Process for the preparation of ammoxidation catalysts

摘要

The prepn. of a mixed oxide comprising V, Sb and Sn of the general formula:- VSbaSnbOx -a = 0.1 or more (whole or fractional numbers) -b = 0.5 or more (whole or fractional numbers). -x = whole or fractional number determined by degree of oxidn. of other elements. The mixed oxide has an X ray diffraction pattern consistent with a crystallographic phase of SnO2 rutile structure. The cpd. is prepared in the following stages:- cpds. of V, Sb and Sb are dissolved in at least one satd. alcohol. -the alcoholic soln. obtd. is contacted with an aq. soln. contg. an ammonium salt, to precipitate the mixed oxide. -the oxide is separated and calcined. Also claimed is a process of ammoxidation of 8-12C alkanes, using the prepared catalyst.