CATALYST FOR DEHYDROGENATION OF PARAFFIN AND ISOPARAFFIN C-C HYDROCARBONS AND METHOD FOR ITS PREPARATION Russian patent published in 2022 - IPC B01J23/26 B01J21/04 B01J23/04 B01J37/02 C07C5/333 

FIELD: chemistry.

SUBSTANCE: invention relates to a catalyst, a method for its preparation and the use of a catalyst for the dehydrogenation of paraffin and isoparaffin C₃-C₅ hydrocarbons. The catalyst includes a promoted chromium-containing active component deposited on an alumina carrier. The chromium-containing component is promoted by potassium or sodium oxide. The carrier has a specific surface area according to BET from 60 to 140 m²/g and is a multi-phase alumina or aluminum oxide-hydroxide system, which includes one of the following combinations of phases: γ-Al(OH)₃+γ-AlO(OH)+χ-Al₂O₃, γ-AlO(OH)+χ-Al₂O₃, γ-AlO(OH)+γ-Al₂O₃+χ-Al₂O₃, γ-Al₂O₃+χ-Al₂O₃, the content χ-Al₂O₃ in the media ranges from 40 to 60 wt. %. The method for producing the catalyst includes the following stages: a) aluminum hydroxide with a particle size from 10 to 150 microns is dried at a temperature of 80-140°C to a physically bound water content in the range of 0-4.0%; b) dried aluminum hydroxide is calcined in air at a temperature from 250 to 900°C to obtain an aluminum oxide carrier; c) the resulting carrier is mixed with the precursor of the promoter in dry form; d) the resulting mixture is impregnated with an aqueous solution of the precursor of the active component and dried to a humidity of 4-16%; e) primary particle size classification is carried out, selecting a fraction of more than 630 microns, the selected fraction is crushed and returned to the main catalytic mass; f) the catalyst obtained at stage e) is subjected to thermal activation at a temperature of 550-1000°C and g) the final classification of particles is carried out by size to obtain a catalyst with a particle size from 20 to 160 microns.

EFFECT: obtaining a catalyst characterized by a high range of raw material loads, optimal characteristics of mechanical abrasion resistance while maintaining high activity and selectivity of catalysts, as well as stability of the obtained characteristics, controllability of properties depending on the tasks and operating conditions.

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