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A kind of acid-catalyzed carbon airgel and preparation method thereof

A carbon aerogel and wet gel technology is applied in the field of acid-catalyzed carbon aerogel and its preparation, which can solve the problems of high price, affecting the scope of use, unfriendly environment, etc., achieves low equipment requirements, and is conducive to industrial development. And promotion and application, the effect of broad market prospects

Active Publication Date: 2018-08-14
ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, some foreign scholars have tried to use new weak acid or weak base or acid-base synergistic catalysts to prepare carbon aerogels with superior performance and structure, but these catalysts are either expensive or environmentally unfriendly, thus affecting their scope of use.

Method used

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  • A kind of acid-catalyzed carbon airgel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of organic wet gel: mixing resorcinol and phloroglucinol with a molar ratio of 7:1, and then mixing the mixture of resorcinol and phloroglucinol with formaldehyde according to the amount of substance Mix 1:2, add deionized water to prepare a reaction solution with a certain mass fraction of 35%, then add 2,4-dihydroxybenzoic acid, 2,4-dihydroxybenzoic acid, resorcinol and phloroglucinol The molar ratio of the mixture is 1:250, the above reaction solution is mixed evenly by ultrasonic waves, sealed, and kept at 40°C to 50°C for a full reaction for 1 day to obtain a resorcinol-phloroglucinol-formaldehyde wet gel.

[0034] (2) Solvent replacement: Soak the resorcinol-phloroglucinol-formaldehyde wet gel prepared in step (1) in acetone for solvent replacement, and replace the acetone every 24 hours for 3 to 5 times.

[0035] (3) Atmospheric pressure drying: At normal temperature and pressure, after the natural volatilization of acetone is complete, the dry or...

Embodiment 2

[0039] (1) Preparation of organic wet gel: mixing resorcinol and phloroglucinol with a molar ratio of 7:1, and then

[0040] The mixture of hydroquinone and phloroglucinol is mixed with formaldehyde according to the ratio of the amount of substances of 1:2, and deionized water is added to prepare a reaction solution with a mass fraction of 35%, and then added with resorcinol and phloroglucinol Phenol is mixed with 2,4-dihydroxybenzoic acid with a molar ratio of 1:500, the reaction solution is mixed evenly by ultrasonic waves, sealed, placed in a constant temperature water bath, and fully reacted at 40°C to 50°C for 1 day to obtain 2,4-Dihydroxybenzoic acid catalyzed resorcinol-phloroglucinol-formaldehyde wet gels.

[0041] (2) Solvent replacement: Soak the 2,4-dihydroxybenzoic acid-catalyzed resorcinol-phloroglucinol-formaldehyde wet gel prepared in step (1) in acetone solution for solvent replacement, every 24 hours Replace the acetone once, and replace it 4 times during the...

Embodiment 3

[0046] (1) Preparation of organic wet gel: mixing resorcinol and phloroglucinol with a molar ratio of 7:1, and then

[0047] The mixture of hydroquinone and phloroglucinol is mixed with formaldehyde according to the ratio of the amount of substances of 1:2, and deionized water is added to prepare a reaction solution with a mass fraction of 35%, and then added with resorcinol and phloroglucinol Phenol mixed with 2,4-dihydroxybenzoic acid with a molar ratio of 1:800, the reaction solution was mixed evenly by ultrasonic waves, sealed, and left in a constant temperature water bath at 40°C to 50°C to fully react for 1 day to obtain Hydroquinone-phloroglucinol-formaldehyde wet gel.

[0048] (2) Solvent replacement: Soak the 2,4-dihydroxybenzoic acid-catalyzed resorcinol-phloroglucinol-formaldehyde wet gel prepared in step (1) in acetone solution for solvent replacement, every 24 hours The acetone was replaced once, during which it was replaced 5 times, and the water and other impur...

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Abstract

The invention relates to an acid-catalyzed carbon aerogel and a preparing method thereof. The specific surface area of the carbon aerogel ranges from 650 m<2> / g to 700 m<2> / g, the particle size distribution ranges from 6.0 nm to 8.6 nm, the pore volume ranges from 0.56 cm<3> / g to 0.79 cm<3> / g, and the specific capacitance ranges from 94 F to 250 F. The preparing method comprises the first step of preparation of organic wet gel, the second step of solvent replacement, the third step of ambient pressure drying, and the fourth step of high-temperature carbonization. According to the acid-catalyzed carbon aerogel and the preparing method thereof, a mixture of resorcinol and phloroglucinol and formaldehyde serve as raw materials, 2,4-dihyoxybenzoicacid is added, and the organic wet gel is prepared with a sol-gel method; 2,4-dihyoxybenzoicacid is introduced into the raw materials to prepare the acid-catalyzed carbon aerogel, and acid serving as a catalyst makes gel formed quickly in a reaction system; meanwhile, 2,4-dihyoxybenzoicacid can serve as a reactant to participate in the reaction in the reaction process so that the reaction speed can be increased, the specific surface area can be increased, and the conductivity can be enhanced while the aperture and the pore volume can be increased.

Description

technical field [0001] The invention relates to an acid-catalyzed carbon airgel and a preparation method thereof. Background technique [0002] In 1931, Kistler of the United States mixed sodium silicate and hydrochloric acid to form a hydrogel, and replaced the water with ethanol to obtain an alcohol gel. 6.24 MPa) to obtain silica airgel, the density is 0.03kg / cm3~0.80 kg / cm3, and the porosity is 86%~98%. The gaps of the gel are filled with liquid, and dry under normal conditions to obtain xerogel ( xerogel), if after supercritical drying, the gaps are filled with gas, so Kistler pioneered the concept of airgel. The preparation method of carbon airgel has attracted many researchers to conduct in-depth research since it was reported by Pekala in 1989. High specific surface area, high specific capacitance, superior pore structure, and low density make carbon aerogels have great advantages in many application fields. The preparation method of Pekala carbon airgel is to use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05
CPCC01P2006/12C01P2006/14C01P2006/17C01P2006/40
Inventor 闫美芳许跃龙刘振法张利辉王莎莎刘海花
Owner ENERGY RESOURCES INST HEBEI ACADEMY OF SCI