PLASMA CHEMICAL METHOD OF PRODUCING CHROMIA-ALUMINA CATALYST FOR DEHYDROGENATION OF HYDROCARBONS Russian patent published in 2009 - IPC B01J37/34 B01J21/04 B01J23/26 B82B3/00 

FIELD: chemistry.

SUBSTANCE: proposed plasma chemical method of producing chromia-alumina catalyst for dehydrogenation of hydrocarbons involves thermal processing of initial reagents, taken in form of aluminium and chrome carbonyl powder in a stream of an air low-temperature plasma. The reagents are put into the stream of the air plasma and reactor separately, in form of an aerosol with argon carrier gas in quantity, sufficient for obtaining a catalyst, containing 15-20 wt % chrome oxide and 80-85 wt % aluminium oxide, which is cooled to temperature not above 40°C in form of a pulverised stream, and extracted from the reactor. The catalyst powder undergoes oxidative processing by at least one chemical reagent, chosen from a group comprising nitric acid, ammonium nitrate, ammonium dichromate, taken in form of an aqueous concentrated solution. Excess reagent is evaporated. The processed catalyst is dried and baked in air at temperature not higher than 550°C for not more than two hours. The catalyst is processed by the given reagents at 80-100°C temperature for not more than 2 hours. Processing of the catalyst in nitric acid is carried out in an autoclave at 175°C temperature for 20 minutes.

EFFECT: increased output of the method, output of target product, its dispersiveness, retention of catalytic activity.

3 cl, 1 dwg