| abstract |
PROBLEM TO BE SOLVED: To produce a catalyst used in a method for producing a corresponding unsaturated aldehyde or unsaturated carboxylic acid from propylene, isobutylene, t-butyl alcohol or the like as a raw material, a method for producing 1,3-butadiene from butenes, or the like. To provide a catalyst with high catalytic activity and high yield of target product. SOLUTION: The sum (S) of the peak intensity ratios expressed by the following formulas in an X-ray diffraction pattern obtained by containing molybdenum, bismuth and cobalt as essential components and using CuKα rays as an X-ray source is 42 or more and 113 or less. A catalyst characterized by being. S = {(peak intensity of 2θ = 14.1 ± 0.1 °) + (peak intensity of 2θ = 25.4 ± 0.1 °) + (peak intensity of 2θ = 28.5 ± 0.1 °) } ÷ (peak intensity of 2θ = 26.5 ± 0.1 °) × 100 [Selection diagram] Fig. 1 |