Mitsubishi Rayon Company, Limited

Nitto Chemical Industry Co., Ltd.

Dia-nitrix Co., Ltd.

Koichi Mizutani

Yutaka Sasaki

Kunio Mori

Hiroshi Yamamoto

Yoshimi Nakamura

Kiyoshi Moriya

Motoo Yanagita

Jinko Izumi

Seigo Watanabe

A catalyst for acrylonitrile synthesis is disclosed which is composed of particles containing silica and a composite oxide including at least molybdenum. When the Mo/Si atomic ratio in bulk composition of the catalyst is represented by A and the Mo/Si atomic ratio in surface composition of the particles is represented by B, B/A is not more than 0.6.

Catalyst for acrylonitrile synthesis

There is provided a process for producing a particulate iron-antimony containing oxide composition having high compressive strength, comprising the steps of: providing an aqueous slurry containing iron ions, nitrate ions and antimony trioxide; adjusting the slurry to a pH value in the range of 0.5 to 3 as measured at 40.degree. C.; heating the slurry; spray-drying the heated slurry; and calcining the resultant particles.

Process for producing particulate iron-antimony containing oxide

An iron-antimony-molybdenum-containing oxide catalyst composition for oxidation reactions, comprising a crystalline iron antimonate having a crystallite size of 100 .ANG. or more, said catalyst being represented by the following empirical formula:

Iron-antimony-molybdenum-containing oxide catalyst composition and

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Yokohama, Japan

Koichi Mizutani