Iron carbide catalyst coated by high-iron-content graphite layer as well as synthetic method and application thereof

Abstract

The invention belongs to the technical field of designed synthesis of Fischer-Tropsch synthesis catalysts and specifically discloses a graphite layer coated iron carbide catalyst as well as a preparation method and application thereof in Fischer-Tropsch synthesis. The catalyst prepared in the invention comprises Fe3C particles with uniform size and is uniformly inlaid in a graphite carbon layer, the surface of the catalyst is enriched in oxygen / nitrogen-containing functional groups, and the specific surface area of the catalyst is 80-350m<2> / g. Under the high-iron-content condition, the CO conversion frequency FTY value of the catalyst under unit iron content reaches 1130umol COgFe<-1>s<-1>, and the catalyst has ultrahigh catalytic activity; and meanwhile, an electron promoter can be conveniently doped in the preparation process for regulating the selectivity of the Fischer-Tropsch synthesis product, and a specific Fischer-Tropsch synthesis product can be obtained.

Description

technical field [0001] The invention belongs to the technical field of design and synthesis of Fischer-Tropsch synthesis catalysts, and specifically discloses a novel iron-based Fischer-Tropsch synthesis catalyst with high iron content, a synthesis method and application thereof. Background technique [0002] Fischer-Tropsch synthesis is the synthesis gas (H 2 +CO) is an important technology for catalytic conversion into hydrocarbon products under certain conditions, and is a key technology for replacing fossil energy in the production of fuel oil in the future. Iron catalysts have become one of the most important catalysts in industry due to their low methane selectivity, good toxicity resistance and low price. In industry, precipitated iron or molten iron catalysts are generally used for medium or high temperature Fischer-Tropsch reactions. However, traditional precipitated iron and molten iron catalysts are prone to carbon deposition and sintering, which leads to loss o...

AI Technical Summary

Problems solved by technology

However, traditional precipitated iron and molten iron catalysts are prone to carbon deposition and sintering, which leads to loss of activity specific surface and reduction of mechanical strength, resulting in greatly reduced catalyst life

The high-performance supported iron-based Fischer-Tropsch synthesis catalyst is still under development. Although the supported catalyst can use the carrier to improve the mechanical strength of the catalyst, on the one hand, the carrier with strong interaction, because the strong interaction between the iron particles and the carrier The effect will greatly reduce the catalyst activity, on the other hand, the carrier with low interaction will cause the iron particles to agglomerate and deactivate

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