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A kind of preparation method of pitch-based activated carbon

An activated carbon and pitch-based technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems affecting the application range, high micropore content, low mesopore content, etc., and achieve excellent electrochemical performance and surface utilization The effect of high rate and high mesopore content

Active Publication Date: 2016-05-18
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional preparation of activated carbon is made from the husks of plant fruits, etc. Due to the limitation of such resources, the raw materials for activated carbon production are relatively scarce, resulting in relatively expensive prices for activated carbon and affecting the scope of application.
At present, the effective method for the preparation of pitch-based activated carbon is to chemically activate KOH as an activator, and activated carbon with a higher specific surface area has been prepared, but due to the high content of micropores and low content of mesopores, the electrolyte solution itself has a certain size, and a large amount of The micropores cannot absorb electrolyte ions, resulting in a small effective specific surface area, and the micropores cannot provide fast electrochemical adsorption, resulting in low specific power
At present, there are also some patents for mesoporous preparation by the template method. Although the pore size of activated carbon prepared by the template method is mostly mesoporous, the operation of this method is relatively complicated, the process requirements are high, and it is easy to cause the pore size to be too large to be mass-produced.
If the pore size is too large, the adsorption force on the carbon surface will decrease, and the effectiveness of adsorbing electrolyte ions to form an electric double layer will decrease. At the same time, the surface area will decrease, resulting in a decrease in specific capacity.
The above shortcomings limit the commercialization of high-performance activated carbon electrodes

Method used

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  • A kind of preparation method of pitch-based activated carbon
  • A kind of preparation method of pitch-based activated carbon
  • A kind of preparation method of pitch-based activated carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The coal tar pitch is crushed and pulverized, and the powder with a particle size of 100-150 mesh is selected as the raw material. The powder is put into a coking furnace for coking at 1.5°C / min and 480°C, and the coking time is controlled at 9 hours to obtain green coke. Crush raw coke, screen powder with a particle size of 100-200 mesh as raw material, mix KOH and powdered green coke according to the ratio of mass ratio KOH: raw coke = 4:1, and put the mixture into the activation furnace, under the protection of nitrogen The temperature was raised to 700°C at a rate of 5°C / min, and activated by heat preservation for 2 hours. The product was washed with deionized water and dilute hydrochloric acid until neutral, dehydrated, dried, and pulverized to obtain activated carbon.

[0029] as table 1 and figure 1 SEM image of activated carbon. Total pore volume (V t ) is 1.18mL / g, in which the micropore volume (V micro ) is 0.73mL / g, the ratio of micropore volume to total p...

Embodiment 2

[0034] The coal tar pitch is crushed and pulverized, and the powder with a particle size of 90-120 mesh is selected as the raw material. The powder is put into a coking furnace for coking at 1.5°C / min and 460°C, and the coking time is controlled at 9 hours to obtain green coke. Crush raw coke, screen powder with a particle size of 100-200 mesh as raw material, mix KOH and powdered green coke according to the ratio of mass ratio KOH: raw coke = 4:1, and put the mixture into the activation furnace, under the protection of nitrogen The temperature was raised to 800°C at a rate of 5°C / min, and activated by heat preservation for 2 hours. The product was washed with deionized water and dilute hydrochloric acid until neutral, dehydrated, dried, and pulverized to obtain activated carbon. as table 2 and image 3 SEM image of activated carbon, total pore volume (V t ) is 1.42mL / g, in which the micropore volume (V micro ) is 0.79mL / g, the ratio of micropore volume to total pore volume ...

Embodiment 3

[0040] The coal tar pitch is crushed and pulverized, and the powder with a particle size of 90-120 mesh is selected as the raw material. The powder is put into a coking furnace for coking at 0.5°C / min and 440°C, and the coking time is controlled at 7 hours to obtain green coke. Grind raw coke, screen powder with a particle size of 100-200 mesh as raw material, mix KOH and powdered raw coke according to the ratio of mass ratio KOH: raw coke = 2:1, put the mixture into the activation furnace, and protect it under nitrogen The temperature was raised to 900°C at a rate of 1°C / min, and activated by heat preservation for 2 hours. The product was washed with deionized water and dilute hydrochloric acid until neutral, dehydrated, dried, and pulverized to obtain activated carbon.

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Abstract

The invention provides a preparation method of asphalt-based active carbon. The preparation method comprises the following steps: crushing asphalt to obtain a powder body; coking the obtained powder body to form green coke; crushing the green coke to prepare a green coke powder body; mixing the green coke powder body with potassium hydroxide, and crushing to obtain mixed powder; placing the obtained mixed powder body in an activating furnace to prepare an activator, cooling the activator, cleaning by using water and acid until reaching neutral, drying and crushing to obtain the active carbon. The preparation method is simple to operate and easy to control; the prepared active carbon is high in mesopore content, high in effective surface utilization rate, and excellent in electrochemical performance.

Description

technical field [0001] The invention relates to the field of activated carbon preparation, in particular to a preparation method of pitch-based activated carbon. Background technique [0002] As a new type of energy storage element, supercapacitors have a very wide range of applications and a huge potential market, and have attracted the attention of governments and enterprises in various countries. Supercapacitors not only have the high specific power and high cycle characteristics of ordinary capacitors, but also have the energy storage characteristics of batteries. Therefore, they can meet the requirements of high specific power and high specific energy. Because it has the advantages of high temperature resistance, semi-permanent charge and discharge cycle performance and maintenance-free compared to batteries, it has been widely used in IC integrated circuits, VLSI, computer storage backup power supplies and other high-load backup power supplies. High specific power sup...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/12C01B32/348
Inventor 任相坤王培崔永君洪东升刘冬冬
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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