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Co@NCNT material prepared by reduction-oxidation-reduction strategy and preparation method of Co@NCNT material

A Strategic, Oxidative Technology for Porous Materials

Active Publication Date: 2021-05-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the existing methods, the purpose of the present invention is to provide a Co@NCNT material prepared by a reduction-oxidation-reduction strategy and a preparation method thereof

Method used

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  • Co@NCNT material prepared by reduction-oxidation-reduction strategy and preparation method of Co@NCNT material
  • Co@NCNT material prepared by reduction-oxidation-reduction strategy and preparation method of Co@NCNT material
  • Co@NCNT material prepared by reduction-oxidation-reduction strategy and preparation method of Co@NCNT material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This example provides a method for preparing a Co@NCNT material prepared by a reduction-oxidation-reduction strategy, including the following steps:

[0038] (1) Dimethylimidazole (12mmol) was added into anhydrous methanol (75mL), dissolved by ultrasonication for 3min to obtain an organic ligand solution; Co(NO 3 ) 2 ·6H 2 O (3mmol) was dissolved in anhydrous methanol (75mL) to obtain a Co salt solution;

[0039] (2) Add the Co salt solution in step (1) to the organic ligand solution, stir at room temperature for 15 minutes, and after standing for 24 hours, filter the resulting solution, wash with anhydrous methanol three times, and dry at 60°C to obtain the ZIF-67 material ;

[0040] (3) Weigh 0.5g of ZIF-67 obtained in step (2), spread it on a quartz boat, place it in a tube furnace for pyrolysis, and pyrolyze it at 600°C for 3 hours at a constant temperature to obtain Co nano A Co@C@NCNT material covered with a carbon film on the particle surface.

[0041] (4) W...

Embodiment 2

[0047] This example provides a method for preparing a Co@NCNT material prepared by a reduction-oxidation-reduction strategy, including the following steps:

[0048] (1) Dimethylimidazole (12mmol) was added into anhydrous methanol (75mL), dissolved by ultrasonication for 3min to obtain an organic ligand solution; Co(NO 3 ) 2 ·6H 2 O (3mmol) was dissolved in anhydrous methanol (75mL) to obtain a Co salt solution;

[0049] (2) Add the Co salt solution in step (1) to the organic ligand solution, stir at room temperature for 15 minutes, and after standing for 24 hours, filter the resulting solution, wash with anhydrous methanol three times, and dry at 60°C to obtain the ZIF-67 material ;

[0050] (3) take by weighing the ZIF-67 that 0.5g step (2) obtains, tile in the quartz boat, place tube furnace pyrolysis, pyrolysis atmosphere is the mixed gas of hydrogen and argon (H 2 :Ar=10:90), pyrolyzed at 600°C for 3h at a constant temperature to obtain a Co@C@NCNT material covered wit...

Embodiment 3

[0055] This example provides a method for preparing a Co@NCNT material prepared by a reduction-oxidation-reduction strategy, including the following steps:

[0056] (1) Dimethylimidazole (12mmol) was added into anhydrous methanol (75mL), dissolved by ultrasonication for 3min to obtain an organic ligand solution; Co(NO 3 ) 2 ·6H 2 O (3mmol) was dissolved in anhydrous methanol (75mL) to obtain a Co salt solution;

[0057] (2) Add the Co salt solution in step (1) to the organic ligand solution, stir at room temperature for 15 minutes, and after standing for 24 hours, filter the resulting solution, wash with anhydrous methanol three times, and dry at 60°C to obtain the ZIF-67 material ;

[0058] (3) take by weighing the ZIF-67 that 0.5g step (2) obtains, tile in the quartz boat, place tube furnace pyrolysis, pyrolysis atmosphere is the mixed gas of hydrogen and argon (H 2 :Ar=10:90), pyrolyzed at 600°C for 3h at a constant temperature to obtain a Co@C@NCNT material covered wit...

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Abstract

The invention discloses a Co@NCNT material prepared by a reduction-oxidation-reduction strategy and a preparation method of the Co@NCNT material. The preparation method comprises the following steps: (1) preparing a ZIF-67 material from Co salt and a dimethylimidazole ligand; (2) performing pyrolysis in an inert atmosphere or a reducing atmosphere to obtain Co@C@NCNT in which the surfaces of Co nanoparticles are covered with carbon films; (3) conducting oxidizing in an oxidizing atmosphere, and removing a carbon film at the top end to obtain Co3O4@NCNT; and (4) reducing Co3O4@NCNT in a reducing atmosphere to obtain the Co@NCNT. Compared with Co@C@NCNT, the top ends of the Co nanoparticles in the Co@NCNT are not coated with the carbon films, full contact with reactant molecules is realized, more active sites are exposed, and a carbon carrier and the Co nanoparticles can respectively present solid, shell-core and hollow structures according to different preparation conditions, so the catalytic reaction selectivity and activity of the Co@NCNT are influenced, and the Co@NCNT has potential application prospects.

Description

technical field [0001] The invention belongs to the field of porous materials, and in particular relates to a Co@NCNT material prepared by a reduction-oxidation-reduction strategy and a preparation method thereof. Background technique [0002] Fischer-Tropsch synthesis (FTS) can convert synthesis gas (CO, H 2 ), converted into hydrocarbons with a wide carbon number distribution, which has a wide range of raw materials and high added value of products, which can alleviate the urgent demand for fossil energy today. Co-based catalysts commonly used in FTS have received extensive attention because of their strong catalytic activity, weak water-gas conversion activity, and low carbon deposition. Combine Co with a carrier (such as TiO 2 , C, etc.) can change the electronic environment of Co, improve the dispersion of Co, prevent the sintering of the reaction process, and optimize the reaction activity, selectivity and stability. However, the Co content of traditional supported ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/02B01J20/30B01D53/02B01D53/86B01D53/62B01J27/24B01J35/10B01J37/14B01J37/18C10G2/00
CPCB01J20/02B01J20/205B01D53/02B01D53/864B01J27/24B01J37/14B01J37/18C10G2/33B01D2257/50B01J35/60B01J35/40
Inventor 李映伟詹伟腾王亚晶
Owner SOUTH CHINA UNIV OF TECH
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