Device and method for preparing activated carbon material for electrochemical capacitor

An activated carbon and capacitor technology, which is applied in the field of devices for preparing activated carbon materials for electrochemical capacitors, can solve the problems of unstable microwave activation process, increase the cost of activated carbon products, secondary pollution of waste water, etc. The effect of speeding up the reaction

Inactive Publication Date: 2011-10-05
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the conventional activation method takes a long time, consumes a lot of energy, and consumes a lot of alkali
In addition, after activation, the product needs to be pickled and washed with water, and more residual alkali will cause secondary pollution such as waste water
Patent CN201010177879.9 discloses a microwave composite activation method for preparing super porous carbon. The preparation method uses catalyst iron powder and cobalt powder, etc., and micro-explosive reactions occur, which makes the microwave activation process unstable and increases the cost of activated carbon products. cost

Method used

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  • Device and method for preparing activated carbon material for electrochemical capacitor
  • Device and method for preparing activated carbon material for electrochemical capacitor
  • Device and method for preparing activated carbon material for electrochemical capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: Taking bituminous coal as raw material, the specific preparation process is as follows:

[0023] (1) Add 500mL of hydrochloric acid (6M) to 100g of 180 mesh bituminous coal, then add 2mL of absolute ethanol, stir and ultrasonically vibrate the mixture for 30min; heat the mixture in a constant temperature water bath at 55-60°C for 1h, wash with hot distilled water until neutral , and dried under vacuum at 110°C for 2h. Divide the above coal sample into two parts and place them in plastic beakers, add 400mL of 40% hydrofluoric acid and 2mL of absolute ethanol, stir and ultrasonically vibrate the mixture for 30min; heat in a constant temperature water bath at 55-60°C for 1h, Wash with hot distilled water until neutral, and dry in vacuum at 110°C for 2 hours. Divide the above coal sample into two parts and place them in a glass beaker, add 500mL of 2M nitric acid, then add 2mL of absolute ethanol, stir and ultrasonically vibrate the mixture for 30min; Neutra...

Embodiment 2

[0026] Embodiment 2: Taking bituminous coal as raw material, the specific preparation process is as follows:

[0027] (1) Raw coal and the processing method of raw coal are the same as (1) in embodiment 1, and the ash content of coal is less than 0.2%.

[0028] (2) Dissolve 12g of deashed coal and 24g of potassium hydroxide obtained in step (1) in 30mL of deionized water, stir rapidly with a glass rod and place in water to cool until returning to normal temperature; then add 5mL of absolute ethanol, and use Stir with a glass rod; heat and stir the mixture on a magnetic heating stirrer until a paste is formed; transfer the paste to a ceramic mortar, dry it under vacuum at 110°C for 1 h, and transfer the mixture to corundum in the crucible. The corundum crucible was placed in the quartz protective cover in the microwave chemical reactor, and activated carbon was prepared by microwave-assisted heating and activation under the condition of 700W and 20min; it was naturally cooled ...

Embodiment 3

[0030] Embodiment 3: using bituminous coal as raw material, the specific preparation process is as follows:

[0031] (1) Raw coal and the processing method of raw coal are the same as (1) in embodiment 1, and the ash content of coal is less than 0.2%.

[0032] (2) Dissolve 12 g of deashed coal and 36 g of potassium hydroxide obtained in step (1) into 30 mL of deionized water, stir rapidly with a glass rod and place in water to cool until returning to normal temperature; then add 5 mL of dehydrated ethanol, and use Stir with a glass rod; heat and stir the mixture on a magnetic heating stirrer until a paste is formed; transfer the paste to a ceramic mortar, dry it under vacuum at 110°C for 1 h, and transfer the mixture to corundum in the crucible. The corundum crucible was placed in the quartz protective cover in the microwave chemical reactor, and activated carbon was prepared by microwave-assisted heating and activation under the condition of 700W and 20min; it was naturally ...

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Abstract

The invention provides a device and method for preparing an activated carbon material for an electrochemical capacitor, belonging to the technical fields of coal chemical industry and microwave chemistry. The method comprises the following preparation processes of: deashing coal particles serving as raw materials by using hydrochloric acid and hydrofluoric acid, modifying the deashed coal by using nitric acid in an auxiliary way, mixing the modified coal serving as a carbon source with potassium hydroxide and deionized water, stirring to obtain a mixture, stirring and evaporating the mixture to obtain a solid mixture, and then performing microwave-assisted activating, washing, drying and grinding on the solid mixture to obtain the activated carbon. The invention has the advantages that the activation time is only 20-30 minutes, the mass ratio of potassium hydroxide to coal is (0.5-3):1, the preparation process is simple, the microwave-assisted heating is uniform, efficient and energy-saving, the consumption of the potassium hydroxide is reduced, and the activation process has the advantages of uniformity and high efficiency. The prepared activated carbon is used as an electrode material of the electrochemical capacitor and has better stability and excellent comprehensive property.

Description

Technical field: [0001] The invention belongs to the technical field of coal chemical industry and microwave chemistry, and in particular relates to a device and method for preparing activated carbon materials for electrochemical capacitors. Background technique: [0002] Activated carbon has a well-developed pore structure and special surface chemical properties, and has a wide range of applications in metallurgy, chemical industry, electronics, energy and environmental protection. The raw materials for producing activated carbon mainly include coal, wood and other carbon-containing raw materials. Among them, woody raw materials are mainly wood and various fruit shells. Wood comes at the expense of deforestation, while husks have limited sources. my country is rich in coal resources, accounting for about 75% of primary energy. Among them, gas coal is favored by people because its price is lower than that of coking coal. [0003] Activated carbon activation methods are m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12H01G9/042
CPCY02E60/13
Inventor 何孝军郑明东王婷李如春
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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