OXIDE CATALYST, PROCESS FOR PRODUCTION OF OXIDE CATALYST, PROCESS FOR PRODUCTION OF UNSATURATED ACID, AND PROCESS FOR PRODUCTION OF UNSATURATED NITRILE

摘要

A process for producing an oxide catalyst for use in, for example, a gas-phase catalytic oxidation reaction of propane or the like, which comprises (I) a step of preparing a preparation solution containing a compound of Mo, a compound of V, a compound of Nb and a compound of Sb or Te at a specified ratio in terms of the contents of atoms of the elements, (II) a step of drying the preparation solution to produce a dried powder, and (III) a step of burning the dried powder, wherein the step (III) comprises a step of burning the dried powder in the co-presence of a solid material of a W-containing compound to produce a pre-burned powder or a burned powder or a step of burning the dried powder to produce a pre-burned powder and burning the pre-burned powder in the co-presence of the solid material to produce the burned powder, the solid material fulfils predetermined requirements, and the oxide catalyst comprises a catalyst component having a predetermined chemical composition.