Abstract
The synthesis of vanadium phosphorus oxide catalysts for the selective oxidation of n-butane using V 2O 4 as a starting material with water as solvent is described. In the absence of added water, V 2O 4 and either H 3PO 4 or H 4P 2O 7 react at 145 °C to form well crystalline VOHPO 4·0.5H 2O. The surface area of the precursor is significantly enhanced when water is added as a solvent. On activation in n-butane/air the catalyst surface area is increased from ca. 4 m 2/g for the precursor to 10–13 m 2/g. The catalytic performance data in terms of n-butane conversion and maleic anhydride selectivity, is comparable to other non-promoted vanadium phosphate catalysts.
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