| 摘要 |
A method for preparing a catalyst which is to be used in producing methacrylic acid from methacrolein by gas-phase catalytic oxidation with molecular oxygen and which contains at least molybdenum and phosphorus as catalyst components, comprising: a step of drying an aqueous mixed fluid that contains raw materials for catalyst components to form a dried substance having an apparent density (X) of 1.00 to 1.80kg/L; and a step of molding the dried substance or a mixture comprising the dried substance to form a molded catalyst that has a density (Y) of 1.60 to 2.40kg/L and an (X)/(Y) ratio of 0.50 to 0.80. |
