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Method for preparing spherical carbon material

A spherical and carbonized technology, applied in the field of preparation of spherical porous carbon, can solve the problem of losing spherical appearance, and achieve the effect of simple particle size control method, uniform particle size and good sphericity

Inactive Publication Date: 2012-03-21
NO 63971 TROOPS PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since polyvinylidene fluoride melts at 154-184°C and loses its original spherical appearance, what is obtained in the above-mentioned patent is an amorphous powdery carbon material

Method used

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  • Method for preparing spherical carbon material
  • Method for preparing spherical carbon material
  • Method for preparing spherical carbon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 5g of commercially available PVDF white powder (particle size: 500nm) and 35g of flaky KOH solid, mix them, grind them into a uniform fine powder, put them in an oven at 120°C for 10 hours, take them out, and wash them with dilute hydrochloric acid and deionized water in sequence until Neutral, the product dries and turns brown. The product was placed in a tube furnace, and under the protection of 200mL / min high-purity nitrogen, the temperature was raised to 150°C at 10°C / min, then to 700°C at 5°C / min, and the temperature was kept constant for 2h. After the furnace temperature was cooled to room temperature, it was taken out to obtain a black powder. SEM ( figure 1 ) observed as a spherical carbon material with a particle size of about 500nm and a specific surface area of ​​550m 2 / g.

Embodiment 2

[0034]Dissolve 25g of KOH in 70mL of deionized water, add 5g of PVDF white powder (particle size 170nm), stir magnetically for 90min, then heat in an oven at 120°C for 20h, take it out and wash it with dilute hydrochloric acid and deionized water until neutral. The product dried and was dark brown. The product was placed in the center of a tube-type resistance furnace, and under the protection of high-purity argon, the temperature was raised to 600°C at a constant temperature for 2 hours, and then the temperature was raised to 850°C at 10°C / min, and 100mL / min CO was introduced. 2 Gas for 5 hours, after the furnace temperature is cooled to room temperature, take it out to obtain a black product, which is spherical in shape under the scanning electron microscope, with a particle size of about 170nm and a specific surface area of ​​1130m 2 / g. The scanning electron micrographs of PVDF white powder and obtained spherical carbon are shown in figure 2 (A) and (B).

Embodiment 3

[0036] Measure 60 mL of absolute ethanol in a beaker, and measure 40 mL of N,N-dimethylformamide (DMF) into the absolute ethanol. Measure about 18mL of DBU into the above solution, stir well until the solution becomes clear and uniform, weigh 5g of PVDF white powder (particle size 170nm) and gradually add it to the above mixed solution, stir to dissolve it. Place in an oven at 70°C for 18h. Take it out, wash it with methanol until the filtrate is colorless, and dry it at 110°C to obtain a brown powder. Place it in the center of a tube furnace, under the protection of 200mL / min high-purity nitrogen, raise it to 700°C at 5°C / min, and carbonize at a constant temperature for 2h to obtain a black carbonized product. Mix the carbonized material and KOH at a mass ratio of 1:3, place it in the center of a tube furnace, and under the protection of 250mL / min high-purity nitrogen, raise it to 780°C at a rate of 5°C / min, activate it at a constant temperature for 5 hours, and wait for the...

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Abstract

The invention relates to a method for preparing spherical porous carbon, wherein the spherical porous carbon is obtained through the following steps of taking commercialized spherical polyvinylidene fluoride (PVDF) resin as a raw material, carrying out defluorination stabilization at a low temperature below 150 DEG C, carrying out carbonization at high temperature, and activating. The commercial production of the spherical PVDF resin is realized, the particle diameter of the spherical PVDF resin is controllable, and the method for preparing the spherical porous carbon has the advantages that the method is simple, the degree of sphericity of a carbon sphere is good, the particle diameter is uniform, the size of the particle diameter is easy to regulate and control, and the like. The particle diameter of the spherical porous carbon is adjustable between 5 nm and 50 microns, the specific surface area is 50-3000 m<2> / g, and thus, the spherical porous carbon can be used for an electrode material of a super capacitor, an electrode material of a lithium ion battery, an electrode material of a capacitance-method desalination equipment, blood purification, a catalyst carrier, water treatment, gas purification, solvent recovery and the like.

Description

technical field [0001] The invention relates to a preparation method and application of a carbon material, in particular to a preparation method and application of a spherical porous carbon. technical background [0002] Activated carbon has the characteristics of developed pores, high specific surface area, high pore volume, and pore size can be adjusted within a certain range. As an adsorption material, it has been widely used in water purification, gas separation, solvent recovery, decolorization and other fields. It can also be used as a catalyst Carriers and lithium-ion batteries, electrode materials for supercapacitors, etc. According to the different shapes, activated carbon can be divided into powdery activated carbon, activated carbon granules, columnar activated carbon, activated carbon fibrous, spherical activated carbon, honeycomb activated carbon and so on. Spherical carbon materials have good spherical appearance and high packing density, and have unique appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 徐斌岳淑芳曹高萍张浩杨裕生
Owner NO 63971 TROOPS PLA
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