Patent ID: 8252714

Claim:
A method for producing a catalyst for use in the production of an unsaturated aldehyde and/or an unsaturated carboxylic acid, said catalyst comprising a mixed oxide comprising molybdenum, bismuth and iron, said method comprising the steps of: (1) drying an aqueous solution or an aqueous slurry containing raw materials of the catalyst and then calcining a dried product in a molecular oxygen-containing gas atmosphere to obtain a calcined product; (2) heating the calcined product obtained in Step (1) in the presence of a reducing material to obtain a reduced product having a mass loss, represented by the following equation (I), of 0.05 to 6%: Mass loss (%)=[( Wa−Wb )/ Wa ]×100 (I) in which Wa is a weight of a calcined product before the reduction treatment, and Wb is a weight of a reduced product after the reduction treatment; and (3) calcining the reduced product obtained in Step (2) in a molecular oxygen-containing gas atmosphere.