CATALYST FOR USE IN PRODUCTION OF METHACRYLIC ACID, METHOD FOR PRODUCING SAID CATALYST, AND METHOD FOR PRODUCING METHACRYLIC ACID USING SAID CATALYST

摘要

The purpose of the present invention is to provide a method for producing a catalyst for use in the production of methacrylic acid through the vapor-phase catalytic oxidation of methacrolein, isobutylaldehyde or isobutyric acid with high yield and high selectivity. A catalyst produced by adding an alkali metal element, particularly cesium among alkali metal elements, to a partially neutralized salt of a heteropoly acid by a specific method, wherein the partially neutralized salt contains Mo, V, P, an alkali metal element and NH4 as essential active components. The catalyst is characterized by having extremely high catalytic performance.