FIELD: chemical or physical processes.
SUBSTANCE: invention relates to a catalyst for converting a feedstock containing at least ethanol into butadiene at temperature of 300 °C to 400 °C, pressure from 0.15 to 0.5 MPa, volume rate from 0.5 to 5 h-1, methods for production and use thereof. Catalyst contains at least tantalum element and at least one mesoporous oxide matrix based on silicon oxide, where the weight content of Ta ranges from 0.3 % to 10 % of the weight of said silicon-based mesoporous oxide matrix. Said catalyst is obtained using a method, including at least one step of washing a mesoporous oxide matrix based on silicon oxide with an inorganic acid. Said washing is carried out by contacting an inorganic acid selected from nitric acid, sulfuric acid and hydrochloric acid, in the form of an aqueous solution with concentration of 0.05M to 3M, temperature of 15 °C to 80 °C and contact time of 30 minutes to 3 hours. Prior to washing, said oxide-based mesoporous oxide matrix based on silicon oxide containing at least 90 wt % silicon oxide, is an amorphous mesoporous silicon oxide with disordered pores which does not contain micropores, and is characterized by specific surface area of 250 m2/g. Method of producing catalyst includes at least following steps: a) at least one stage of acid washing of silicon-based mesoporous oxide matrix using said method, b) at least one step of thermal treatment of said washed matrix obtained at step a) to obtain a catalyst support, c) at least one step of depositing at least one metal precursor of at least a tantalum element on the surface of said substrate obtained at step b), and d) at least one stage of thermal treatment of solid phase obtained at step c). Or a method of producing the catalyst includes steps a') at least one step of depositing at least one metal precursor of at least a tantalum element on the surface of said silicon-based mesoporous oxide matrix, b') at least one stage of thermal treatment of solid phase obtained at stage a'), c') at least one step of acid washing of solid phase obtained at stage b'), and d') at least one stage of thermal treatment of solid phase obtained at stage c').
EFFECT: technical result is improved catalyst activity and high selectivity thereof.
16 cl, 6 tbl, 8 ex
