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A preparation method of a particle-controllable and monodisperse cobalt-based Fischer-Tropsch synthesis catalyst

A cobalt-based Fischer-Tropsch synthesis technology, which is applied in the field of preparation of Fischer-Tropsch synthesis catalysts, can solve the problems of difficult sintering, poor dispersibility, and difficult control of cobalt crystal grains, and achieves hard carbon deposition, good stability, and hard deactivation. Effect

Active Publication Date: 2017-09-15
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the deficiencies in the prior art, the object of the present invention is to overcome the shortcomings of conventional cobalt-based catalysts, such as difficult control of cobalt crystal grains and poor dispersion, and provide a cobalt-based catalyst with controllable cobalt particles and monodispersity. Applied in the Fischer-Tropsch synthesis reaction, it has the characteristics of high reactivity, good stability, high selectivity of heavy hydrocarbons, low selectivity of methane and not easy to sinter.

Method used

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  • A preparation method of a particle-controllable and monodisperse cobalt-based Fischer-Tropsch synthesis catalyst
  • A preparation method of a particle-controllable and monodisperse cobalt-based Fischer-Tropsch synthesis catalyst
  • A preparation method of a particle-controllable and monodisperse cobalt-based Fischer-Tropsch synthesis catalyst

Examples

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Effect test

Embodiment 1

[0045] A kind of preparation method of 15Co / MCF-1 catalyst, its steps are as follows:

[0046] Get 2.0g silica mesoporous foam (specific surface area 654.6m 2 / g, small pore diameter 9.2nm, large pore diameter 45.1nm) baked in an oven at 100°C for 24h;

[0047] Mix 0.13g of absolute ethanol with 3.6g of distilled water, then add 0.04g of citric acid to obtain a mixed solution, then weigh 1.74g of cobalt nitrate and dissolve it in the above mixed solution to obtain a mixed solution containing cobalt sources;

[0048] Then, while rotating on the rotary evaporator, use a constant flow pump to evenly and slowly drop the mixed solution containing the cobalt source into the silicon oxide mesoporous foam. The rotating speed of the rotary evaporator is 80r / min. The mixed solution of the cobalt source was added dropwise in 70 minutes, therefore, the flow rate of the constant flow pump was 1.0ml / min. During the dripping process, when the carrier forms a large mass, stop the rotation a...

Embodiment 2

[0053] A kind of preparation method of 15Co / MCF-2 catalyst, its steps are as follows:

[0054] Get 2.0g silica mesoporous foam (specific surface area 654.6m 2 / g, small pore diameter 9.2nm, large pore diameter 45.1nm) baked in an oven at 100°C for 24h;

[0055] Mix 0.13g of absolute ethanol with 3.6g of distilled water, then add 0.8g of citric acid to obtain a mixed solution, then weigh 1.74g of cobalt nitrate and dissolve it in the above mixed solution to obtain a mixed solution containing cobalt sources;

[0056] Then, while rotating on the rotary evaporator, use a constant flow pump to evenly and slowly drop the mixed solution containing the cobalt source into the silicon oxide mesoporous foam. The rotating speed of the rotary evaporator is 80r / min. The mixed solution of the cobalt source was added dropwise in 70 minutes, therefore, the flow rate of the constant flow pump was 1.0ml / min. During the dripping process, when the carrier forms a large mass, stop the rotation an...

Embodiment 3

[0061] A kind of preparation method of 15Co / MCF-3 catalyst, its step is as follows:

[0062] Get 2.0g silica mesoporous foam (specific surface area 654.6m 2 / g, small pore diameter 9.2nm, large pore diameter 45.1nm) baked in an oven at 100°C for 24h;

[0063] Mix 0.13 g of absolute ethanol with 3.6 g of distilled water, then add 0.4 g of citric acid to obtain a mixed solution, then weigh 1.74 g of cobalt nitrate and dissolve in the above mixed solution to obtain a mixed solution containing cobalt sources;

[0064] Then, while rotating on the rotary evaporator, use a constant flow pump to evenly and slowly drop the mixed solution containing the cobalt source into the silicon oxide mesoporous foam. The rotating speed of the rotary evaporator is 80r / min. The mixed solution of the cobalt source was added dropwise in 70 minutes, therefore, the flow rate of the constant flow pump was 1.0ml / min. During the dripping process, when the carrier forms a large mass, stop the rotation and...

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Abstract

The invention belongs to the technical field of preparation methods of Fischer-Tropsch synthesis catalysts, and specifically discloses a preparation method of a cobalt-based Fischer-Tropsch synthesis catalyst with controllable mono-dispersed particles. The method is characterized in that an anhydrous ethanol, distilled water and carboxyl-containing organic matter mixed solvent combined according to a controlled ratio are used as a solvent to dissolve an active component with a meso-porous material with a special morphology as a carrier, the solvent is added to the meso-porous in a dropwise controlled manner, and the obtained material is dried and roasted to obtain the catalyst. The cobalt particles of the catalyst prepared in the invention have the characteristics of controllable size, mono-dispersion, and high dispersion because of the interaction of anhydrous ethanol, distilled water, the organic matter and a cobalt source, wherein the anhydrous ethanol, distilled water and the organic matter are indispensable. The catalyst prepared in the invention has the characteristics of high reaction activity, good stability, high selectivity of heavy hydrocarbons, low methane selectivity, difficult sintering and the like in the Fischer-Tropsch reaction, and the preparation method is obviously better than routine preparation methods.

Description

technical field [0001] The invention relates to the technical field of preparation of Fischer-Tropsch synthesis catalysts, in particular to a preparation method of a cobalt-based Fischer-Tropsch synthesis catalyst with controllable particles and monodisperse. Background technique [0002] Fischer-Tropsch synthesis is the synthesis gas (H 2 / CO) is converted into hydrocarbons and oxygenates by a catalyst. Efficient (high activity, high product selectivity, high stability) cobalt-based Fischer-Tropsch synthesis catalyst is one of the key factors in Fischer-Tropsch synthesis technology. [0003] At present, cobalt-based catalysts are ideal Fischer-Tropsch synthesis catalysts that have been successfully applied in industry. The activity of cobalt-based catalysts is proportional to the area of ​​exposed active metal cobalt, that is, the more active sites are exposed, the higher the activity. This requires metal cobalt to be well dispersed in the carrier. The smaller the cobal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J29/03C10G2/00
Inventor 李金林韦良张煜华赵燕熹刘成超
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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