Active carbon preparation method based on catkin

A kind of activated carbon preparation and activated carbon technology, which is applied in the field of catkin-based activated carbon preparation, can solve the problems of small specific surface area, lack of artificial regulation of target material pore structure, etc., and achieve large specific surface area, high rate performance and good capacitance characteristics.

Active Publication Date: 2015-05-20
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this direct carbonization method only utilizes the original pore structure and surface chemical properties of catkins, lacks the artificial control of the target material pore structure, and has a small specific surface area of ​​only 257 m 2 / g

Method used

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  • Active carbon preparation method based on catkin
  • Active carbon preparation method based on catkin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Disperse 10 g of catkins in 300 ml of anhydrous ethanol solution by ultrasound, and then filter to obtain pure catkins; place the wet catkins in a carbonization furnace in turn, under an argon atmosphere, at 400 o Under the temperature of C, carbonize for 3 h to obtain carbonized material; then the carbonized catkins and potassium hydroxide are dispersed in 50 wt% ethanol aqueous solution according to the mass ratio of 1:1, then dried, and then placed in the activation furnace , under nitrogen atmosphere, at 800 o C for 20 min at a constant temperature, naturally cooled to room temperature to obtain an activated carbon sample; finally, the activated activated carbon sample was acid-washed and washed in turn until the filtrate was clear and the pH reached 7; o C drying treatment, the preparation specific surface area is 1020 m 2 / g, activated carbon with a nitrogen content of 3.12wt%.

[0023] Add the prepared activated carbon, acetylene black, and polytetrafluoroethyl...

Embodiment 2

[0025] Disperse 10 g of catkins in 600 ml of anhydrous ethanol solution by ultrasound, and then filter to obtain pure catkins; put the wet catkins in a carbonization furnace in turn, under nitrogen atmosphere, at 500 o C, carbonized for 1.5 h to obtain carbonized material; then the carbonized catkins and potassium hydroxide were dispersed in 50 wt% ethanol aqueous solution at a mass ratio of 1:3, dried, and then placed in an activation furnace , under nitrogen atmosphere, at 600 o C for 50 min at a constant temperature, and naturally cooled to room temperature to obtain an activated carbon sample; finally, the activated activated carbon sample was washed with acid and water in sequence until the filtrate was clear and the pH reached 7; o C drying treatment, the preparation specific surface area is 1340m 2 / g, activated carbon with a nitrogen content of 4.92wt%.

[0026] The method for preparing the electrode is the same as that in Example 1. After testing, when the current d...

Embodiment 3

[0028] Disperse 10 g of catkins in 900 ml of anhydrous ethanol solution by ultrasound, and then filter to obtain pure catkins; place the wet catkins in a carbonization furnace in turn, under an argon atmosphere, at 1000 o Under the temperature of C, carbonize for 1 h to obtain carbonized material; then the carbonized catkins and potassium hydroxide are dispersed in 50 wt% ethanol aqueous solution according to the mass ratio of 1:4, and then dried, and then placed in the activation furnace , under argon atmosphere, at 600 o C for 70 min at a constant temperature, naturally cooled to room temperature to obtain activated carbon samples; finally, the activated activated carbon samples were washed with acid and water in sequence until the filtrate was clear and the pH reached 7; o C drying treatment, the preparation specific surface area is 1540 m 2 / g, activated carbon with a nitrogen content of 2.56 wt%.

[0029] The method for preparing the electrode is the same as that in Exa...

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Abstract

The invention discloses an active carbon preparation method based on catkin. The preparation method comprises the following steps: ultrasonically dispersing the catkin in absolute ethyl alcohol according to the condition that the ratio of the catkin to the absolute ethyl alcohol is 10g:(300-900ml), and filtering to obtain pure catkin; carbonizing and activating under inert atmosphere, orderly acid-pickling and washing an activated active carbon sample until the filtrate is clear and the pH achieves 7; drying at 90-120 DEG.C to prepare the active carbon. The natural catkin is used for preparing the nitrogen-doped active carbon with developed ducts and high specific surface area, the environment problem is solved, and the great economic benefit is produced.

Description

technical field [0001] The invention belongs to a method for preparing activated carbon, in particular to a method for preparing activated carbon based on catkins. Background technique [0002] Activated carbon has become the most commercially competitive electrode material for supercapacitors due to its good electrical properties, abundant resources, diverse structures, and affordable price. Activated carbon is generally prepared from carbon-containing precursors through high-temperature carbonization and activation. At present, the precursors for preparing activated carbon mainly include coal, petroleum, wood, polymer and biomass materials. Among them, biomass has attracted more and more attention from scientific researchers because of its wide source, renewable nature, exquisite inner and outer surfaces and highly regular geometric structure. [0003] Catkins are a kind of natural product in northern China. When spring and summer alternate, catkins flying everywhere hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12B09B3/00
Inventor 陈成猛谢莉婧孔庆强苏方远李晓明刘卓张长明蔡榕
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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