FIELD: chemistry.
SUBSTANCE: invention relates to a catalyst and method for direct conversion of synthesis gas to obtain olefins in which the number of carbon atoms is less than or equal to 4. Said catalyst is a mixed catalyst A + B, where catalyst component A and catalyst component B are combined by mechanical stirring; active component of component A of catalyst is an active metal oxide; catalyst B is a loadable molecular sieve, wherein the support is one, two or more of Al2O3, SiO2, TiO2, ZrO2, CeO2, MgO and Ga2O3 with multilevel pore system; molecular sieve has one or two of structures CHA and AEI; loading of molecular sieve ranges from 4 to 45 wt. %; active metal oxide is one, two or more of MnO, MnCr2O4, MnAl2O4, MnZrO4, ZnO, ZnCr2O4, ZnAl2O4, CoAl2O4 and FeAl2O4 and has on surface of concentration of oxygen vacancies of 20–90 %, where surface oxygen vacancies are defined as 100 % molar fraction in percentage of oxygen atoms relative to theoretical stoichiometric molar amount of oxygen, wherein molar amount of oxygen atoms is 80–10 % of theoretical stoichiometric amount in form of molar oxygen content. Conversion reaction is carried out in conditions of a fixed bed or a movable layer in the presence of said catalyst using synthetic gas as a reaction material. Synthetic gas pressure is 0.5–10 MPa, reaction temperature is 300–600 °C, volume rate is 300–10,000 h-1, and the ratio of H2/CO in the synthesis gas used in said reaction is 0.2–3.5.
EFFECT: reaction process is characterized by high selectivity with respect to low-carbon olefins, wherein selectivity with respect to ethylene, propylene and butylene in total can reach 50–90 %, while selectivity with respect to methane, which is a by-product, is lower than 15 %, which generally indicates good prospects for use.
7 cl, 5 tbl
