Patent ID: 7387982
Filing Date: 2008-06-17
Classification: B01J,C07C

Abstract:
1. A method of producing an extrusion molding catalyst comprising molybdenum, bismuth and iron, used for the catalytic gas phase oxidation of at least one of propylene, isobutylene, tert-butyl alcohol and methyl-tert-butylether with molecular oxygen, to form at least one of an unsaturated aldehyde and an unsaturated carboxylic acid, the method comprising: drying an aqueous slurry containing molybdenum, bismuth and iron to form dried particles in the form of a sphere; calcining the dried particles at a temperature of from 200 to 600° C. to form calcined particles; adding a liquid to the calcined particles comprising molybdenum, bismuth and iron, to form a first mixture; kneading the first mixture to form a kneaded mixture; carrying out a primary molding of the kneaded mixture to form a molded article, wherein the primary molding is extrusion molding; preserving the molded article for a preserving time; extrusion molding the molded article to form an extrusion molded article; and drying, calcining or both drying and calcining the extrusion molded article; wherein the time from adding the liquid to the calcined particles to immediately before the drying, the calcining or the both drying and the calcining of the preserved molded article is from 1 to 48 hours, and wherein the preserving time is a period of time that is 50% or more of the period of time which the particles are in contact with the liquid.