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Porous carbon composite material for adsorbing CO2 and preparation method and application thereof

A composite material, porous carbon technology, applied in the direction of adsorption, separation methods, chemical instruments and methods, etc., can solve the problems of poor adsorption selectivity, reduced carbon dioxide adsorption performance, small adsorption capacity, etc., and achieve good high-temperature adsorption effect.

Inactive Publication Date: 2010-07-21
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adsorption capacity of activated carbon adsorbents for carbon dioxide is very small, only 40-100mg CO 2 / g adsorbent, and the adsorption selectivity is very poor, the adsorption selectivity to carbon dioxide in the atmosphere of nitrogen and oxygen is only 60-70%
Although molecular sieve adsorbents have a large adsorption capacity for carbon dioxide (60-140mg CO 2 / g adsorbent), but the adsorption selectivity is poor, especially affected by water. In the presence of water, the adsorption performance of molecular sieve adsorbents on carbon dioxide is greatly reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] an adsorbed CO 2 Porous carbon composite material and its preparation method and application, the method comprises the following steps:

[0043](1) Sol-gel reaction: mix resorcinol and formaldehyde in 20g deionized water at a molar ratio of 1:2 to obtain an organic precursor, wherein resorcinol is 13g and formaldehyde is 7g, and the organic precursor is 0.2g sodium carbonate was added as a catalyst, and 50g of commercially available silica sol SM-30 was added thereto to obtain a mixture. The particle diameter of the silica sol was 7nm, and deionized water was added to control the content of the mixture to be 70g / 100g deionized water, place the mixture in a water bath at 85°C, and age for 3 days to obtain an organic-inorganic composite hydrogel;

[0044] (2) Solvent replacement and drying: Soak the organic-inorganic composite hydrogel in ethanol for 3 days, replace fresh ethanol every day, replace the solvent deionized water in the organic-inorganic composite hydrogel,...

Embodiment 2

[0049] an adsorbed CO 2 Porous carbon composite material and its preparation method and application, the method comprises the following steps:

[0050] (1) Sol-gel reaction: phenol, formaldehyde, and melamine are mixed in 30g deionized water in a molar ratio of 1:2:2 to obtain an organic precursor, wherein phenol is 10g, formaldehyde is 4.5g, and melamine is 5.5g. Add 0.2g sodium carbonate as catalyst in the organic precursor, then add 20g commercially available silica sol HS-30 thereinto, obtain mixture, the particle diameter of this silica sol is 12nm, replenish deionized water, control the The content is 40g / 100g deionized water, the mixture is placed in a water bath at 80°C, and aged for 2 days to obtain an organic-inorganic composite hydrogel;

[0051] (2) Solvent replacement and drying: Soak the organic-inorganic composite hydrogel in n-propanol for 2 days, replace fresh n-propanol every day, replace the solvent deionized water in the organic-inorganic composite hydroge...

Embodiment 3

[0056] an adsorbed CO 2 Porous carbon composite material and its preparation method and application, the method comprises the following steps:

[0057] (1) Sol-gel reaction: resorcinol, formaldehyde, melamine are mixed in 20g deionized water in molar ratio 1: 2: 1, obtain organic precursor, wherein resorcinol is 11g, and formaldehyde is 5g, Melamine 4g, in the organic precursor, add 0.4g sodium carbonate as catalyst, then add 60g commercially available silica sol SM-30 thereinto, obtain mixture, the particle diameter of this silica sol is 7nm, replenish deionized water , controlling the content of the mixture to be 80g / 100g deionized water, placing the mixture in a water bath at 80°C, and aging for 5 days to obtain an organic-inorganic composite hydrogel;

[0058] (2) Solvent replacement and drying: Soak the organic-inorganic composite hydrogel in ethanol for 3 days, replace fresh n-propanol every day, replace the solvent deionized water in the organic-inorganic composite hyd...

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Abstract

The invention relates to a porous carbon composite material for adsorbing CO2 and a preparation method and application thereof. The material comprises the following components in parts by weight: 100 parts of organic precursor, 1-2 parts of catalyst, 0-300 parts of inorganic template agent and 15-200 parts of polyethyleneimine. The organic precursor, the catalyst and the inorganic template agent are mixed and aged, and then the porous carbon composite material for adsorbing the CO2 is obtained after the processes of drying, carbonization, inorganic template agent removal and the loading of the polyethyleneimine. The material is arranged in a fixed bed adsorption tower to adsorb carbon dioxide. Compared with the prior art, the invention has the advantages of high adsorption capacity, high adsorption selectivity, good high-temperature adsorption effect and good absorption-desorption narrow temperature operation, and water has small influence on the adsorption, and even promotes the adsorption of the carbon dioxide.

Description

technical field [0001] The invention relates to a composite material and its preparation method and application, in particular to a CO adsorption 2 Porous carbon composite material and its preparation method and application. Background technique [0002] In recent years, due to the burning of fossil fuels, the concentration of carbon dioxide in the atmosphere has been increasing, and the resulting "greenhouse effect" has become an increasing threat to human production and life. The removal of carbon dioxide in flue gas is a very serious and important task. Urgent task. In addition to the removal of carbon dioxide in flue gas, the removal of carbon dioxide in natural gas, petroleum associated gas, coal gas, and shift gas is also an important task in the chemical process. [0003] At present, the removal of carbon dioxide mainly includes wet and dry methods. The wet method is mainly the alcohol amine method, which removes carbon dioxide through the process of low temperatur...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01D53/02C01B31/20C01B32/50
CPCY02C10/08Y02A50/20Y02C20/40Y02P20/151
Inventor 凌立成陈庆军龙东辉刘小军乔文明
Owner EAST CHINA UNIV OF SCI & TECH
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