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

A Fischer-Tropsch synthesis and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, preparation of liquid hydrocarbon mixtures, etc., can solve problems such as high olefin content in products, low diesel selectivity, and large airgel pore size , to achieve high diesel selectivity, improved impregnation, and large pore size

Active Publication Date: 2015-05-20
WUHAN KAIDI ENG TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0030] Catalyst A consists of active component Co, carrier Al 2 o3 -SiO 2 Composite airgel composition. Co content is 2%, Al 2 o 3 -SiO 2 The content is 98%. The preparation method of catalyst A is as follows:

[0031] 1) Weigh 1.7g of deionized water and add it to 32.03g of aluminum isopropoxide, transfer it to 28.89g of ethanol after mixing, stir at a constant temperature of 45°C for 60 minutes, let it stand to cool to room temperature, and obtain Al 2 o 3 sol, and store it in the refrigerator.

[0032] 2) Weigh 25.38g of methyl orthosilicate, 30.73g of ethanol and 12.02g of deionized water and mix evenly, then add ammonia water to adjust the pH value of the solution to 8, stir for 20 minutes, and let stand until the gel is formed to obtain SiO 2 Sol.

[0033] 3) Weigh 1.18gSiO2 2 Sol was added to 8.02gAl 2 o 3 In the sol, after mixing and stirring evenly, add the mixed solution of 2.76g glacial acetic acid, methanol and water, wherein the volume ratio of glacial...

Embodiment 2

[0038] Catalyst B consists of active component Co, carrier Al 2 o 3 -SiO 2 Composite airgel composition. Co content is 5%, Al 2 o 3 -SiO 2 The content is 95%. The preparation method of catalyst B is as follows:

[0039] 1) Weigh 1.7g of deionized water and add it to 38.62g of aluminum sec-butoxide, transfer it to 72.22g of ethanol after mixing, stir at a constant temperature of 55°C for 55 minutes, let it stand to cool to room temperature, and obtain Al 2 o 3 sol, and store it in the refrigerator.

[0040] 2) Weigh 34.74g tetraethyl orthosilicate, 46.09g ethanol and 15.03g deionized water and mix evenly, then add ammonia water to adjust the pH value of the solution to 9, stir for 25 minutes, let it stand until the gel is formed, and obtain SiO 2 Sol.

[0041] 3) Weigh 4.71gSiO2 2 Sol was added to 7.44gAl 2 o 3 In the sol, after mixing and stirring evenly, add a mixed solution of 1.82g glacial acetic acid, methanol and water, wherein the volume ratio of glacial ace...

Embodiment 3

[0046] Catalyst C consists of active component Co, carrier Al 2 o 3 -SiO 2 Composite airgel composition. Co content is 10%, Al 2 o 3 -SiO 2 The content is 90%. The preparation method of catalyst C is as follows:

[0047] 1) Weigh 1.7g of deionized water and add it to 58.88g of aluminum nitrate nonahydrate, transfer it to 115.56g of ethanol after mixing, stir at a constant temperature of 65°C for 40 minutes, let it stand to cool to room temperature, and obtain Al 2 o 3 sol, and store it in the refrigerator.

[0048] 2) Weigh 34.74g of tetraethyl orthosilicate, 61.46g of ethanol and 18.036g of deionized water and mix evenly, then add ammonia water to adjust the pH value of the solution to 8, stir for 30 minutes, and let stand until the gel is formed to obtain SiO 2 Sol.

[0049] 3) Weigh 9.42gSiO2 2 Sol was added to 8.09gAl 2 o 3 In the sol, after mixing and stirring evenly, add a mixed solution of 0.18g glacial acetic acid, methanol and water, wherein the volume ra...

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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...

Claims

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Application Information

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IPC IPC(8): B01J23/75C10G2/00
CPCB01J21/12B01J23/75B01J37/00C10G2/00B01J35/60
Inventor 饶莎莎宋德臣刘倩倩海国良汪大闪李昌元詹晓东
Owner WUHAN KAIDI ENG TECH RES INST CO LTD
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