Patent ID: 8586786
Filing Date: 2013-11-19
Classification: B01J,C07C

Abstract:
1. A method for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid, comprising the steps of: (1) drying an aqueous solution or an aqueous slurry containing raw materials of a 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%: 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 to obtain a catalyst comprising a mixed oxide comprising molybdenum, bismuth and iron, and (4) performing a gas phase catalytic oxidation of at least one compound selected from the group consisting of propylene, isobutylene and tertbutyl alcohol with molecular oxygen in the presence of the catalyst produced in step (3).