| 摘要 |
A method of preparing methacrolein and/or methacrylic acid by catalytic gas phase oxidation of isobutane in the presence of a catalyst, wherein said catalyst is a catalyst containing divanadyl pyrophosphate and represented by general formula (1) PaVbXcYdZeOx(1) wherein P, V, and O represent phosphorus, vanadium and oxygen, respectively; X represents at least one element selected from the group consisting of cobalt and nickel; Y represents at least one element selected from the group consisting of niobium, tantalum, manganese, iron, copper, zinc, lanthanum, neodymium, samarium, cerium, zirconium, chromium, magnesium, tungsten, tin, hafnium, uranium, indium, cadmium, molybdenum, antimony, bismuth, rhodium, silver and sulfur; Z represents at least one element selected from the group consisting of potassium, rubidium, cesium and thallium; a, b, c, d, e, and x represent atomic ratios, respectively, provided that when a is 1, b is 0.2 to 2, c is 0.01 to 5, d is 0 to 5, and e is 0 to 2, and x represents number of oxygen atoms necessary for satisfying atomic valences of respective component elements.
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