Nippon Shokubai Co., Ltd.

Nippon Shokubai Kagaku Kogyo Co., Ltd.

Shin-ichi Uchida

Masatsugu Mikawa

Kozi Deguchi

Masamitsu Sasaki

It provide a catalyst for the production of epoxides by a vapor-phase oxidation of an unsaturated hydrocarbon having a chain length of 4-20 carbon atoms and containing no allylic hydrogen atom, characterized by having a catalytic component containing silver and at least one element selected from the group consisting of alkali metals and thallium deposited onto a carrier obtained by mixing &agr;-alumina having a sodium content in the range of 1-70 mmol (as reduced to Na) per kg of &agr;-alumina with an aluminium compound, a silicon compound, and a sodium compound and calcining the resultant mixture, the carrier having a silicon content (as reduced to SiO ) in the range of 0.3 -11.5 mass % based on the mass of the carrier and a sodium content (as reduced to Na O) in the range of 0.11-2.5 mass % based on the mass of the carrier.

Catalyst for production of epoxides and methods for production thereof and epoxides

A method of reactivating a catalyst having reduced activity as a result of having been used in producing an unsaturated aldehyde as a main product by catalytic vapor-phase oxidation reaction of propylene, isobutylene or tertiary butanol, said catalyst being a catalytic oxide comprising molybdenum, bismuth and iron with a Mo:Fe atomic ratio of 12:at least 0.1. The method comprises heat-treating the used catalyst at a temperature of 300.degree. to 500.degree. C. in the presence of a flowing oxidizing gas containing at least 5% by volume of molecular oxygen and at least 0.1% by volume of steam.

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Himeji, Japan

Shin-ichi Uchida