Mitsubishi Rayon Company, Limited

Masaake Kato

Kazuhiro Ishii

Motomu Oh-Kita

The present invention provides a process for the preparation of a catalyst used in the production of unsaturated carboxylic acids such as methacrylic acid by the gas phase catalytic oxidation of the corresponding unsaturated aldehydes such as methacrolein. Said catalyst is composed of a multi-component composition containing at least phosphorus, molybdenum and antimony. The present invention has attained an improvement in its catalytic performance such as conversion rate, selectivity, single-pass yield, etc. by using antimony trioxide with average particle size of no more than 0.2 micron as a starting material upon preparing said catalyst.

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Otake, Japan

Masaake Kato