Preparation method of Fischer-Tropsch synthesis iron-based catalyst

Abstract

The invention discloses a preparation method of a precipitating catalyst precursor and a preparation method of Fischer-Tropsch synthesis iron-based catalyst. The method comprises the steps that 1, a precipitator solution and a metal salt solution containing iron salt perform precipitation reaction in a precipitation container to produce iron-based precipitate coarse slurry; 2, the iron-based precipitate coarse slurry is aged in an ageing container; 3, the aged iron-based precipitate is washed and filtered to remove impurities, and then slurry is prepared; 4, the slurry is mixed with a silicon source, a pH value is regulated, and a Fischer-Tropsch synthesis iron-based catalyst precursor is obtained through filtration and optimal drying, wherein the precipitation reaction and the ageing process are sequentially performed in the precipitation container and the ageing container which are different and are serially connected mutually so as to perform the precipitation reaction and the ageing process. By the adoption of the method, continuous production of the prepared Fischer-Tropsch synthesis iron-based catalyst precursor can be achieved, and the quality and the performance of the catalyst can be also improved.

Description

technical field [0001] The invention relates to a preparation method of a precipitated catalyst precursor and a preparation method of a Fischer-Tropsch synthesis iron-based catalyst. Background technique [0002] Fischer-Tropsch synthesis is the synthesis gas (CO+H 2 ) The reaction process in which liquid fuels and other chemicals are synthesized under the action of a catalyst. Commonly used commercial catalysts include iron-based catalysts. Different methods of preparing precipitated iron-based catalysts will significantly affect the morphology, phase, surface structure and strength of the catalyst, and ultimately affect the reaction performance of the catalyst. Therefore, it is very necessary to develop iron-based catalysts suitable for industrial plants of coal liquefaction technology. [0003] CN201061758Y discloses a pipeline continuous mixing reactor for plasma precipitation reaction, comprising a reaction tube, a refrigerant jacket and an outer shell are arranged ou...

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Problems solved by technology

[0006] However, in the prior art method for preparing precipitated iron-based catalysts, it is usually carried out intermittently in a tank reactor with a stirrer, wherein the precipitation reaction and the aging process are often carried out in the same reaction vessel, which leads to inability to Realize the continuous production of catalyst preparation, and there are concentration gradients, temperature gradients and pH gradients in the flow of materials in the tank reactor, which affect the quality of the final catalyst

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