Patent ID: 9675966
Date: 2017-06-13
CPC Classifications: B01J

Claim:
1. A process for the preparation of a promoted VPO catalyst, wherein the catalyst comprises the mixed oxides of vanadium and phosphorus and wherein the catalyst is promoted with niobium and at least one of antimony and bismuth, said process comprising the steps of (i) preparing a VPO catalyst comprising vanadyl pyrophosphate as the major component and containing less than 5 wt % of vanadyl phosphate, (ii) impregnating the VPO catalyst with a metal source compound of niobium and a metal source compound of at least one of antimony and bismuth, to form a metal impregnated VPO catalyst, and (iii) drying the metal impregnated VPO catalyst to form the promoted VPO catalyst.