A new method for the synthesis of molybdovanadophosphoric heteropoly acids and their catalytic activities

2007, Volume 1, Issue 3

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Frontiers of Chemical Science and Engineering >> 2007, Volume 1, Issue 3 doi: 10.1007/s11705-007-0054-0

A new method for the synthesis of molybdovanadophosphoric heteropoly acids and their catalytic activities

Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China;

Available online: 2007-09-05

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Abstract

An environmentally benign method for the synthesis of heteropoly acids HPMoVO·HO (PMoV, = 1−3) was developed by the reaction of an aqueous slurry which contained stoichiometric amounts of MoO, VO and HPO. Characterization of the as-synthesized catalysts with inductively coupled plasma (ICP) elemental analysis, thermogravimetry (TG), X-ray diffraction (XRD) and infrared (IR) spectroscopy indicated that V ions substituted for Mo ions in Keggin-type phosphomolybdic acid. The as-synthesized samples were found to be an efficient catalyst for the hydroxylation of benzene which was carried out in a mixed solvent of acetonitrile and acetic acid with aqueous hydrogen peroxide as oxidant. PMoV exhibi ted the highest benzene conversion of 34.5% with phenol selectivity of 100%.

Keywords

conversion ; heteropoly ; Characterization ; efficient catalyst ; Keggin-type phosphomolybdic

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