Method for preparing high specific area carbon aerogel

A high specific surface area, carbon aerogel technology, applied in chemical instruments and methods, colloidal chemistry, colloidal chemistry, etc., can solve problems such as high cost, high operational risk, and inability to fully utilize the structural advantages of carbon aerogels.

Inactive Publication Date: 2007-01-10
TONGJI UNIV
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Problems solved by technology

[0003] The traditional preparation method adopts the supercritical drying process, which requires high cost and high risk of operation, and is not suitable for the industrial development of carbon aerogels [Document 1: R.W.Pekala, F.M.Kong, J.Phys.(Paris) College. C4, 33(1989).]
After adopting the atmospheric pr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0031] Example 1: Take resorcinol, formaldehyde, water as raw material, sodium carbonate as catalyst. By resorcinol, formaldehyde, water and sodium carbonate by resorcinol: formaldehyde=1 (mol ratio), resorcinol: sodium carbonate=2000 (mol ratio), Stir. The obtained sol was gelled at a constant temperature (at 20°C for 30 hours, at 60°C for 30 hours, at 80°C for 80 hours) to form a resorcinol-formaldehyde organic wet gel. Replace it in isopropanol solvent. Then, dry under natural conditions to obtain resorcinol-formaldehyde organic airgel. Then carbonize at high temperature for 12 hours under nitrogen atmosphere to obtain carbon airgel. Finally, gas activation is carried out in carbon dioxide gas (ventilation rate: 10ml / min; activation time: 8 hours; activation temperature: 1000°C) to obtain carbon airgel with high BET specific surface area. BET specific surface area is 1323m 2 / g.

example 2

[0032] Example 2: Take resorcinol, formaldehyde, water as raw material, sodium carbonate as catalyst. By resorcinol, formaldehyde, water and sodium carbonate by resorcinol: formaldehyde=1 (mol ratio), resorcinol: sodium carbonate=2000 (mol ratio), Stir. The obtained sol was gelled at a constant temperature (at 20°C for 30 hours, at 60°C for 30 hours, at 80°C for 80 hours) to form a resorcinol-formaldehyde organic wet gel. It was replaced in n-hexane solvent. Then, it was dried at 35° C. to obtain a resorcinol-formaldehyde organic airgel. Then carbonize at high temperature for 12 hours under nitrogen atmosphere to obtain carbon airgel. Finally, gas activation is carried out in carbon dioxide gas (ventilation rate: 40ml / min; activation time: 7 hours; activation temperature: 800°C) to obtain carbon airgel with high BET specific surface area. BET specific surface area is 1415m 2 / g.

example 3

[0033] Example 3: Take resorcinol, formaldehyde, water as raw material, sodium carbonate as catalyst. By resorcinol, formaldehyde, water and sodium carbonate by resorcinol: formaldehyde=0.8 (molar ratio), resorcinol: sodium carbonate=2000 (molar ratio), Stir. The obtained sol was gelled at a constant temperature (at 20°C for 30 hours, at 60°C for 30 hours, at 85°C for 80 hours) to form a resorcinol-formaldehyde organic wet gel. Replace it in acetone solvent. Then, dry under natural conditions to obtain resorcinol-formaldehyde organic airgel. Then carbonize at high temperature for 12 hours under nitrogen atmosphere to obtain carbon airgel. Finally, gas activation is carried out in carbon dioxide gas (ventilation rate: 80ml / min; activation time: 5 hours; activation temperature: 1100°C) to obtain carbon airgel with high specific surface area. The BET specific surface area is 1780m 2 / g.

[0034]The chemical reagents used are all products of Shanghai Chemical Reagent Compan...

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Abstract

This invention provides a preparation method for a high ratio surface area carbon gel, which takes resorcin and formaldehyde as the raw materials, sodium carbonate as the catalyst to prepare carbon gel by sol-gel reaction and ordinary pressure and high temperature carbonization and takes CO2 as the activating agent to carry out gas activation process to get the high ratio surface area carbon gel, which avoids the traditional complicated technology of exceeding critical dryness and makes up the shortcomings of low ratio surface area brought with the normal pressure dryness.

Description

technical field [0001] The invention relates to a preparation method of carbon airgel, in particular to a preparation method of high specific surface area carbon airgel. Background technique [0002] Carbon airgel is a new type of nanoporous material. It has low density, high specific surface area and high porosity, and exhibits strong adsorption and catalytic ability, low thermal conductivity, low acoustic impedance and other characteristics. In addition, it also has good electrical conductivity, photoconductivity and magnetic properties, making it a single choice in electrode materials, electrochemical supercapacitors with high power density and high energy density, seawater desalination electrodes, new high-efficiency rechargeable batteries, and fine-mesh photocells. Photon counters and other aspects have good application prospects. [0003] The traditional preparation method adopts the supercritical drying process, which requires high cost and high risk of operation, a...

Claims

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Application Information

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IPC IPC(8): C01B31/02B01J13/00
Inventor 沈军侯今强吴广明周斌倪星元解德滨薛辉
Owner TONGJI UNIV
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