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Method for preparing nanometer carbon fiber by coal

A technology of carbon nanofibers and nanofibers, which is applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of high energy consumption, cumbersome operation process, and difficulty in realizing continuous production.

Inactive Publication Date: 2004-11-17
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously, on the one hand, this method is cumbersome to operate and consumes a lot of energy. The formation speed of nano-carbon materials depends on the evaporation speed of the electrode, and it is difficult to achieve continuous production. At the same time, the discharge mode is very similar to graphite rods, that is, anode carbon Evaporation of the source at high temperature in the arc is the first condition for the formation of carbon nanotubes
Most of the volatiles of coal are removed during carbonization and therefore cannot play a role in the formation of nanotubes

Method used

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  • Method for preparing nanometer carbon fiber by coal
  • Method for preparing nanometer carbon fiber by coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Use N 2 For working gas, adjust the longitudinal air flow of the DC arc generator to 4m 3 / h, the horizontal air flow is 6m 3 / h, water vapor is the accelerator. Taiji coal (less than 200 mesh) is the carbon source, and iron powder is the catalyst (2.5wt%). Turn on the power supply and apply voltage between the anode and cathode. The high-frequency power supply ignites the arc. The arc current is 250-270A, the arc voltage is 90-110V, and the water vapor flow rate is 10g / min. SEM and TEM analysis showed that a small amount of carbon nanofiber material was formed after 1 minute of reaction.

Embodiment 2

[0024] Adopt Ar, N 2 The mixed gas is the working gas, adjust the longitudinal gas Ar flow of the DC arc generator to 4m 3 / h, horizontal air N 2 Flow rate is 6m 3 / h, water vapor is the accelerator. Taiji coal (less than 200 mesh) is the carbon source and iron powder catalyst (2.5wt%). Turn on the power and apply a voltage between the anode and cathode. The high-frequency power source ignites the arc. The arc current is 280-290A, the arc voltage is 110-120V, and the water vapor flow rate is 10g / min. SEM and TEM analysis showed that a large amount of carbon nanofiber material was formed after 3 minutes of reaction.

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Abstract

The invention is a method for using coal to produce nano carbon fiber, which belongs to new material synthesis and process technology field, which is the cross field of coal chemistry, carbon material and plasma science. The character lies in: the invention uses plasma direct current arc ejection technology to process coal ash, the water-vapor is used as accelerator, the transition metal is catalyst, the invention uses the fixed bed to control the stop time of high temperature arc area of coal ash, gets large quantity of nano grade hollow fiber product, the diameter is between the nano carbon pipe and the carbon fiber generated by the gas phase. The effect of the invention is the material is cheap, the process is simple.

Description

Technical field [0001] The invention belongs to the technical field of nano materials, carbon materials, coal chemistry, and plasma science, and mainly relates to a technical method for preparing nano carbon fibers by using a plasma jet arc as an excitation heat source and coal as a carbon source. Background technique [0002] The large-scale production of nano-carbon materials and the reduction of their production costs are the basic prerequisites for their industrial applications. The use of cheap raw materials and continuous production processes are important means to reduce the production cost of nano-carbon materials. The carbon sources currently used are generally high-purity graphite rods, hydrocarbons, carbon monoxide, etc., and there are few studies on other carbon sources. In theory, all carbon-containing substances can be used as carbon sources for the preparation of nano-carbon materials. As the most abundant carbon-containing mineral resource in the world, coal can n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/12
Inventor 邱介山赵宗彬孙天军何孝军周颖王治宇
Owner DALIAN UNIV OF TECH
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