CATALYST FOR PRODUCING ACRYLIC ACID, AND METHOD FOR PRODUCING ACRYLIC ACID BY USING CATALYST

摘要

PROBLEM TO BE SOLVED: To provide a catalyst which is excellent in catalytic activity, catalytic performance such as selectivity, and service life and exhibits stable performance over a long period of time when used for producing acrylic acid from propane and/or acrolein.SOLUTION: The catalyst contains molybdenum, vanadium and antimony as essential components and is used for producing acrylic acid by a catalytic vapor-phase oxidation reaction of propane and/or acrolein in the presence of molecular oxygen or molecular oxygen-containing gas. In a Cu-Kα beam-used X-ray diffraction analysis of a catalytically active component thereof, a ratio I(25.0°)/I(22.2°) of the peak intensity at the diffraction angle 2&thetas;=22.2°±0.3° to that at the diffraction angle 2&thetas;=25.0°±0.3° is equal to or larger than 0.1 and smaller than 0.7.