| abstract |
A catalyst for producing methacrylic acid capable of producing methacrylic acid with high selectivity, a method for producing the same, and a method for producing methacrylic acid using the catalyst. An aqueous slurry or aqueous solution containing a heteropolyacid is prepared by adding at least a molybdenum element raw material and an X element raw material in water, an alkali metal compound is added to the aqueous slurry or aqueous solution, and the heteropolyacid is added. After depositing a heteropolyacid salt at least partly of an alkali metal salt, by adding a raw material of phosphorus element, phosphorus element, molybdenum element, X element (from silicon, titanium, germanium, arsenic, antimony and cerium) When producing a catalyst containing at least one element selected from the group) and an alkali metal element, the amount of nitrate, carbonate and ammonium radicals in an aqueous slurry or aqueous solution containing all raw materials is a specific condition. The catalyst which satisfy | fills is satisfy | filled and it uses for manufacture of methacrylic acid. [Selection figure] None |