CATALYST FOR METHACRYLIC ACID PRODUCTION, PROCESS FOR PRODUCING SAME, AND PROCESS FOR PRODUCING METHACRYLIC ACID

摘要

Disclosed is a catalyst for methacrylic acid production that can produce methacrylic acid with high selectivity.  Also disclosed are a process for producing the catalyst and a process for producing methacrylic acid using the catalyst.  At least a source of molybdenum and a source of element X are added into water to prepare an aqueous slurry or aqueous solution containing a heteropoly acid.  An alkali metal compound is added to the aqueous slurry or aqueous solution to precipitate a heteropoly acid salt in which at least a part of the heteropoly acid is converted to an alkali metal salt.  A source of phosphorus is then added to produce a catalyst comprising elemental phosphorus, elemental molybdenum, element X (at least one element selected from the group consisting of silicon, titanium, germanium, arsenic, antimony, and cerium), and an alkali metal element.  The catalyst is used in the production of methacrylic acid.