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Cobalt-based catalyst and preparation method and application thereof

A cobalt-based catalyst, catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high cost, difficulty in large-scale preparation, and high methane selectivity

Pending Publication Date: 2021-11-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it often brings disadvantages such as high methane selectivity, easy catalyst deactivation, high cost, and difficulty in large-scale preparation.

Method used

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  • Cobalt-based catalyst and preparation method and application thereof
  • Cobalt-based catalyst and preparation method and application thereof
  • Cobalt-based catalyst and preparation method and application thereof

Examples

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preparation example Construction

[0026] According to the preparation method of a kind of cobalt-based catalyst provided by the present invention, comprises the steps:

[0027] (1) Provide nano-cobalt particles;

[0028] (2) mixing the nano-cobalt particles described in step (1) with a heat-resistant inorganic oxide precursor, a pore-forming agent, and a blasting agent in a solvent to form a slurry;

[0029] (3) The slurry obtained in step (2) is spray-dried and formed, and then roasted or not roasted;

[0030] Optionally, the operation of introducing auxiliary agents is also included in step (2) and / or after step (3);

[0031] Wherein, the nano-cobalt particles are cobalt oxide and / or cobalt hydroxide nanoparticles.

[0032] According to the present invention, the average size of the cobalt oxide and / or cobalt hydroxide nanoparticles is preferably 5-10 nm, and the nanoparticles can be prepared by any prior art, or can be commercial reagents. For example, it can be prepared by a hydrothermal or solvothermal...

Embodiment 1

[0060] (1) Preparation of Cobalt Oxide Nanoparticles

[0061] Dissolve 28.98kg of cobalt nitrate hexahydrate and 54.37kg of cetyltrimethylammonium bromide (CTAB) in 300 liters of 90% ethanol aqueous solution and stir for 30 minutes; The stainless steel reaction kettle was reacted at 160° C. for 8 hours. After the reaction, the solid nanoparticles were washed three times with 300 liters of 90% ethanol aqueous solution. The obtained nanoparticles were shown in the transmission electron microscope. figure 1 .

[0062] (2) Pulping: disperse 16.00kg pseudo-boehmite SB powder into 100L deionized water, add 0.24kg concentrated nitric acid, stir vigorously until peptized, then add the above-mentioned cobalt oxide nanoparticles, 10.0kg PEG4000 and 6.0kg Ammonium nitrate continued beating for 4h.

[0063] (3) spray drying molding

[0064] The above slurry was molded by a Niro Bowen Nozzle Tower spray drying device, the spray drying pressure was 6.5 to 8.0 MPa, the initial drying air ...

Embodiment 2

[0075] (1) Preparation of Cobalt Oxide Nanoparticles

[0076] Dissolve 21.74kg of cobalt nitrate hexahydrate and 30.11kg of tetradecyltrimethylammonium bromide (TTAB) in 300L of 90% ethanol aqueous solution and stir for 30min; by adding concentrated ammonia water until the pH of the solution is 9, transfer it to 500L of stainless steel The reaction kettle was reacted at 150° C. for 12 hours. After the reaction, the solid nanoparticles were washed three times with 300 L of 90% ethanol aqueous solution; the average particle size of the nano cobalt oxide was 6.2 nm.

[0077] (2) pulping

[0078] Disperse 18.67kg of pseudo-boehmite SB powder into 80L of deionized water, add 0.336kg of concentrated nitric acid, stir vigorously until peptized, then add the above-mentioned cobalt oxide nanoparticles, 6.0kg of PEG4000 and 3.0kg of ammonium nitrate and continue beating for 6h.

[0079] (3) spray drying molding

[0080] The above slurry is molded by a Niro Bowen Nozzle Tower spray dry...

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Abstract

The invention discloses a cobalt-based catalyst, a preparation method and application. The catalyst contains an active component cobalt and a heat-resistant inorganic oxide. By taking the weight of the catalyst as a reference, the content of cobalt in terms of Co3O4 is 30-70 wt%, and the content of the heat-resistant inorganic oxide is 30-70 wt%. The morphology of the catalyst is a hollow microsphere with a macropore on the surface and a cavity structure inside, and the active component cobalt is dispersed in the microsphere in the form of nanoparticles. The preparation method comprises the following steps of: (1) providing nano cobalt particles; (2) mixing the nano cobalt particles obtained in the step (1) with a heat-resistant inorganic oxide precursor, a pore forming agent and a blasting agent in a solvent to form slurry; and (3) spray-drying and molding the slurry obtained in the step (2), and then roasting or not roasting to obtain the catalyst. When the cobalt-based catalyst is applied to Fischer-Tropsch synthesis, the activity and selectivity of the catalyst are obviously superior to those of a catalyst in the prior art.

Description

technical field [0001] The invention belongs to the field of catalytic conversion, and in particular relates to a Fischer-Tropsch synthesis catalyst and its preparation method and application. Background technique [0002] As global oil resources become more and more scarce, people pay more and more attention to environmental protection, and people pay more and more attention to the preparation of clean fuels and chemicals by using coal and natural gas as raw materials. Fischer-Tropsch synthesis technology is one of the key technologies for the clean utilization of coal and natural gas. [0003] The main products of the Fischer-Tropsch synthesis reaction in which synthesis gas is converted into hydrocarbons on catalysts include alkanes and olefins, which can be further processed to obtain high-quality liquid fuels and chemicals. Fischer-Tropsch synthesis products have a wide distribution, which generally conforms to the ASF distribution. Therefore, controlling the selectivi...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J35/08B01J37/08C10G2/00
CPCB01J23/75B01J23/002B01J37/0018C10G2/33B01J35/393B01J35/23B01J35/51
Inventor 张思夏吴玉侯朝鹏夏国富李明丰
Owner CHINA PETROLEUM & CHEM CORP
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