Journal of Catalysis p. 253 - 260 (1995)
Update date:2022-08-11
Topics:
Sananes, M. T.
Hutchings, G. J.
Volta, J. C.
The catalytic role of VO(H2PO4)2, the precursor of the V O(PO3)2 phase, has been studied for n-butane oxidation to maleic anhydride.By comparison with the activated VPO catalyst, derived from the VOHPO4*0.5H2O precursor phase, VO(H2PO4)2 gives a highly selective final catalyst.The total oxidation products CO and CO2 are not observed under any of the conditions examined, a result confirmed by extensive catalyst testing and carbon mass balances.The final catalyst derived from VO(H2PO4)2 has a low surface area, ca. 1 m2/g, and consequently demonstrates low specific activity on the basis of n-butane conversion per unit mass.However, the interinsic activity (activity per unit surface area) is found to be higher than that for catalysts derived from VOHPO4 * 0.5H2O.Since some VO(H2PO4)2 is present in VOHPO4 * 0.5H2O, which is the precursor of the industrial catalyst, the results of this study complicate the simple model in which the (VO)2P2O7 phase derived from VOHPO4 * 0.5H2O is responsible for the selective oxidation of n-butane.The observation that the precursor VO(H2PO4)2 can generate catalysts of high specific activity and of total selectivity to partial oxidation products might provide a useful insight into the design of a new series of high activity and high selectivity partial oxidation catalysts.
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