abstract |
PROBLEM TO BE SOLVED: To provide a method for producing acrylic acid by suppressing the by-product of propionic acid when oxidizing acrolein-containing gas to produce acrylic acid. SOLUTION: The acrolein-containing gas is converted into the following (1) to (4) A method for producing acrylic acid, comprising oxidizing with molecular oxygen in the presence of a composite oxide catalyst containing each element. (1) molybdenum, (2) vanadium and / or niobium, (3) antimony, (4) lead |