Preparation process of supported catalyst for the synthesis of methacrolein and methacrylic acid

Abstract

A process for producing a supported catalyst for the synthesis of methacrolein and methacrylic acid in which a catalytic active substance comprising a composite oxide containing molybdenum and bismuth as essential components is supported on the inside surface and/or the outside surface of an inert carrier, which comprises the steps of drying a mixed solution or an aqueous slurry containing the compounds of the elements constituting the catalytic active substance, subjecting the dried product to a primary calcination at a temperature in a range of 200.degree.-400.degree. C. to form a catalytic active substance precursor, comminuting the obtained catalytic active substance precursor to such an extent that the medium particle size in the volume-based particle size distribution becomes 10 .mu.m or less, supporting the comminution product on an inert carrier, and subjecting it to a secondary calcination at a temperature which is 100.degree. C. or more higher than the primary calcination temperature.

Dependencies are inferred from the claim text.