PROCESS FOR THE PREPARATION OF SUPPORTED CATALYST FOR SYNTHESIS OF METHACROLEIN AND METHACRYLIC ACID

摘要

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 200-400 DEG 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 DEG C or more higher than the primary calcination temperature.