Precipitation iron-based Fischer-Tropsch synthesis catalyst and preparation method thereof

Abstract

The invention relates to the field of Fischer-Tropsch synthesis reaction, and discloses a precipitation iron-based Fischer-Tropsch synthesis catalyst and a preparation method thereof. The precipitation iron-based Fischer-Tropsch synthesis catalyst is prepared from Fe, Cu, K, Na and SiO2 according to a weight ratio of 100:(0.1 to 6):(0.6 to 6):(0 to 1):(5 to 24), wherein the Fe mainly exists in thetwo-line hydrated iron oxide phase and is mixed with material phases of alpha-Fe2O3 and gamma-Fe2O3; the Cu, K and Na respectively exist in an oxide form; chemical bond combination Fe-O-Si bridging feature peaks exist between infrared adsorption spectrums 960 to 980 cm<-1>. The precipitation iron-based Fischer-Tropsch synthesis catalyst provided by the invention has higher anti-chemical-abrasionintensity and anti-physical-abrasion intensity. When the catalyst is used for slurry state bed Fischer-Tropsch synthesis reaction, the service life is longer; the selectivity on the long-chain hydrocarbon heavy-weight products (such as C5+ products) is obviously and greatly enhanced; the methane selectivity and the C2 to C4 lighter hydrocarbon product selectivity can be reduced.

Description

technical field [0001] The present invention relates to the field of Fischer-Tropsch synthesis reaction, in particular to a precipitated iron-based Fischer-Tropsch synthesis catalyst, a method for preparing the precipitated iron-based Fischer-Tropsch synthesis catalyst, a precipitated iron-based Fischer-Tropsch synthesis catalyst prepared by the method, and the use of The invention relates to a slurry bed Fischer-Tropsch synthesis method of the precipitated iron-based Fischer-Tropsch synthesis catalyst. Background technique [0002] In the application and development process of Fischer-Tropsch (F-T) synthetic precipitated iron-based catalysts, so far, among the numerous catalyst formulations and preparation methods, the composition and preparation process from Ruhrchemie A.G., Germany, namely 100Fe / 5Cu / 4.2K / 25SiO2 2 Formulation (Frohning, C.D.; H. Ralek, M.; Rottig, W.; Schuur, F.; Schulz, H., Fischer-Tropsch-Synthese, in J. Falbe, ed., Chemierohstoffe aus Kohle, Georg T...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the low wear resistance of existing precipitated iron-based Fischer-Tropsch synthesis catalysts and the low selectivity of long-chain hydrocarbon products when used in slurry bed Fischer-Tropsch synthesis reactions, and to provide a Precipitated iron-based Fischer-Tropsch synthesis catalyst, preparation method thereof, and slurry bed Fischer-Tropsch synthesis method

Therefore, in order to solve the problem that the precipitated iron-based catalyst is easy to wear or break during the slurry bed synthetic oil reaction process, it is necessary to start with the improvement of the internal phase structure of the catalyst, so that it can be used in the fresh catalyst sample to the pre-reduction activation process. , and in the subsequent Fischer-Tropsch synthesis reaction process can have a stronger phase structure and inner pore characteristics, it is possible to fundamentally solve the above-mentioned wear problem, and can meet the requirements of long-term, high-load slurry bed Fischer-Tropsch Synthetic Oil Process Requirements

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