Catalyst, preparation method thereof and Fischer-Tropsch method

Abstract

The invention relates to a catalyst and a preparation method thereof. The catalyst comprises an inner core and an outer layer, wherein the inner core is of a first catalyst carrier; the outer layer is wrapped on the inner core; the outer layer comprises a second catalyst carrier and an active metal ingredient loaded on the second catalyst carrier, wherein the first catalyst carrier and the second catalyst carrier are made of the same material. The invention also provides a Fischer-Tropsch method. The catalyst provided in the invention has the closely-combined inner core-outer layer structure, and the inner core does not have the active metal ingredient basically, therefore, the catalyst has high selectivity, thereby being especially applicable for the Fischer-Tropsch reaction for preparing medium alkane and heavy alkane.

Description

technical field

[0001] The invention relates to a catalyst and a preparation method thereof, in particular to a Fischer-Tropsch synthesis catalyst with an inner core-outer layer structure, a preparation method thereof and a Fischer-Tropsch synthesis method. Background technique

[0002] The Fischer-Tropsch synthesis reaction is a gas-solid-liquid multiphase reaction system. In a fixed-bed reactor, the particle diameter of the catalyst is generally several mm. Therefore, the influence of diffusion control on the catalytic activity is unavoidable. The heavy paraffin wax obtained by Fischer-Tropsch synthesis is usually supported on the surface of the catalyst in the form of liquid, aerosol or slurry, and the reactant H 2 and the diffusion of CO inside the catalyst particles. During the internal diffusion of reactants, H 2 The diffusion rate of CO is faster than that of CO, and the diffusion limitation of CO in the catalyst particles is obviously stronger than that of H 2 . ...

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