Patent ID: 6486091
Filing Date: 2002-11-26
Classification: B01J,C07C,Y02P

Abstract:
A method for preparing a catalyst for olefin ammoxidation, comprising bismuth, molybdenum, vanadium, antimony, and niobium, comprising the steps of:(a) preparing a vanadium antimonate phase by heating a slurry of vanadium oxide and antimony oxide thereby forming a vanadium-antimony paste and subsequently drying the paste and calcining it to form said vanadium antimonate phase; (b) preparing a niobium-molybdenum solution by mixing niobium oxide hydrate and molybdenum oxide hydrate in water; (c) preparing bismuth, niobium, and molybdenum mixed oxide hydrates by adding bismuth to the niobium-molybdenum solution of step (b); (d) combining said vanadium antimonate phase, said bismuth, niobium and molybdenum mixed oxide hydrates and a support thereby forming a catalyst precursor mixture, wherein said mixed oxide hydrates are not subjected to heat treatment prior to forming said catalyst precursor mixture; (e) stirring the catalyst precursor mixture for a period of time sufficient to form a catalyst precursor paste; and (f) drying said catalyst precursor paste to form a dried catalyst precursor material and calcining said dried catalyst precursor material to form said catalyst.