A method for increasing the porosity of low-quality activated carbon

A kind of activated carbon, low-quality technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems that are difficult to meet the application requirements of supercapacitors, high micropore content, low porosity, etc., and meet industrial mass production Requirements, simple operation, and the effect of improving porosity

Active Publication Date: 2021-06-29
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the defects that carbon materials prepared by physical activation methods in the prior art are difficult to meet the application requirements of supercapacitors due to low porosity, high micropore content, and low quality, the purpose of the present invention is to provide a carbon material that utilizes low porosity and micropore ratio. High-quality low-quality activated carbon is a method of obtaining high-quality activated carbon with high porosity and high mesopore and macropore ratio through pore expansion. The low-quality activated carbon treated by this method can be applied to supercapacitors, which greatly reduces the production cost of supercapacitors , improves the supercapacitor capacity, as in Et 4 NBF 4 In the / AN system, the energy density can reach 21.67Wh / kg, and the voltage window is 2.7V, which has high application value

Method used

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  • A method for increasing the porosity of low-quality activated carbon
  • A method for increasing the porosity of low-quality activated carbon
  • A method for increasing the porosity of low-quality activated carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1. The process of carbon dioxide activation to prepare activated carbon is as follows:

[0048] Coconut shells were selected as the carbon source of the precursor, peeled, and the main part was taken, washed several times with distilled water, dried in an oven at 120°C for 24 hours, and then crushed by a pulverizer (6000r / min, 30min). Pulverize and sieve out 325 mesh coconut shell powder. Put the carbon source in a tube furnace, raise the temperature to 900°C at 10°C / min in an argon atmosphere, perform high-temperature activation treatment in a 1L / min carbon dioxide atmosphere for 2 hours, and then lower the temperature in an argon atmosphere. The product was washed three times with 1 mol / L HCl and twice with water until neutral, then filtered and dried in vacuum at 120°C for 12 hours.

[0049] 2. The alkane pore expansion process is as follows:

[0050] Using coconut shell activated carbon as raw material, in the atmosphere of the mixed gas of butane and argon (volum...

Embodiment 2

[0070] The process of carbon dioxide activation to prepare activated carbon is as in Example 1.

[0071] Coconut shell activated carbon was used as raw material, and the temperature was raised to 500°C for 1h at a heating rate of 5°C / min in an atmosphere of a mixture of pentane and argon (1:8). After the calcination, the coconut shell activated carbon after the pore size adjustment was completed was soaked in 1mol / L hydrochloric acid solution for 12 hours to remove inorganic impurities. Rinse with deionized water until neutral, collect the black solid by filtration, dry in a vacuum oven at 80° C. to obtain the coconut shell activated carbon with regulated pore size.

[0072] The process of reducing activated carbon with argon and hydrogen mixed gas is as in Example 1, and the BET test spectrum of the final obtained activated carbon is as follows image 3 As shown, the PSD test pattern is as Figure 4 shown.

[0073] Conclusion: The BET test pattern and PSD test pattern of a...

Embodiment 3

[0075] The process of carbon dioxide activation to prepare activated carbon is as in Example 1.

[0076] Using coconut shell activated carbon as raw material, in the atmosphere of the mixed gas of hexane and argon (1:8), the temperature was raised to 500°C at a heating rate of 5°C / min and kept for 1h. After the calcination, the coconut shell activated carbon after the pore size adjustment was completed was soaked in 1mol / L hydrochloric acid solution for 12 hours to remove inorganic impurities. Rinse with deionized water until neutral, collect the black solid by filtration, dry in a vacuum oven at 80° C. to obtain the coconut shell activated carbon with regulated pore size.

[0077] The process of reducing activated carbon with argon-hydrogen mixed gas is as in Example 1.

[0078] The obtained low-cost high-quality activated carbon, conductive carbon black and binder are added to an appropriate amount of NMP in a mass ratio of 70:15:15, mixed and ground to obtain a uniform ele...

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Abstract

The invention discloses a method for increasing the porosity of low-quality activated carbon. The method is to first place the low-quality activated carbon in a short-chain alkane atmosphere for pyrolysis, and then place it in a reducing atmosphere for reduction. This method uses low-quality activated carbon with low porosity and high proportion of micropores to obtain high-quality activated carbon with high porosity and high proportion of mesopores and macropores through pore expansion. The low-quality activated carbon treated by this method can be used in supercapacitors. Significantly reduces the production cost of supercapacitors, and improves the capacity of supercapacitors, such as in Et 4 NBF 4 In the / AN system, the energy density can reach 21.67Wh / kg, and the voltage window is 2.7V, which has high application value.

Description

technical field [0001] The invention relates to a method for modifying activated carbon, in particular to a low-quality activated carbon obtained by pyrolysis and physical activation of biomass raw materials such as coconut shells with low porosity and high micropore content to obtain high porosity and high porosity through gas phase regulation. The method for the carbon material with mesopore and macropore ratio belongs to the technical field of high-quality carbon material preparation. Background technique [0002] In 2012, the size of China's supercapacitor market was only 1.63 billion yuan, and in 2015, the size of China's supercapacitor market increased to 6.65 billion yuan. By 2016, China's supercapacitor market reached 8.18 billion yuan. As of 2018, the scale of China's supercapacitor market exceeded 12 billion yuan. In 2019, China's supercapacitor market will reach a new peak. Supercapacitors are essential energy storage devices for human life. Carbon materials a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/36
CPCC01B32/36
Inventor 纪效波蔡鹏邹国强侯红帅
Owner CENT SOUTH UNIV
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