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

doi:10.1016/S1872-2067(14)60025-5

Abstract

Abstract:

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 N₂ adsorption-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 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. Imidazolium cations in the PMO-IL framework improved the stability and recyclability of the PMA immobilized catalysts.

Key words: Polyoxometalate, Mesoporous organosilica, Imidazolium cation, Electrostatic interaction, Epoxidation, Heterogeneous catalysis

Jing Wang, Yongcun Zou, Yu Sun, Maximilian Hemgesberg, Dirk Schaffner, Hongcheng Gao, Xiaojing Song, Wenxiang Zhang, Mingjun Jia, Werner R. Thiel. Electrostatic immobilization of phosphomolybdic acid on imidazolium-based mesoporous organosilicas for catalytic olefin epoxidation[J]. Chinese Journal of Catalysis, 2014, 35(4): 532-539.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(14)60025-5

https://www.cjcatal.com/EN/Y2014/V35/I4/532

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