Multistage duct type cobalt-based Fischer-Tropsch synthesis catalyst with core-shell structure and preparation method of multistage duct type cobalt-based Fischer-Tropsch synthesis catalyst

Abstract

The invention discloses a multistage duct type cobalt-based Fischer-Tropsch synthesis catalyst with a core-shell structure and a preparation method of the multistage duct type cobalt-based Fischer-Tropsch synthesis catalyst. The catalyst comprises a catalyst carrier S, a metal active component Co loaded on the catalyst carrier S and a shell layer zeolite membrane M which wraps the surface of the catalyst carrier S, wherein the catalyst carrier S is a mixture of one or two of SiO2 and Al2O3 according to an optional ratio, the microstructure form of SiO2 and Al2O3 is spherical, the specific surface area of the microstructure form is 160-290 m(2) / g, and the average particle size ranges from 10 meshes to 50 meshes; the shell layer zeolite membrane M is a cluster aggregation of H-ZSM-5 nano particles which are dispersed uniformly, the particle size range of the H-ZSM-5 nano particles is between 10 nm and 30 nm, the micropore aperture of the H-ZSM-5 is smaller than or equal to 2.0 nm, and gaps among the adjacent H-ZSM-5 nano particles are smaller than or equal to 100 nm; and the loading capacity of the metal active component Co accounts for 10-30% of the sum of the weight of the catalyst carrier S and the weight of the metal active component Co. The shell layer of the Fischer-Tropsch synthesis catalyst has a multistage duct and high catalyzing efficiency. Meanwhile, the preparation method is simple in technology and low in energy consumption.

Description

technical field [0001] The invention belongs to the technical field of Fischer-Tropsch synthesis, and specifically refers to a core-shell structure multi-stage channel type cobalt-based Fischer-Tropsch synthesis catalyst and a preparation method thereof. Background technique [0002] The Fischer-Tropsch synthesis reaction refers to the synthesis of coal, natural gas, biomass and other resources through synthesis gas (CO and H 2 ) Catalyzed conversion into hydrocarbons. The products of Fischer-Tropsch synthesis are sulfur-free, nitrogen-free and aromatic-free, so the liquid fuels generated by Fischer-Tropsch synthesis can meet the increasingly stringent environmental protection requirements. key raw material. Therefore, the Fischer-Tropsch synthesis reaction is one of the important ways for the indirect conversion of non-oil-based resources to high-quality liquid fuels and chemical raw materials. Low-carbon olefins are important organic chemical raw materials, and their pr...

AI Technical Summary

Problems solved by technology

However, the limitation of the micropores of the molecular sieve membrane in this method leads to an extremely low CO conversion rate of only about 40%.

Moreover, neither of the above two methods can solve the problem that the molecular sieve pore size distribution is too concentrated in the micropores, resulting in a decrease in conversion rate.

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