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

Abstract

The invention relates to the field of Fischer-Tropsch synthesis iron-based catalysts, and discloses a Fischer-Tropsch synthesis iron-based catalyst, a preparation method thereof, and a Fischer-Tropschsynthesis method. The preparation method comprises: (1) etching a first mixture of an iron-containing oxide and an acid solution at 20-120 DEG C for at least 2 h to obtain a dispersed slurry; (2) mixing the dispersion slurry, an M salt, a copper salt, a potassium salt, a silicon-containing compound and optionally water to obtain a second mixture; (3) adjusting the pH value of the second mixture to 4-9 to obtain a third mixture; and (4) carrying out spray drying treatment and roasting treatment on the third mixture. The preparation method provided by the invention has the advantages that the preparation process flow is simple; no catalyst needs to be washed, and water consumption is low; compared with a melting method, the preparation process is mild in condition and low in energy consumption; and the prepared catalyst has high reaction activity, high and low carbon olefin selectivity and high added value of the product.

Description

technical field [0001] The invention relates to the field of Fischer-Tropsch synthesis iron-based catalysts, in particular to a Fischer-Tropsch synthesis iron-based catalyst, a preparation method thereof and a Fischer-Tropsch synthesis method. Background technique [0002] First discovered by German chemists Fischer and Tropsch in the 1920s, Fischer-Tropsch synthesis is an important way to convert coal and natural gas into liquid fuels or high value-added chemical products. In the 1950s, South African Sasol Company realized the industrial production of Fischer-Tropsch synthesis, and the catalyst used was Fischer-Tropsch iron-based catalyst. [0003] The reactors used in Fischer-Tropsch synthesis mainly include fixed bed reactors, fluidized bed reactors and slurry bed reactors. The preparation methods of iron-based catalysts for Fischer-Tropsch synthesis are mainly divided into three types: precipitation method, melting method and impregnation method. Precipitation method t...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a Fischer-Tropsch synthesis iron-based catalyst in order to overcome the cumbersome preparation process of the Fischer-Tropsch synthesis iron-based catalyst in the prior art, harsh preparation conditions, and low catalyst activity and selectivity. Preparation method, Fischer-Tropsch synthesis iron-based catalyst prepared by the method and a Fischer-Tropsch synthesis method

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