Preparation and Catalytic Performance of Phosphotungstic Acid Active Sites Supported on Periodic Mesoporous Organosilica of SBA-15

doi:10.3724/SP.J.1088.2012.11259

Abstract

Abstract: A functionalized periodic mesoporous organosilica (PMO), Bis-PImBr-PMO-SBA-15, incorporated with bridging bis-imidazolium ionic liquid moieties was synthesized via a sol-gel procedure. Keggin-type 12-phosphotungstic acid (H₃PW₁₂O₄₀?xH₂O) was immobilized onto Bis-PImBr-PMO-SBA-15 by the way of anion-exchange, which provided the mesoporous organosilica-supported Keggin-type 12-tungstophosphate catalyst (PW-Bis-PImBr-PMO-SBA-15). X-ray diffraction, N₂ adsorption-desorption, transmission electron microscopy, Fourier transform infrared spectroscopy, and thermal analysis results showed that both Bis-PImBr-PMO-SBA-15 and PW-Bis-PImBr-PMO-SBA-15 maintained the typical characteristics of the mesoporous material, and the Keggin-structure of the 12-phosphotungstate anion was intact after immobilization. The catalytic performance of PW-Bis-PImBr-PMO-SBA-15 in the selective oxidation of benzyl alcohol by 30% H₂O₂ was investigated. The PW-Bis-PImBr-PMO-SBA-15 showed higher catalytic activity than bulk HPW or siliceous SBA-15-supported Keggin-type 12-tungstophosphate catalyst (HPW/SBA-15), the conversion of benzyl alcohol and the selectivity to benzaldehyde were as high as 95% and 94%, respectively. The bis-imidazolium cations were thought to mediate the redox behavior of the Keggin PW₁₂ anions, which in turns enhanced the activity and stability of the catalyst.

Key words: Keggin-type 12-phosphotungstate acid, ionic liquid, periodic mesoporous organosilica, SBA-15 zeolite, benzyl alcohol, catalytic oxidation, hydrogen peroxide

LIU Cheng, TAN Rong, SUN Wen-Qing, YIN Dong-Hong. Preparation and Catalytic Performance of Phosphotungstic Acid Active Sites Supported on Periodic Mesoporous Organosilica of SBA-15[J]. Chinese Journal of Catalysis, 2012, 33(6): 1032-1040.

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