Patent ID: 7579297

Claim:
A method for producing a catalyst comprising at least molybdenum, bismuth and iron for use in producing an unsaturated aldehyde and an unsaturated carboxylic acid through gas-phase catalytic oxidation of propylene, isobutylene, tertiary butyl alcohol or methyl tertiary butyl ether with molecular oxygen, comprising the steps of: kneading particles comprising catalyst components, an organic binder and a liquid to form a kneaded mixture; and extrusion molding the kneaded mixture, wherein the organic binder comprises at least a high-viscosity organic binder having a viscosity of from 5,000 mPa·s to 25,000 mPa·s and a low-viscosity organic binder having a viscosity of from 10 mPa·s to less than 5,000 mPa·s, wherein viscosity is measured with a 1% by mass water solution or dispersion of the binder at 20° C.