光谱、紫外-可见漫反射光谱和固态交叉极化魔角旋转核磁共振等表征。PMA被静电固定在PMO-ILS的表面和通道中。在制备过程中保留了PMO-IL载体和PMA结构。考察了PMA@PMO-ILS对环辛烯液相环氧化反应的催化性能。PMA@PMO-ILS具有催化活性，以叔丁基氢过氧化氢为氧化剂，对环氧辛烯的选择性接近100%。在相同的反应条件下，催化剂可重复使用4次，没有明显的活性或选择性损失。PMO-IL骨架中的咪唑阳离子改善了PMA固载化催化剂的稳定性和可回收性。
Polyoxometalate-based heterogeneous materials were prepared by the immobilization of 12-phosphomolybdic acid (PMA) on periodic mesoporous organosilicas containing embedded imidazolium cations (PMO-ILs). The resulting hybrid materials (PMA@PMO-ILs) were characterized by N2adsorption-desorption, powder X-ray diffraction, atomic adsorption spectroscopy, thermogravimetric and differential thermal analyses, Fourier transform infrared spectroscopy, ultraviolet-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 channels 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 epoxidation of cyclooctene. PMA@PMO-ILs were catalytically active, with nearly 100% selectivity to cyclooctene epoxide usingtert-butyl hydroperoxide as the oxidant. The catalysts could be reused four times without obvious loss of activity or selectivity under identical reaction conditions. Imidazolium cations in the PMO-IL framework improved the stability and recyclability of the PMA immobilized catalysts.
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影响因子：
7.3
作者：
Peng Liu;Changhao Wang;Can Li
通讯作者：
Peng Liu;Changhao Wang;Can Li
影响因子：
--
作者：
G. Armatas;Georgios Bilis;M. Louloudi
通讯作者：
G. Armatas;Georgios Bilis;M. Louloudi
影响因子：
3.6
作者：
ISHII, Y;YAMAWAKI, K;OGAWA, M
通讯作者：
OGAWA, M
影响因子：
7.3
作者：
Bordoloi, Ankur;Sahoo, Suman;Halligudi, S. B.
通讯作者：
Halligudi, S. B.
影响因子：
2.7
作者：
Heesoo Kim;J. Jung;D. Park;Joohyung Lee;K. Cho;Sunyoung Park;Sang Hee Lee;I. Song
通讯作者：
Heesoo Kim;J. Jung;D. Park;Joohyung Lee;K. Cho;Sunyoung Park;Sang Hee Lee;I. Song