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Preparation method of blocky porous carbon with high specific surface area

A high specific surface area, porous carbon technology, applied in the field of preparing high specific surface bulk porous carbon materials, can solve the problems of high cost of supercritical drying, difficult industrialization, complicated process, etc., and achieves high mechanical strength, smooth surface, and preparation method. easy effect

Active Publication Date: 2011-01-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The former needs to first synthesize bulk silicon oxide materials, so the cost is high, the time is long, and it is not easy to industrialize; the latter needs to strictly control the experimental conditions, after a long period of aging, and then conduct CO 2 Supercritical drying, and finally carbonization at high temperature to make bulk carbon materials
Obviously; this method process is complicated, and the cost of supercritical drying is expensive, so there are great limitations in production

Method used

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  • Preparation method of blocky porous carbon with high specific surface area
  • Preparation method of blocky porous carbon with high specific surface area
  • Preparation method of blocky porous carbon with high specific surface area

Examples

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Effect test

Embodiment 1

[0015] Mix phloroglucinol (R): sucrose (S): water (W): hydrochloric acid (HCl; 1M) = 2g: 4g: 10g: 1ml of phloroglucinol and glucose, add deionized water, at 50°C Stir to fully dissolve, then add hydrochloric acid, stir and mix evenly at 50°C, place in a stainless steel pressure-resistant reactor lined with polytetrafluoroethylene, put it in an oven for hydrothermal reaction, and form block hydrothermal charcoal. The obtained material is rinsed with water and ethanol, dried, and then carbonized at 700° C. under the protection of an inert atmosphere to obtain a porous carbon material with a high specific surface area. Nitrogen adsorption test results show that its specific surface area is 400m 2 / g, the pore volume is 0.17cm 3 / g.

Embodiment 2

[0017] Mix resorcinol and glucose according to resorcinol (R): sucrose (S): water (W): citric acid (CA) = 2g: 4g: 10g: 1g, add deionized water, at 50°C Stir to fully dissolve, then add citric acid, stir and mix evenly at 50°C, place in a stainless steel pressure-resistant reactor lined with polytetrafluoroethylene, put it in an oven for hydrothermal reaction, and form block hydrothermal charcoal. The obtained material is rinsed with water and ethanol, dried, and then carbonized at 700° C. under the protection of an inert atmosphere to obtain a porous carbon material with a high specific surface area. Nitrogen adsorption test results show that its specific surface area is 410m 2 / g, the pore volume is 0.2cm 3 / g.

Embodiment 3

[0019] According to phenol (R): glucose (G): water (W): sodium sulfate = 6g: 4g: 10g: 1g, mix phenol and glucose, add deionized water, stir at 50°C to fully dissolve, then add sodium sulfate, Stir and mix evenly at 50°C, place in a stainless steel pressure-resistant reaction kettle lined with polytetrafluoroethylene, put it in an oven for hydrothermal reaction, and form block hydrothermal charcoal. The obtained material is rinsed with water and ethanol, dried, and then carbonized at 900° C. under the protection of an inert atmosphere to obtain a porous carbon material with a high specific surface area. Nitrogen adsorption test results show that its specific surface area is 700m 2 / g, the pore volume is 0.83cm 3 / g.

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Abstract

The invention relates to a preparation method of a blocky porous carbon block with high specific surface area, which comprises the following steps: using saccharides and phenols as reaction monomers and adding inorganic acid / organic acid / sulphate as the catalyst to form blocky carbon by a hydrothermal carbonization method, and then carbonizing immediately in an inert atmosphere to obtain the porous carbon material with high specific surface area, wherein the inside of the material has abundant micropores and mesopores, and the BET can be up to 700m<2> / g. The method is mainly characterized in that the preparation process adopts the hydrothermal carbonization method requiring moderate conditions, water is in a high-pressure and high-temperature state in the hydrothermal process, the solubility of the monomers is raised with the increase of the temperature in the heating process, the reaction monomers are polymerized into the stable blocky carbon material under the action of the catalystand the stable blocky carbon material are immediately carbonized into the blocky porous carbon material at high temperature at the inert atmosphere. The material can be furtheractivated to increase the specific surface area and the pore volume, thereby having broad application prospects in the aspects of adsorption, electrode materials and catalyst carriers.

Description

technical field [0001] The invention relates to a method for preparing a block porous carbon material with a high specific surface area by a hydrothermal carbonization method. Background technique [0002] Porous carbon materials are a very important class of inorganic materials, which have a wide range of applications in adsorption, separation, energy (electric double layer capacitors, battery materials, wet storage of natural gas, etc.), catalysis, sensor devices, electrode materials, etc. In practical industrial applications, due to the advantages of strong mechanical stability, easy recycling and easy handling of bulk porous carbon materials, it is easier to use and process. The bulk carbon for industrial application is mainly prepared by mixing activated carbon powder with a binder and then injection molding. The disadvantage of this treatment method is that the type and amount of binder have a great influence on the mechanical strength and pore volume of the bulk carb...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 王艳芹张薇莉任家文卢冠忠郭杨龙郭耘刘晓晖张志刚王筠松龚学庆
Owner EAST CHINA UNIV OF SCI & TECH
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