| abstract |
PROBLEM TO BE SOLVED: To provide a method for producing a catalyst for producing methacrylic acid having high activity. A in the general formula (I) P a Mo b V c X d Y e O f (I) ( wherein, P, Mo, V and O represent phosphorus, molybdenum, vanadium and oxygen, X is potassium, Rubidium, at least one element selected from cesium and thallium, Y is copper, arsenic, antimony, boron, A, b, c, d, at least one element selected from silver, bismuth, iron, cobalt, lanthanum and cerium; e and f represent the atomic ratio of P, Mo, V, X, Y and O, respectively. In the production of a methacrylic acid production catalyst comprising a Keggin-type heteropolyacid salt having the composition represented by the formula (1), an aqueous solution or an aqueous slurry obtained by mixing the catalyst raw materials in water is dried, and then molded. The body is placed in an inert gas with an oxygen concentration of 500 ppm by volume or less, Bake at 00 ° C. |