Micro spherical Fischer-Tropsch synthesis catalyst and preparation method thereof

Abstract

The invention relates to a heavy hydrocarbon Fischer-Tropsch synthesis catalyst and a preparation method thereof. Since a Fischer-Tropsch synthesis reaction is a strong exothermic reaction, when a fixed bed is used, reaction heat is difficult to remove, temperature runaway is easily caused and a catalyst is easily inactivated and when a fluidized bed is used, selectivity of heavy hydrocarbon (hydrocarbons containing more than five carbon atoms) is low. By adoption fo the heavy hydrocarbon Fischer-Tropsch synthesis catalyst and the preparation method thereof, provided by the invention, all the problems in the prior art can be solved. According to the technical scheme, an iron-based fluidized bed catalyst is adopted, wherein at least one of Si and Al oxides is taken as a carrier of the catalyst and the active component of the catalyst contains a composition with the following chemical formula in atomic ratio: Fe100AaMnbCrcOx; and synthetic gas serving as raw material comes into contact with the iron-based fluidized bed catalyst in a fluidized bed to react under the conditions that the reaction pressure is 0.5-10MPa, the reaction temperature is 200-600 DEG C, reaction air speed is 100-8000 / h and ratio of H2 / CO in the raw material gas is (0.1-5.0):1, so as to generate heavy hydrocarbon. The heavy hydrocarbon Fischer-Tropsch synthesis catalyst can be applied to industrial production of fluidized bed Fischer-Tropsch synthesis reaction.

Description

technical field [0001] The invention relates to a catalyst for Fischer-Tropsch synthesis of heavy hydrocarbons and a preparation method thereof. Background technique [0002] The method of converting synthesis gas into liquid hydrocarbons through catalyst action was invented by German scientists Frans Fischer and Hans Tropsch in 1923, referred to as F-T synthesis, that is, CO undergoes a heterogeneous catalytic hydrogenation reaction on a metal catalyst to produce linear alkanes and Olefin-based mixture process. Germany carried out research and development in the 1920s and realized industrialization in 1936. After World War II, it was closed because it could not compete economically with the oil industry; South Africa has abundant coal resources, but lacks oil resources and has long-term Restricted by international social economic and political sanctions, it was forced to develop coal-to-oil industrial technology, and built the first coal-based F-T synthetic oil plant (Saso...

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by this invention is that in the prior art, the Fischer-Tropsch synthesis reaction is a strong exothermic reaction. When using a fixed bed, the reaction is difficult to remove heat, and it is easy to overheat, which makes the catalyst easily deactivated; bed, the problem of low selectivity of heavy hydrocarbons, providing a new iron-based catalyst for Fischer-Tropsch synthesis of heavy hydrocarbons

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