| abstract |
The present invention is an oxide catalyst used for the oxidation reaction of olefins and / or alcohols, and includes molybdenum, bismuth, iron, cobalt and cerium, and the atomic ratio (a) of bismuth to 12 atoms of molybdenum is 2 ≦ a ≦ 6, The atomic ratio (b) of iron is 2.5 <b≤5, the atomic ratio (c) of cobalt is 2≤c≤8, the atomic ratio (d) of cerium is 0.5≤d≤6, and the atomic ratio of iron / cobalt is 0.4≤ An oxide catalyst having a change rate of d of 5000 ppm to 9000 ppm based on the surface spacing (d) of the complex oxide of cerium and molybdenum having b / c ≦ 2.5 and peaking at 33.50 ° in X-ray diffraction was used. to provide. |