Patent ID: 7304180

Claim:
A process for producing a metal oxide catalyst represented by the following composition formula, comprising the following step (1), step (2), step (3) and step (4): Step (1): grinding metal A to a fine particle dispersion in the presence of water without any of Mo 6+ compounds and V 5+ compounds to obtain an aqueous dispersion or grinding metal A to a fine particle dispersion in the presence of an organic solvent without any of Mo 6+ compounds and V 5+ compounds to obtain an organic solvent dispersion; Step (2): adding a Mo 6+ compound and a V 5+ compound to said aqueous dispersion obtained in step (1) and heating to obtain a reaction liquid, or in the case where an organic solvent dispersion has been obtained in the step (1), substituting water for the organic solvent to obtain an aqueous dispersion and then adding a Mo 6+ compound and a V 5+ compound to the aqueous dispersion and heating to obtain a reaction liquid; Step (3): adding metal B to the reaction liquid obtained in the step (2) to obtain a mixed liquid; and Step (4): evaporating to dryness and calcining the mixed liquid obtained in step (3) to obtain the composition formula: MoV i A j B k O y Composition formula: wherein A is Te or Sb; B is at least one element selected from the group consisting of Nb, Ta, W, Ti, Zr, Re, Fe, Ni, Co, Sn, Tl, Cu, rare earth elements, and alkali metal elements; i and j are each from 0.01 to 1.5, and j/i is from 0.3 to 1.0; k is from 0.001 to 3.0; and y is the number to be determined by the oxidation state of other elements.