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Super-pure carbon aerogel with superhigh specific surface area based on carbon dioxide activating and pore forming and preparation method thereof

A carbon airgel and pore-making technology, applied in the field of airgel, can solve the problems of increased cost and waste of raw materials, and the specific surface area of ​​carbon airgel is not high, so as to avoid high cost and danger, optimize the characteristics of specific surface area and Microscopic pore characteristics, effect of increasing specific surface area

Active Publication Date: 2018-11-23
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese Patent Publication No. CN1891622 reports a method for preparing carbon aerogels at normal pressure. In order to achieve drying under normal pressure without causing shrinkage of pores and structural damage, solvents such as acetone, methyl ethyl ketone, and cyclohexane with low surface tension are used to carry out the process. Sufficient solvent exchange to replace the formaldehyde and other fluids in the pores, thus realizing the preparation of carbon airgel by atmospheric drying, but this atmospheric drying method requires a large amount of solvent exchange, which greatly increases the cost and waste of raw materials
Moreover, the specific surface area of ​​the carbon airgel prepared by drying under normal pressure is still not high.

Method used

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  • Super-pure carbon aerogel with superhigh specific surface area based on carbon dioxide activating and pore forming and preparation method thereof
  • Super-pure carbon aerogel with superhigh specific surface area based on carbon dioxide activating and pore forming and preparation method thereof
  • Super-pure carbon aerogel with superhigh specific surface area based on carbon dioxide activating and pore forming and preparation method thereof

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preparation example Construction

[0074] The present invention also provides a kind of preparation method of carbon airgel, comprising the following steps:

[0075] 1) After mixing phenolic compounds, aldehyde compounds, organic basic catalysts and solvents, aging under airtight conditions to obtain solid products;

[0076] 2) drying the solid product obtained in the above steps to obtain a phenolic polymer;

[0077] 3) After the organogel obtained in the above steps is subjected to carbonization treatment and activated pore-forming, carbon airgel is obtained;

[0078] The carbonization treatment and activation pore formation include carbonization treatment followed by activation pore formation, or activation pore formation while carbonization treatment is performed.

[0079] The selection, ratio and parameters of raw materials or products in the above-mentioned preparation method of the present invention, as well as the corresponding optimization principles, etc., unless otherwise specified, are the same as ...

Embodiment 1

[0107] Slowly add 0.3g of resorcinol into 2.7mL of formaldehyde solution, stir at room temperature for 10min, then add 0.005g of hexamethylenetetramine, pour into 20mL of ethanol solution at the same time, and stir evenly. Then the obtained solution was sealed and placed in an oven at 80° C. for 3 days of heat preservation and aging. The aged phenolic gel polymer was taken out and placed in the air for natural drying for 5 hours. Then the phenolic gel was dried in an oven at 80 °C for 2 days. The completely dried phenolic gel was carbonized in a high-temperature furnace filled with argon at 700°C for 4 hours. In order to further obtain carbon aerogels with ultra-high specific surface area, in the final stage of carbonization, carbon dioxide gas is introduced at the same time. Specific surface area of ​​ultrapure carbon aerogels.

[0108] The carbon airgel prepared in Example 1 of the present invention was characterized.

[0109] see figure 1 , figure 1 It is the XRD diff...

Embodiment 2

[0115] Slowly add 0.3g of resorcinol into 5.5mL of acetaldehyde solution, stir at room temperature for 20min, then add 0.005g of hexamethylenetetramine, pour into 15mL of ethanol solution at the same time, and stir evenly. Then the obtained solution was sealed and placed in an oven at 80° C. for 3 days of heat preservation and aging. The aged phenolic gel polymer was taken out and placed in the air for natural drying for 5 hours. Then the phenolic gel was dried in an oven at 80 °C for 2 days. The completely dried phenolic gel was carbonized at 800°C for 2 hours in a high-temperature furnace filled with argon. In order to further obtain carbon aerogels with ultra-high specific surface area, in the final stage of carbonization, carbon dioxide gas is introduced at the same time. Specific surface area of ​​ultrapure carbon aerogels.

[0116] The carbon airgel prepared in Example 2 of the present invention was characterized.

[0117] see image 3 , image 3 Transmission elect...

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Abstract

The invention provides a carbon aerogel. The carbon aerogel is of a three-dimensional network structure stacked by carbon particles; the surface of the carbon particle is of a micropore structure; thecarbon aerogel is a super-pure carbon aerogel without metal element impurities. The carbon aerogel has the advantages that a uniform mesopore structure is formed, the stereo feel of the three-dimensional network is strong, the space network structure is stacked by the carbon microspheres, the microspheres are tightly distributed and connected, and the whole structure is complete; the carbon aerogel has the mesopore structure stacked by the carbon microspheres, and the carbon microsphere self has a large amount of micropore structures, so as to enhance the specific surface area of the carbon aerogel, and the BET specific surface area can reach about 1300m<2> / g; the normal-pressure drying method is adopted, the solvent exchange is avoided, the inorganic metal alkaline catalyst is not used,and the super-pure carbon aerogel with good biocompatibility is obtained; the carbon aerogel can be widely applied to the fields of food-level medicine loading, catalyst loading, material adsorbents,energy storage materials and the like.

Description

technical field [0001] The invention relates to the technical field of aerogels, in particular to a carbon aerogel and a preparation method thereof, in particular to an ultra-pure carbon aerogel with an ultra-high specific surface area based on carbon dioxide activated pore formation and a preparation method thereof. Background technique [0002] Airgel, also known as xerogel, is a solid material form, a highly dispersed solid material that is composed of colloidal particles or polymer molecules aggregated into a nanoporous network structure, and filled with a gaseous dispersion medium in the pores , which has properties such as ultra-low density, high specific surface area, high porosity and excellent thermal insulation, and is used in super thermal insulation materials, sound insulation materials, particle detectors, low dielectric constant airgel films, inertial targeting materials, etc. Has a wide range of applications. [0003] There are many types of aerogels, includi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05B01J13/00B01J20/20B01J20/28B01J21/18
CPCB01J13/0091B01J20/20C01B32/05B01J20/28014B01J20/28066B01J20/28078B01J21/18B01J35/23Y02C20/40
Inventor 张和平潘月磊程旭东龚伦伦
Owner UNIV OF SCI & TECH OF CHINA
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