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Manufacturing methods of mesoporous carbon structure with spray drying or spray pyrolysis and composition thereof

A technology of spray pyrolysis and pyrolysis, which is applied in the fields of carbon compounds, chemical instruments and methods, catalyst activation/preparation, etc. It can solve the problems of difficulty in preparing templates, inability to obtain pore size and shape, time-consuming, etc.

Inactive Publication Date: 2009-09-23
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this template synthesis method is that it is easy to introduce pores in the carbon, but the problem with this method is that it is difficult to prepare the template, and the process is complicated and time-consuming
In particular, if the uniform mixing of the carbon precursor and the template in the liquid state cannot be achieved, the pore structure in the resulting porous carbon particles is not uniform, and the desired pore size and shape cannot be obtained.

Method used

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  • Manufacturing methods of mesoporous carbon structure with spray drying or spray pyrolysis and composition thereof
  • Manufacturing methods of mesoporous carbon structure with spray drying or spray pyrolysis and composition thereof
  • Manufacturing methods of mesoporous carbon structure with spray drying or spray pyrolysis and composition thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 5 g of sucrose and 8 g of silica particles (Ludox AS-40) having an average particle diameter of about 10 nm were dissolved in 80 ml of water at room temperature, and then 4 ml of concentrated sulfuric acid was slowly added thereto. The solution was stirred for 12 hours, and then nitrogen gas at a temperature of 150° C. was blown into the solution using a spray dryer while spraying out fine droplets of the solution, thereby preparing spherical particles composed of a mixture of sugar polymer and Ludox particles. The spherical particles were carbonized in a pyrolysis furnace at 800°C for 1 hour under a nitrogen atmosphere, and then the silica was removed with HF. The remaining particles were washed with water and finally dried under vacuum. The synthesized porous carbon structure has a 760m 2 / g BET surface area and 0.908cm 3 / g single point pore volume (singlepoint pore volume). The SEM pictures of the prepared porous carbon structure are as follows: figure 2 shown....

Embodiment 2

[0056] A spherical carbon structure was prepared in the same manner as in Example 1, except that 4.8 g of sodium sulfate (instead of silica particles) and 8 g of sucrose were used to prepare the spray solution, and water was used instead of HF to remove metal salts. The synthesized porous carbon structure has a 1340m 2 / g BET surface area and 2.9cm 3 / g single-point pore volume. image 3 The SEM photographs of the prepared porous carbon structures are shown in .

Embodiment 3

[0058] A 50-wt% aqueous solution of polyacrylamide (Aldrich) with a weight average molecular weight of 50g of 10,000, a 40-wt% aqueous solution of 25g glyoxal (Aldrich), 25g of Na 2 SO 4 , 10g of FeCl 3 and 40 g of distilled water were mixed with each other, and the mixture was stirred at 60° C. for 3 hours to prepare a spray solution. The solution was spray dried at 180°C to obtain 61 g of polymer complex. 10 g of the polymer complex was carbonized at 600° C., washed 3 times with distilled water, and then dried to obtain 4.3 g of a charcoal composition. The BET surface area of ​​the porous carbon structure thus prepared is 738m 2 / g, and Figure 4 The SEM photograph of the porous carbon structure is shown in .

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Abstract

Disclosed is a method for preparing a porous carbon structure, the method comprising the steps of: (a) mixing a carbon precursor, a pyrolytic template, which is pyrolyzed at the carbonization temperature of the carbon precursor or removed by post-treatment after the carbonization of the carbon precursor so as to form pores, and a solvent, to prepare a spray solution; and (b) subjecting the spray solution either to spray pyrolysis or to spray drying and then spray pyrolysis, so as to form a carbonized carbon structure, and then removing the template from the carbon structure. A mesoporous spherical carbon prepared according to the disclosed method may have a large specific surface area and a large pore volume through the control of the kind and concentration of template, and thus can be used in a wide range of applications, including catalysts, adsorbents, electrode materials, materials for separation and purification, and materials for storing hydrogen and drugs.

Description

technical field [0001] The invention relates to a method for preparing a mesoporous spherical carbon structure with large specific surface area and fine pore diameter. Background technique [0002] Nanoporous materials with large specific surface area and uniform nanopores can be used in a variety of applications, including catalysts, adsorbents, electrode materials, and materials for separation and purification [see Corma, A. Chem. Rev., 1997, 97, 2373]. A typical method for synthesizing a porous carbon material includes the following steps: (1) chemically activate the carbon, physically activate it, or a combination thereof; (2) use a metal catalyst or an organometallic catalyst to make the carbon precursor activation; (3) mixing pyrolysis polymer and carbonized polymer, and carbonizing the mixture; (4) carbonizing the synthesized airgel polymer under supercritical drying conditions. [0003] Recently, many research groups have reported methods for synthesizing carbon ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
CPCB01J21/18C04B2111/00853C01B31/00B01J35/1066B01J35/1061C04B38/0032C04B2111/0081B01J37/084B01J37/0045C04B2111/00836B01J35/1057Y10S977/896Y10S977/775C01B32/00B01J35/643B01J35/651B01J35/647C04B35/52C04B38/0054C04B38/04C01B32/05
Inventor 金相澔权元钟李贤镐陈善美金载洪孙权男石智元崔丙熹
Owner LG CHEM LTD
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