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Graphite carbon wrapped nano-cobalt mesoporous composite material, its preparation method and application

A composite material and nano-cobalt technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as poor performance, unfavorable mass transfer and diffusion, etc., to achieve wide source of raw materials, mesoporous Uniform pore size distribution and simple preparation process

Active Publication Date: 2021-01-26
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cobalt / graphite carbon composite material prepared by one-step high-temperature pyrolysis of ZIF-67 material has a high specific surface area and a pore structure dominated by micropore distribution. The mass transfer diffusion is not favorable, especially in the application of gas-phase catalytic reactions at high space velocities.

Method used

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  • Graphite carbon wrapped nano-cobalt mesoporous composite material, its preparation method and application
  • Graphite carbon wrapped nano-cobalt mesoporous composite material, its preparation method and application
  • Graphite carbon wrapped nano-cobalt mesoporous composite material, its preparation method and application

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preparation example Construction

[0029] A preparation method of graphite carbon wrapped nano-cobalt mesoporous composite material, which comprises the following steps:

[0030] Add the cobalt nitrate aqueous solution to the 2-methylimidazole aqueous solution, mix and react, centrifuge, and dry once to obtain a solid; preferably, before adding the cobalt nitrate aqueous solution to the 2-methylimidazole aqueous solution, mix nano-state silicon The imidazole aqueous solution is mixed and stirred evenly; preferably, the mass ratio of silicon dioxide and 2-methylimidazole is 0-5:5-25; preferably, the mass fraction of 2-methylimidazole aqueous solution is 5%-25%; preferably Yes, the mixing and stirring time is 2-4 hours, and the mixing and stirring temperature is 25-35°C; preferably, the mass ratio of cobalt nitrate to 2-methylimidazole is 1-5:10-50; preferably, the cobalt nitrate aqueous solution The mass fraction is 3% to 18%; preferably, the mixing reaction time is 5 to 8 hours; the mixing reaction temperature ...

Embodiment 1

[0036] The embodiment of the present invention provides a graphite carbon-wrapped nano-cobalt mesoporous composite material, the preparation method of which is as follows:

[0037] S11. Weigh 5.5 g of 2-methylimidazole and dissolve it in 20 g of deionized water, stir and dissolve at 25° C. to obtain a 2-methylimidazole solution;

[0038]S12. Weigh 0.5 g of cobalt nitrate salt and dissolve it in 3 g of deionized water. After ultrasonic dispersion, add it to the above-mentioned 2-methylimidazole solution and react for 6 hours, then use water twice and methanol once to centrifuge at 8000 rpm, place Vacuum drying at 80°C for 24 hours gave a blue-purple solid;

[0039] S13. After pulverizing the blue-purple solid, place it in a tube furnace and calcinate at 700° C. for 4 hours in a nitrogen (40 mL / min) atmosphere to obtain a black powder;

[0040] S14. Disperse the black powder in 60mL of 1mol / L sodium hydroxide solution and stir, heat up to 60°C and react for 24h, wash with deion...

Embodiment 2

[0042] The embodiment of the present invention provides a graphite carbon-wrapped nano-cobalt mesoporous composite material, the preparation method of which is as follows:

[0043] S21. Weighing 5.5 g of 2-methylimidazole and dissolving it in 20 g of deionized water, stirring and dissolving at 25° C., adding 0.5 g of nano-colloidal silica, and continuously stirring and dispersing for 2 hours to obtain a mixed solution;

[0044] S22. Weigh 0.5 g of cobalt nitrate salt and dissolve it in 3 g of deionized water. After ultrasonic dispersion, add it to the above mixed solution for 6 hours of reaction, use water twice and methanol once to centrifuge at 8000 rpm, and place in a vacuum at 80 ° C. Dry for 24h to obtain a blue-purple solid;

[0045] S23. After pulverizing the blue-purple solid, place it in a tube furnace and calcinate at 700° C. for 4 hours in a nitrogen (40 mL / min) atmosphere to obtain a black powder;

[0046] S24. Disperse the black powder in 60mL of 1mol / L sodium hy...

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Abstract

A graphite carbon-wrapped nano-cobalt mesoporous composite material, its preparation method and application, belong to the field of carbon composite materials. The preparation method of the graphite carbon-wrapped nano-cobalt mesoporous composite material comprises the following steps: adding an aqueous solution of cobalt nitrate into an aqueous solution of 2-methylimidazole, mixing and reacting, centrifuging, and drying once to obtain a solid; pulverizing the solid and calcining it under an inert atmosphere to obtain a powder ; Disperse the powder in the aqueous alkali solution, stir and react, wash and dry again. The preparation method of the graphite carbon-wrapped nano-cobalt mesoporous composite material has the advantages of wide source of raw materials, simple preparation process, and suitability for large-scale industrial production, and can prepare a catalyst material with excellent ammonia decomposition performance. In addition, the present invention also relates to a graphite carbon-wrapped nano-cobalt mesoporous composite material prepared by the above method and its application in a catalyst for ammonia decomposition to produce hydrogen.

Description

technical field [0001] The invention relates to the field of carbon composite materials, and in particular to a graphite carbon-wrapped nano-cobalt mesoporous composite material, its preparation method and application. Background technique [0002] Metal-organic frameworks (MOFs) materials have received extensive attention and research due to their ordered and regular structure, high specific surface area, and structural tunability. As a rapidly developing emerging porous material, they have more Attractive application prospects. However, due to the relatively poor stability of MOFs, their practical application and development are greatly limited. [0003] In order to further promote the application and development of MOFs materials, the shortcomings of MOFs materials that are easy to decompose when heated can be used to prepare stable nanoporous carbon materials by high-temperature calcination and carbonization. Among them, the preparation of cobalt-carbon nanocomposite s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J35/10B01J37/08C01B3/04
CPCC01B3/047B01J23/75B01J37/086B01J35/61B01J35/64Y02E60/36
Inventor 李雷严金龙孙林邵景玲
Owner YANCHENG INST OF TECH
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