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Hierarchical-pore nitrogen-doped carbon material and preparation method thereof

An aza-carbon and hierarchical pore technology, which is applied in the field of hierarchical porous aza-carbon materials and their preparation, can solve the problems of poor diffusion performance, poor adsorption selectivity, easy blockage of pores, etc., so as to achieve enhanced gas adsorption performance and enhanced adsorption. , the effect of improving the adsorption strength

Active Publication Date: 2017-08-18
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a hierarchical porous nitrogen heterocarbon material and its preparation method, which overcomes the poor adsorption selectivity when the porous carbon material existing in the prior art is used as an adsorbent , or poor diffusion performance, easy clogging of pores, etc.

Method used

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  • Hierarchical-pore nitrogen-doped carbon material and preparation method thereof
  • Hierarchical-pore nitrogen-doped carbon material and preparation method thereof
  • Hierarchical-pore nitrogen-doped carbon material and preparation method thereof

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Effect test

Embodiment 1

[0045] A kind of core-shell structure hierarchical porous azacarbon material, its preparation method comprises the steps:

[0046] (1) Slowly add 40 g of water dissolved with 0.7 g of zinc nitrate hexahydrate into 160 g of water dissolved with 6.5 g of 2-methylimidazole, and stir at room temperature for 2 hours to obtain ZIF-8 crystal particles containing highly dispersed metal-organic framework materials the stock solution;

[0047] (2) Take 5 g of the metal-organic framework material ZIF-8 stock solution, add 49 g of water, 2.2 g of ammonia water, 2.2 g of nonionic surfactant F127, 1.1 g of resorcinol, and 0.4 g of formaldehyde solution, stir at room temperature for 1 hour, and again Add 0.6g urea and 0.2g formaldehyde solution and stir for 0.5h;

[0048] (3) Transfer the above solution into a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 80° C. for 24 hours. After the reaction is completed, filter, wash, and dry to obtain a metal-organic framework co...

Embodiment 2

[0054] A kind of core-shell structure hierarchical porous azacarbon material, its preparation method comprises the steps:

[0055] (1) Slowly add 40 g of water dissolved with 0.7 g of zinc nitrate hexahydrate into 160 g of water dissolved with 6.5 g of 2-methylimidazole, and stir at room temperature for 2 hours to obtain ZIF-8 crystal particles containing highly dispersed metal-organic framework materials the stock solution;

[0056] (2) Take 10g of the metal-organic framework material ZIF-8 stock solution, add 44g of water, 2.2g of ammonia water, 2.2g of nonionic surfactant F127, 1.1g of phenol, and 0.4g of terephthalaldehyde solution, stir at room temperature for 1 hour, and then add 0.6g urea and 0.2g terephthalaldehyde solution, stirred for 0.5h;

[0057] (3) Transfer the above solution into a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 200° C. for 3 hours. After the reaction is completed, filter, wash, and dry to obtain a metal-organic framework ...

Embodiment 3

[0061] A kind of core-shell structure hierarchical porous azacarbon material, its preparation method comprises the steps:

[0062] (1) Slowly add 40 g of water dissolved with 0.7 g of zinc nitrate hexahydrate into 160 g of water dissolved with 6.5 g of 2-methylimidazole, and stir at room temperature for 2 hours to obtain ZIF-8 crystal particles containing highly dispersed metal-organic framework materials the stock solution;

[0063] (2) Take 20 g of the metal-organic framework material ZIF-8 stock solution, add 34 g of water, 2.2 g of sodium bicarbonate, 2.2 g of nonionic surfactant P123, 1.1 g of pyroglucinol, and 0.4 g of acetaldehyde solution, and stir for 1 h at room temperature , add 0.6g urea and 0.2g acetaldehyde solution again, stir for 0.5h;

[0064] (3) Transfer the above solution into a hydrothermal reaction kettle, and conduct a hydrothermal reaction at 40° C. for 72 hours. After the reaction is completed, filter, wash, and dry to obtain a metal-organic framework...

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Abstract

The invention discloses a hierarchical-pore nitrogen-doped carbon material and a preparation method thereof and belongs to the field of material chemistry. The hierarchical-pore nitrogen-doped carbon material is prepared from components of raw materials as follows: a metal-organic framework material, a structure-directing agent, phenol, aldehyde, urea and an alkaline catalyst in the mass ratio being 1:(1-30):(0.5-20):(0.5-20):(0.1-10):(0.5-2). The mesoporous shell structure of the hierarchical-pore nitrogen-doped carbon material facilitates rapid dispersion of gas in pore passages, inside microporous cores facilitate gas adsorption, and meanwhile, the adsorption strength of pore passage surfaces and gas molecules is further improved as well through doping of nitrogen atoms in mesoporous shells and the microporous cores. Under the joint action of the mesoporous shell structure, the microporous cores and nitrogen atom doping, the provided hierarchical-pore nitrogen-doped carbon material has enhanced gas adsorption performance as compared with existing single-core and single-shell carbon materials.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a hierarchically porous azacarbon material and a preparation method thereof. Background technique [0002] Porous carbon materials are highly sought after by researchers at home and abroad because of their advantages such as high specific surface area, rich pores, easy surface modification, high temperature resistance, acid and alkali resistance, electrical conductivity, heat transfer, and low cost. , catalysis, sensing, medicine and other fields have been widely used. [0003] Porous carbon materials have good adsorption performance and cycle stability when used as adsorbents, but the adsorption selectivity is relatively poor. In order to improve its adsorption selectivity, researchers often use heteroatom nitrogen doping into the carbon skeleton to increase the surface polarity and the number of basic sites of porous carbon materials, thereby improving the adsorpt...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C01B32/05
CPCB01D53/02B01D2253/102B01D2257/504B01J20/0259B01J20/20B01J20/28014B01J2220/42B01J2220/4806B01J2220/4812Y02C20/40
Inventor 张中正孙楠楠魏伟孙予罕
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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