| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a catalyst for producing methacrylic acid at high selectivity, a method for producing the same and a method for producing methacrylic acid by using the catalyst. <P>SOLUTION: The method for producing the catalyst for producing methacrylic acid comprises the steps of: adding a molybdenum raw material and a raw material of an X element, at the least, into water to prepare the heteropolyacid-including aqueous slurry or solution; adding an alkali metal compound to the prepared aqueous slurry or solution to precipitate the alkali metal salt which is obtained from a part of the heteropolyacid, as a salt of the heteropolyacid; and thereafter adding a phosphorus raw material and keeping the temperature of the slurry at ≤70°C to produce the catalyst including a phosphorus element, a molybdenum element, the X element (at least one element selected from the group consisting of silicon, titanium, germanium, arsenic, antimony and cerium) and an alkali metal element. The produced catalyst is used for producing methacrylic acid. <P>COPYRIGHT: (C)2011,JPO&INPIT |
