Patent ID: 6346647
Filing Date: 2002-02-12
Classification: B01J,C07C

Abstract:
A process for the production of acrylic acid by a vapor phase catalytic oxidation of propane using a metal oxide catalyst comprising Mo, V, Sb and A (A represents Nb or Ta), the catalyst being obtained by a method comprising the following steps (1) and (2):(1) a step of reacting V+5 and Sb+3 at a temperature of 70Â° C. or higher in the presence of Mo+6 in an aqueous medium, and bubbling an oxygen-containing gas into the reaction mixture during or after the reaction; and (2) a step of adding to the reaction product obtained in step (1) a solution containing a compound comprising A and an aqueous solution of nitric acid or ammonium nitrate, uniformly stirring these components, and then calcining the resulting mixture.