Novel vanadium phosphate phases as catalysts for selective oxidation |
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Authors: | Arunabha Datta Monika Agarwal and Soumen Dasgupta |
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Institution: | (1) Indian Institute of Petroleum, 248 005 Dehra Dun, India |
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Abstract: | In our effort to induce novel modifications in the structure of some important vanadium phosphate phases used as selective
oxidation catalysts, it has been observed that metal ions such as Zn2+, Ni2+, Pd2+can be incorporated into the vanadyl hydrogen phosphate VOHPO40.5H2O phase in very different ways depending upon the medium of preparation. It has been found that the metal ions are either
substituted into the lattice with retention of structure of the parent compound or intercalated between the layers of a new
mixed-valent phase. These new metal-incorporated phases are catalytically active and the palladium incorporated compound in
particular displays shape selective catalysis for different oxidation and reduction reactions. In another approach, the preparation
of VOHPO40.5H2O) has been modified to give a novel crystalline phase containing mixed-valentvanadium and having NH3 species bound to the lattice. This phase could be a potential catalyst for ammoxidation reactions. In addition, novel mesostructured
vanadium phosphate phases have been prepared using a long-chain amine as the templating agent involving a ligand templating
mechanism of formation. |
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Keywords: | Vanadium phosphate selective oxidation structure modification |
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