Mitsubishi Petrochemical Company Limited

Yoichi Ishii

Takeshi Shibano

Kohei Sarumaru

Etsuji Yamamoto

Isamu Kobayashi

Kohei Sarumar

A process for producing a composite oxide catalyst comprising at least Sb, Mo, V and/or Nb by the steps of combining and heating the sources of required respective elements, characterized in that a composite oxide represented by the following formula, which has been heated previously at a temperature of 600.degree. to 900.degree. C., is used as at least a part of a source of Sb supply:

Process for producing composite oxide catalyst

A process for regenerating a Mo.Bi-based multi-oxide catalyst the catalytic performance of which has deteriorated as a result of its use in vapor-phase catalytic oxidation of propylene or isobutene to prepare acrolein or methacrolein, respectively, which process comprises: heating the deteriorated Mo.Bi-based multi-oxide catalyst in an atmosphere consisting essentially of air at a temperature of 380.degree. C. to 540.degree. C., so as to attain at least partial restoration of the catalytic performance thereof.

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Ami, Japan

Yoichi Ishii