| abstract |
(57) [Summary] [Object] To provide a highly active and highly selective catalyst for a fluidized bed having sufficient strength and an appropriate bulk density, and a method for producing an aromatic carboxylic acid anhydride using the catalyst. A fluidized bed catalyst for vapor phase catalytic oxidation of aromatic hydrocarbons containing titanium oxide, a vanadium compound, an alkali metal compound and a sulfuric acid compound as essential components and containing 1 to 50% by weight of crystalline aluminosilicate (zeolite). further, It may contain at least one of silica, boron oxide, and an oxide of phosphorus and an oxide of a rare earth metal. Aromatic hydrocarbons and oxygen-containing gas are used as raw materials using this catalyst, and gas phase catalytic oxidation is performed in a fluidized bed to produce an aromatic carboxylic acid anhydride. |