Preparation method of nano-porous carbon material

A technology of nanoporous carbon and waste liquid, which is applied in the field of preparation of nanoporous carbon materials, and can solve the problems of high preparation cost, complicated preparation methods, and the need for activators

Active Publication Date: 2019-04-09
YANKUANG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation cost of the above method is high, and the preparati

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  • Preparation method of nano-porous carbon material
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  • Preparation method of nano-porous carbon material

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preparation example Construction

[0032] The present invention provides a kind of preparation method of nanoporous carbon material, comprises the following steps:

[0033] A) mixing the alkaline waste liquid with water and freeze-drying to obtain a solid mixture;

[0034] The alkaline waste liquid is the alkaline waste liquid produced in the coal chemical deashing process;

[0035] B) subjecting the solid mixture to medium temperature treatment to obtain a pretreated product;

[0036] C) activating the pretreated product at high temperature to obtain a nanoporous carbon material.

[0037] A large amount of alkaline waste liquid will be produced in the process of chemical deashing of coal. The alkaline waste liquid contains a large amount of organic matter. As the reaction proceeds, the organic matter will continue to accumulate, which will eventually affect the reaction. Under normal circumstances, the treatment of alkaline waste liquid is difficult, and direct discharge into the sewage treatment plant will ...

Embodiment 1

[0052] (1) Mix the prepared coal powder (particle size less than 1mm) with 13wt% KOH solution, the ratio of coal powder to KOH solution is 1:3.45 (coal powder content 22.5wt%). Move the coal-alkali mixture into the autoclave. According to different coal types, adjust the temperature and pressure to appropriate values. The general temperature is 200℃~240℃, and the pressure is 40bar (4MPa). After the alkali solution is digested, the coal-alkali mixture is filtered through a vacuum filter to obtain an alkali leaching solution of the coal.

[0053] The alkali leaching solution of coal was mixed with deionized water at a ratio of 2:1. After mixing, it was ultrasonically treated for 30 minutes, and 50 mL of the mixed solution was pipetted and placed in a freeze dryer at -40°C for 48 hours at low temperature to obtain a solid mixture.

[0054] (2) Put the solid mixture obtained in step (1) into a nickel oxide crucible and put it into a high-temperature furnace. Under the protection...

Embodiment 2

[0058] Using the preparation method provided in Example 1, the difference is that: the target temperature of the activation treatment in step (3) is 600° C.; and a nanoporous carbon material is obtained.

[0059] as attached figure 2 The material shown by the scanning electron microscope also has a loose and porous nanostructure; after testing, the specific surface area of ​​the nanoporous carbon material provided by Example 2 is 1730m 2 / g; if Figure 6 As shown, using this material as an electrode material, the capacity after 1000 cycles at a current density of 0.5A / g is 297F / g, and the capacity after 1000 cycles at a current density of 1A / g is 163F / g, which has a good cycle stability.

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Abstract

The invention provides a preparation method of a nano-porous carbon material. The preparation method comprises the following steps: step (A) mixing alkaline waste liquid with water, and performing freeze-drying to obtain a solid mixture, wherein the alkaline waste liquid is produced in the chemical de-ashing process of coal; step (B) carrying out medium temperature treatment on the solid mixture to obtain a pretreated product; and step (C) carrying out high temperature activation on the pretreated product to obtain the nano-porous carbon material. According to the preparation method, the alkaline waste liquid produced in the chemical de-ashing process of coal is used as a raw material, alkali and a small amount of metal ions in the waste liquid are used as an activator and a pore-forming agent of the activation process, and finally the obtained nano-porous carbon material has a large specific surface area, can be used as an electrode material to be applied to supercapacitors and exhibits a high electrochemical energy storage performance. The experimental results show that the porous carbon material as an electrode material has the capacity of 221 F/g after circulating for 1000 times at the electric current density of 1 A/g.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, in particular to a method for preparing nanoporous carbon materials. Background technique [0002] As a new type of energy storage element, supercapacitors have the advantages of high power density, long cycle life, and wide operating temperature limit. Supercapacitors can be divided into electric double layer capacitors and pseudocapacitive capacitors according to different energy storage mechanisms. Electric double layer capacitors are widely used due to their energy saving and environmental protection characteristics. The electrode materials of electric double layer capacitors are mostly porous carbon materials. [0003] At present, coal tar, biomass, and polymers are mostly used as carbon sources for porous carbon. Among many carbon sources, coal has abundant reserves, high carbon content, and low price, and has become an important raw material for the current production of carbon...

Claims

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Application Information

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IPC IPC(8): C01B32/15
CPCC01B32/15
Inventor 刘海燕路文学韩梅左金忠邓雪翔吴永国王振华于利红王军刘峰
Owner YANKUANG GRP CO LTD
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