| abstract |
(57) Abstract: [PROBLEMS] To provide a catalyst for producing methacrylic acid, which has higher reaction activity, selectivity and longer catalyst life than ever before. A general formula PaMobVcSbdCueX A partially neutralized salt of a heteropoly acid represented by fOg, Among the catalyst raw materials, the catalyst raw materials excluding the vanadium raw material and / or the antimony raw material are mixed and dissolved or suspended in water, and 80 to 200 ° C in the presence of ammonium root. After the heat treatment at the temperature of 1 to 24 hours, the vanadium raw material and / or the antimony raw material are added, and the mixture is heated again to 80 to 2 Heat treatment is performed at a temperature of 00 ° C. for 1 to 24 hours, and then firing is performed. |