Abstract
A series of molybdovanadophosphoric acid (MVPA) supported on mesoporous silica was synthesized by an incipient wetness impregnation method. The catalysts were characterized by nitrogen adsorption–desorption, X-ray powder diffraction, Fourier-Transform Infra red spectroscopy (FT-IR), UV–Vis Diffused reflectance spectroscopy (UV–Vis DRS), Temperature programmed reduction (TPR) and 31P MAS Nuclear magnetic resonance(NMR) study. The characterization data reveals the incorporation of vanadium in phosphomolybdic acid and retention of intact Keggin ion on the support. The catalytic activities were evaluated for oxidation of benzaldehyde using molecular oxygen as oxidant as the new green reaction system. Among all the promoted catalysts, 50wt% molybdovanadophosphoric acid supported on MCM-41 exhibits highest catalytic activity in oxidation of benzaldehyde, giving 95% conversion. Other oxidants like H2O2 and tert-butyl hydrogen peroxide (TBHP) were also tested for benzaldehyde oxidation reaction.
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Acknowledgments
The authors are thankful to Prof. B. K. Mishra, Director, Institute of Minerals and Materials Technology (CSIR), Bhubaneswar for the constant encouragement and permission to publish this paper. Mr. Surjyakanta Rana and Mrs. Sujata Mallick are obliged to CSIR for a senior research fellowship and research associate ship, respectively.
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Rana, S., Mallick, S. & Parida, K.M. Selective oxidation of benzaldehyde by molecular oxygen over molybdovanadophosphoric acid supported MCM-41. J Porous Mater 19, 397–404 (2012). https://doi.org/10.1007/s10934-011-9487-4
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DOI: https://doi.org/10.1007/s10934-011-9487-4