Cobalt-based fischer-tropsch synthesis catalyst and preparation method and application

Abstract

The invention discloses a cobalt-based fischer-tropsch synthesis catalyst and a preparation method and application. The catalyst disclosed by the invention is prepared from 2wt%-10wt% of an active component Co and 90%-98% of a carrier Al2O3-SiO2 composite aerogel on the basis of the total weight of the catalyst, wherein the specific surface area of the catalyst is 250-750m<2> / g; the mean pore size is 9-28.6nm; and the pore volume is 2.75-4.23mL / s. The preparation method comprises the following steps: (1) preparing Al2O3 sol; (2) preparing SiO2 gel; and (3) preparing Co / Al2O3-SiO2 composite aerogel. The catalyst disclosed by the invention is high in specific surface area and large in aperture due to a three-dimensional pore system; the active components are evenly dispersed into pores; the agglomeration of metal particles is prevented; and the diffusion of a reactant and a product is facilitated, so that the cobalt-based fischer-tropsch synthesis catalyst can be relatively well applied to fischer-tropsch synthesis and the diesel selectivity is high.

Description

technical field [0001] The invention belongs to the field of industrial catalytic Fischer-Tropsch synthesis (F-T synthesis), and specifically refers to a cobalt-based Fischer-Tropsch synthesis catalyst for synthesizing diesel with high selectivity, a preparation method and application. Background technique [0002] Fischer-Tropsch synthesis is a chemical process that converts synthesis gas into higher hydrocarbons, and is one of the most important ways to efficiently convert and utilize non-petroleum carbon resources (natural gas, coal, residual oil, and biomass, etc.). Syngas generates a series of higher hydrocarbons with different carbon numbers under the action of catalysts (C 1 ~C 200 ), mainly straight-chain alkanes, and some low-carbon olefins and alcohols are obtained at the same time. The initial product is further processed (such as separation, hydrocracking or hydroisomerization, etc.) to obtain certain specifications of gasoline, diesel and other oil fuels, as w...

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Problems solved by technology

[0007] Wang Qigang et al. (Industrial Catalysis, 2013, 21(5), 1-6) summarized various achievements of oxide aerogels used in Fischer-Tropsch synthesis reported abroad, but the aerogels reported in these documents are all based on a single The aerogel is a cobalt-based or iron-based catalyst supported by the carrier, the prepared aerogel has a large pore size, and the resulting product has a high olefin content

[0008] At present, there are many domestic research institutes on aerogels, but most of them are studying single aerogels, and a few are researching composite aerogels. These aerogels are used for photocatalysis or other materials. I have seen reports on the use of airgel for Fischer-Tropsch synthesis, but there are not many foreign reports. Even if there are, a single airgel is used as the carrier, and the selectivity of diesel in the product is not high.

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