Patent ID: 6180825
Filing Date: 2001-01-30
Classification: B01J,C07C

Abstract:
An improved process for preparing an unsaturated aldehyde or carboxylic acid comprising subjecting an alkane to catalytic oxidation in the presence of a catalyst including a compound having the formulaA.sub.a M.sub.m N.sub.n X.sub.x O.sub.owherein 0.25<a<0.98, 0.003<m<0.5, 0.003<n<0.5, 0.003<x<0.5 and o is dependent on the oxidation state of the other elements, A is Mo, W, Fe, Nb, Ta, Zr, Ru or mixtures thereof, M is V, Ce, Cr or mixtures thereof, N is Te, Bi, Sb, Se or mixtures thereof, and X is Nb, Ta, W, Ti, Al, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ni, Pd, Pt, Sb, Bi, B, In, Ce or mixtures thereof, wherei the improvement comprises said catalyst having been prepared by the process comprising:(A) admixing metal compounds, at least one of which is an oxygen containing compound, and at least one solvent to form a solution;(B) removing said at least one solvent from said solution by the application of heat and vacuum pressure to said solution, to obtain a catalyst precursor;and (C) calcining said catalyst precursor at a temperature from 350.degree. C. to 850.degree. C. under an inert atmosphere, wherein the inert atmosphere is not flowing over said catalyst precursor, to form said catalyst including a compound having the formulaA.sub.a M.sub.m N.sub.n X.sub.x O.sub.owherein 0.25<a<0.98, 0.003<m<0.5, 0.003<n<0.5, 0.003<x<0.5 and o is dependent on the oxidation state of the other elements, and A is Mo, W, Fe, Nb, Ta, Zr, Ru or mixtures thereof, M is V, Ce, Cr or mixtures thereof N is Te, Bi, Sb, Se or mixtures thereof, and X is Nb. Ta, W, Ti, Al, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ni, Pd, Pt, Sb, Bi, B, In, Ce or mixtures thereof.