| 摘要 |
The invention provides a process for industrially and advantageous production of methacrolein and methacrylic acid which comprises subjecting isobutylene or tert-butanol to gas phase catalytic oxidation with a molecular oxygen-containing gas in the presence of a catalyst having the composition represented by the following formula: MoaWbBicFedSbeCrfSigAhXiYjZkOl wherein Mo, W, B, Fe, Sb, Cr, Si and O represent molybdenum, tungsten, bismuth, iron, antimony, chromium, silicon and oxygen, respectively; A represents at least one element selected from the group consisting of nickel and cobalt; X represents at least one element selected from the group consisting of potassium, rubidium, cesium and thallium; Y represents at least one element selected from the group consisting of magnesium, zinc, manganese, cadmium, lead and barium; Z represents at least one element selected from the group consisting of phosphorus, boron, sulfur, chlorine, cerium, tin and titanium; a, b, c, d, e, f, g, h, i, j, k and l each represents atomic ratio of each element; and when a is 12, b is 0.01-2, c is 0.01-3, d is 0.5-4, e is 0.01-3, f is 0.01-3, g is 1-20, h is 1-12, i is 0.01-2, j is 0.01-5 and k is 0-3 and l is the number of oxygen atom necessary to satisfy valence of each of said component.
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