Mixed V/Sb/Sn oxide ammoxidation catalysts
AssigneeRhone-Poulenc Chimie
InventorsStefania Albonetti, Gilbert Blanchard, Paolo Burattin, Fabrizio Cavani, Ferruccio Trifiro
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Abstract
Vanadium/antimony/tin mixed oxides having the empirical formula (I): VSb.sub.a Sn.sub.b O.sub.x (I) exhibit an X-ray diffraction pattern characteristic of a crystallographic phase of rutile SnO.sub.2, are well suited as catalysts for the vapor phase ammoxidation of alkanes, and are conveniently prepared by (a) dissolving respective compounds of vanadium, antimony and tin in at least one saturated alcohol, (b) intimately contacting the alcoholic solution thus obtained with an aqueous solution containing an ammonium salt, thus precipitating the mixed oxides therefrom, and (c) separating and calcining these mixed oxides.
Claims17
A process for the preparation of a vanadium/antimony/tin mixed oxide having the empirical formula:
- VSb.sub.a Sn.sub.b O.sub.x (I)
- in which a is a whole or fractional number equal to or greater than 0.1, b is a whole or fractional number equal to or greater than 0.5 and x is a whole or fractional number determined by the oxidation states of the other elements, said mixed oxide exhibiting an X-ray diffraction pattern characteristic of a crystallographic phase of rutile SnO.sub.2 comprising (a) dissolving respective compounds of vanadium, antimony and tin in at least one saturated alcohol, (b) intimately contacting the alcoholic solution thus obtained with an aqueous solution containing an ammonium salt, thus precipitating said mixed oxides therefrom, and (c) separating and calcining this mixed oxide.
An atomoxidation catalyst comprising, as the active catalytic phase therefor, a catalytically effective amount of the V/Sb/Sn mixed oxide prepared in accordance with the process of claim 11.
Dependencies are inferred from the claim text.