Phosphotungstic acid supported on mesoporous carbon as a catalyst for the oxidation of benzyl alcohol |
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| Authors: | Bao Lin Li Jiang Li Xiao Mei Wang Zhuan Xin Wan Liu Chang Wang |
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| Institution: | 1. Key Laboratory of the Ministry of Education for Medicinal Resources and Natural Pharmaceutical Chemistry, and School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi’an, P. R. China
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| Abstract: | Phosphotungstic acid (PTA) was successfully supported on synthesized mesoporous carbon (MC) through impregnating method to yield a series of PTA/MC catalysts, the content of PTA from 16 to 43 wt %. The catalysts were characterized by FTIR spectroscopy, X-ray diffraction, N2 adsorption-desorption isotherm tests and transmission electron microscopy. The characterization data revealed that intact Keggin ion of PTA is kept in the support, and PTA is located equably inside the pores of MC. The catalytic activities of these catalysts were tested in selective oxidation of benzyl alcohol to benzaldehyde using 30% hydrogen peroxide as oxidant. The results indicated that 28 wt % PTA/MC catalyst with high specific surface area (474 m2/g) and uniform pore size (6.4 nm) possess the best catalytic activity (conversion of 82.6% and selectivity of 94.0%) among all prepared catalysts. |
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