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co@ncnt material prepared by reduction-oxidation-reduction strategy and its preparation method

A strategic, oxidative technology, applied in the field of porous materials, to achieve the effect of good activity and selectivity, enhanced adsorption and dissociation ability, and simple operation

Active Publication Date: 2021-11-23
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 its preparation method
  • co@ncnt material prepared by reduction-oxidation-reduction strategy and its preparation method
  • co@ncnt material prepared by reduction-oxidation-reduction strategy and its preparation method

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Embodiment 1

[0037] This embodiment provides a method of preparing a CO @ NCNT material prepared by a reduction-oxidation-reduction strategy, including the following steps:

[0038] (1) Dimethylimidazole (12 mmol) was added to anhydrous methanol (75 mL), and the ultrasound was dissolved, and the organic ligand solution was obtained; CO (NO) 3 ) 2 · 6h 2 O (3 mmol) is dissolved in anhydrous methanol (75 mL) to obtain a Co salt solution;

[0039] (2) The Co salt solution in step (1) is added to the organic ligand solution, stirred at room temperature for 15 min, and then filtered the resulting solution after 24 h, and washed three times, dried three times at 60 ° C to obtain ZIF-67 materials at 60 ° C. ;

[0040] (3) Weigh 0.5G step (2), in the quartz boat, placed in the tube furnace, the pyrolysis atmosphere is argon, at 600 ° C constant temperature hot solution for 3 h, resulting in Co Nano The surface of the particles cover Co @ c @ NCNT material with a carbon film.

[0041] (4) When the temp...

Embodiment 2

[0047] This embodiment provides a method of preparing a CO @ NCNT material prepared by a reduction-oxidation-reduction strategy, including the following steps:

[0048] (1) Dimethylimidazole (12 mmol) was added to anhydrous methanol (75 mL), and the ultrasound was dissolved, and the organic ligand solution was obtained; CO (NO) 3 ) 2 · 6h 2 O (3 mmol) is dissolved in anhydrous methanol (75 mL) to obtain a Co salt solution;

[0049] (2) The Co salt solution in step (1) is added to the organic ligand solution, stirred at room temperature for 15 min, and then filtered the resulting solution after 24 h, and washed three times, dried three times at 60 ° C to obtain ZIF-67 materials at 60 ° C. ;

[0050] (3) Weigh 0.5G step (2), which is paired in the quartz boat, which is placed in a tube furnace, and the pyrolysis atmosphere is mixed with hydrogen and argon (H. 2 : Ar = 10: 90), at 600 ° C constant temperature hot solution 3 h, resulting in the surface of the CO nanoparticle covering ...

Embodiment 3

[0055] This embodiment provides a method of preparing a CO @ NCNT material prepared by a reduction-oxidation-reduction strategy, including the following steps:

[0056] (1) Dimethylimidazole (12 mmol) was added to anhydrous methanol (75 mL), and the ultrasound was dissolved, and the organic ligand solution was obtained; CO (NO) 3 ) 2 · 6h 2 O (3 mmol) is dissolved in anhydrous methanol (75 mL) to obtain a Co salt solution;

[0057] (2) The Co salt solution in step (1) is added to the organic ligand solution, stirred at room temperature for 15 min, and then filtered the resulting solution after 24 h, and washed three times, dried three times at 60 ° C to obtain ZIF-67 materials at 60 ° C. ;

[0058] (3) Weigh 0.5G step (2), which is paired in the quartz boat, which is placed in a tube furnace, and the pyrolysis atmosphere is mixed with hydrogen and argon (H. 2 : Ar = 10: 90), at 600 ° C constant temperature hot solution 3 h, resulting in the surface of the CO nanoparticle covering ...

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Abstract

The invention discloses a Co@NCNT material prepared by a reduction-oxidation-reduction strategy and a preparation method thereof; it comprises the following steps: (1) preparing a ZIF-67 material through a Co salt and a dimethylimidazole ligand; (2) Pyrolysis in an inert atmosphere or a reducing atmosphere to obtain Co@C@NCNT covered with a carbon film on the surface of Co nanoparticles; (3) oxidation in an oxidizing atmosphere to remove the top carbon film to obtain Co 3 o 4 @NCNT; (4) Reduction was performed under a reducing atmosphere to obtain Co@NCNT. Compared with Co@C@NCNT, the top of Co nanoparticles in Co@NCNT has no carbon film coating, which can fully contact with reactant molecules and expose more active sites. According to different preparation conditions, its carbon support, Co nanoparticles can exhibit solid, core-shell, and hollow structures, respectively, which can affect the selectivity and activity of catalytic reactions and have potential application prospects.

Description

Technical field [0001] The invention belongs to the field of porous materials, and specific to CO @ NCNT materials prepared by reduction-oxidation-reduction strategies and preparation methods thereof. Background technique [0002] Fischer Synthesis (FTS) can combine syngas (CO, H 2 ), Converted into a wide range of carbon distributions, its raw material is wide, and the product added value is high, which can alleviate the urgent needs of the fossil energy. The CO base catalyst commonly used by FTS has been widely concerned by the characteristics of strong catalytic activity and weak water conversion, and it is not easy to produce carbon. Will CO with the carrier (such as TiO 2 , C, C, can change the electronics of the CO, increase the dispersion of CO, prevent the reaction process from sintering, and optimize the active activity, selectivity, and stability. However, the conventional load type catalyst is up to 20%, otherwise the CO nanoparticle is prone to agglomerate, which is r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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