Patent ID: 6429332
Filing Date: 2002-08-06
Classification: B01J

Abstract:
A catalyst for producing acrylic acid by the oxidation of acrolein or acrolein-containing gas in a vapor phase with a molecular oxygen-containing gas, which catalyst comprises (A) a composite oxide having molybdenum and vanadium as essential components and adapted for the production of acrylic acid by the vapor-phase catalytic oxidation of acrolein and (B) a solid acid having acid strength (Ho) of not more than âˆ’11.93 (Ho &lE;âˆ’11.93),wherein said component (A) is a composite oxide represented by the following general formula (1): MoaVbWcCudXeOg, wherein Mo is molybdenum, V is vanadium, W is tungsten, Cu is copper, X is at least one element selected from the group consisting of Mg, Ca, Sr and Ba, and O is oxygen, and a, b, c, d, e and g are atomic ratios respectively of Mo, V, W, Cu, X and O such that b is a numeral in the range of 2 to 14, c is in the range of 0 to 12, d is in the range of 0 to 6 excluding 0 (0