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Process for preparing nanometer carbon microballoon by arc discharging technology

A carbon nanosphere and arc discharge technology, which is applied in the fields of coal chemical industry and carbon materials, can solve the problems of excessive by-products and poor mechanical structure, and achieve the effect of abundant resources, few structural defects and convenient operation

Inactive Publication Date: 2004-08-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the shortcomings of excessive by-products and poor mechanical structure in the preparation of related carbon nanomaterials by arc method

Method used

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  • Process for preparing nanometer carbon microballoon by arc discharging technology
  • Process for preparing nanometer carbon microballoon by arc discharging technology
  • Process for preparing nanometer carbon microballoon by arc discharging technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A graphite rod (9mm in diameter) is used as the arc anode, and then the anode graphite rod is placed in the arc device for arc discharge evaporation and gasification. The reactor was first purged three times with nitrogen and then once with helium to remove the air in the reactor. Finally, a mixture of helium and acetylene (the volume ratio of acetylene to helium is 5:1) is introduced to a pressure of 0.065MPa (absolute pressure), cooling water is passed, the power is turned on, and the distance between the electrodes is adjusted to maintain the electrode The spacing is 2-3mm, so that the arc is in a "stable" discharge state until no substance is generated on the anode. The entire discharge time lasts about 10 minutes; after the discharge is over, turn off the power and stop the cooling water. Opening the reactor revealed a large amount of fibrous material deposited at the end of the anode. The collected products were weighed and the yield was calculated. Under the ab...

Embodiment 2

[0029] Coal-based carbon rods were used as the anode to prepare carbon nanospheres, and the selected coal was anthracite. The basic analysis data are as follows: M ad = 2.34%, A d = 3.13%, V daf = 15.70%; C daf =87.21%, H daf =3.53%, N daf= 1.06%. Take 500g of raw coal sample, pulverize it in a pulverizer, and sieve it until the particle size is less than 150μm, and dry it for later use. Take 200g of the above-mentioned dry coal sample and mix it with 100g of coal tar, put it into a mixer and stir evenly to obtain a mixture with certain cohesiveness, then put this mixture into a mold and extrude it with a hydraulic press to prepare a coal rod. The molding pressure is at About 10 atmospheres, the molding speed is 0.5cm / s, and the diameter of the obtained coal rod is 10mm. Cut off the above-mentioned coal rods to make short rods with uniform length (10cm) and put them into an electric furnace for programmed temperature rise carbonization. The whole carbonization process is...

Embodiment 3

[0031] When preparing carbon nanospheres with a certain hollowness, metal catalysts need to be added. The basic process is as follows: take a coal-based carbon rod as the anode, take 500 g of the raw coal sample (analysis of the sample is the same as in Example 2), pulverize in a pulverizer, and sieve to a particle size of less than 150 μm, and dry it for later use. Take 200g of the above-mentioned dry coal sample and mix it with 100g of coal tar, put it into a mixer and stir evenly to obtain a mixture with certain cohesiveness, then put this mixture into a mold and extrude it with a hydraulic press to prepare a coal rod. The molding pressure is at About 15 atmospheres, molding speed 0.5cm / s, the outer diameter of the obtained coal rod is 10mm, the inner diameter is the hollow coal rod of 6mm, then above-mentioned hollow coal rod is carbonized, and the carbonization process is exactly the same as the process of embodiment 1. The process of adding the catalyst is first to mix t...

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Abstract

The method for preparing carbon nanosphere by using coal base carbon rod or graphitic rod as electrode and adopting plasmka arc discharge technology under the condition of helium gas / acetylene gas atmosphere is characterized by that said method includes the following steps: making raw material coal undergo the process of pretreatment to obtain carbon rod which is uniform in size and quality and has proper electric conductivity; using said carbon rod or graphite rod as anode and placing it into DC arc plasma equipment to make discharge evaporation under the condition of helium gas / acetylene gas atmosphere, after discharge, collecting black beard-like material grown out on the top of anode in the reaction process so as to obtain the invented carbon nanosphere. Said invention also provides its application range.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry and carbon materials, and relates to a method for preparing carbon nanospheres (Carbon nanosphere) by means of arc discharge. Background technique [0002] For using coal-based carbon rods or graphite as the anode to prepare carbon nanospheres under the atmosphere of acetylene / helium by arc discharge method, there is no corresponding report at home and abroad, and the research background related to the present invention is described below. . [0003] Scientists consciously and systematically take nanoparticles as research objects to explore nanosystems as early as the 1960s, and then the acquisition of some metal ultrafine particles and the discovery of semiconductor quantum wells and superlattices made nanoscience develop rapidly and become the most One of the scientific fields of heat. Carbon nanoscience research began with the discovery of fullerene in 1985, and has been contin...

Claims

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Application Information

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IPC IPC(8): B01J19/08C01B31/02
Inventor 邱介山李永峰王云鹏
Owner DALIAN UNIV OF TECH
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