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Method for preparing composite carbon material with high specific surface area

A high specific surface area, composite carbon technology, which is applied in the field of carbon material preparation, can solve the problem of inability to prevent pyrolysis carbon from plugging pores, achieve high specific surface area, improve comprehensive performance, and avoid the effect of depositing plugging pores.

Inactive Publication Date: 2011-08-10
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It only avoids the growth and plugging of CNF pores caused by the catalyst entering the pores of activated carbon, but it cannot prevent the plugging of pyrolytic carbon caused by the adsorption of activated carbon pores on carbon source gas.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: At 30°C, immerse 10 g in a saturated aqueous solution of calcium nitrate pore protecting agent twice the volume of activated carbon with a specific surface area of ​​2743m 2 / g of coal-based activated carbon was impregnated under reduced pressure with a vacuum pump for 15 minutes in a closed container, filtered and dried after cooling down to room temperature, and the material was treated under nitrogen protection at 400°C for 1 hour, and the above operation was repeated twice to obtain the pore-protected Activated carbon (specific surface area 783m 2 / g). The activated carbon material is impregnated with ethanol solution of nickel acetate at room temperature, filtered, and dried, and then the material is used in a high-temperature furnace with nitrogen as a protective gas. The heating rate is 3°C / min. , to obtain activated carbon with a loading ratio of 0.5% by mass nickel catalyst. Put the catalyst-loaded activated carbon material into a vertical carboniz...

Embodiment 2

[0021] Example 2: At 70°C, 10 g of aluminum nitrate pore protector saturated aqueous solution with a specific surface area of ​​2340 m is immersed in an amount 5 times the volume of activated carbon. 2 / g of petroleum coke-based activated carbon was impregnated under reduced pressure with a vacuum pump for 60 minutes in a closed container, filtered and dried after cooling down to room temperature, and the material was treated at 500°C under nitrogen protection for 3 hours. Activated carbon (specific surface area 632m 2 / g). Then the activated carbon material is impregnated in an aqueous solution of ferric nitrate at room temperature, filtered, and dried, and then the material is used in a high-temperature furnace with nitrogen as a protective gas, and the heating rate is 2°C / min. After reducing for 120min, an activated carbon with a loading capacity of 15% by mass iron catalyst was obtained. Put the catalyst-loaded activated carbon material into a vertical carbonization acti...

Embodiment 3

[0022] Example 3: At 50°C, immerse 10 g in saturated aqueous solution of magnesium nitrate and calcium nitrate pore protector with 3 times the volume of activated carbon, the specific surface area is 1840m 2 / g of petroleum coke-based activated carbon, impregnated under reduced pressure with a vacuum pump for 30 minutes in a closed container, filtered and dried after cooling down to room temperature, and treated the material at 600°C for 2 hours under nitrogen protection. Repeat above-mentioned operation 2 times, obtain the activated carbon (specific surface area 478m 2 / g). Then the activated carbon material is impregnated in an aqueous solution of cobalt nitrate at room temperature, filtered, and dried, and then the material is placed in a high-temperature furnace with nitrogen as a protective gas at a heating rate of 0.5°C / min. After reducing for 120min, an activated carbon with a loading capacity of 5% cobalt catalyst was obtained. Put the catalyst-loaded activated carbo...

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Abstract

The invention relates to a method for preparing a composite carbon material with a high specific surface area, which comprises the following steps of: after active carbon is impregnated into saturated aqueous solution of soluble metal salt, carrying out decompression and impregnation for 15 to 60 minutes in a sealed container; filtering and drying the obtained solution; processing the obtained product for 1 to 3 hours under the protection of nitrogen at a temperature of 400 to 600 DEG C and repeating the operation for 2 to 5 times to obtain an active carbon hole blocking material; carrying out impregnation coating of metal salt on the active carbon hole blocking material by solution of VIIIB metal salt; filtering and drying to obtain active carbon coated with a metal catalyst; carrying out vapor phase deposition on the active carbon coated with the metal catalyst to obtain a discharge material; immersing the discharge material in hydrochloric acid solution to remove the catalyst and a hole protective agent in a reaction product; in case of necessity, carrying out stirring or ultrasonic processing; filtering; washing the product into neutrality by de-ionized water; and drying to obtain the composite carbon material. The composite carbon material has the advantages of high specific surface area and high electrical conductivity.

Description

technical field [0001] The invention belongs to a method for preparing a carbon material, in particular to a method for preparing a composite carbon material with a high specific surface area. technical background [0002] Activated carbon has the characteristics of wide sources, cheap and easy to obtain, good chemical stability, rich pore structure, and large specific surface area. It is an excellent carbon functional material. There are a wide range of applications. However, activated carbon has the disadvantages of poor electrical and thermal conductivity, which limits its performance as an electrode material and a gas storage medium. Carbon nanotubes and carbon nanofibers have extremely high electrical and thermal conductivity, but due to their small specific surface area and high cost, they are not conducive to popularization and application. [0003] Because the performance characteristics of activated carbon (AC) and carbon nanofiber (CNF) or carbon nanotube (CNT) a...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 李开喜谷建宇
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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