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Carbon nanometer tube arc discharge preparation method under vacuum condition

A technology of arc discharge and carbon nanotubes, which is applied in petrochemical, carbon materials, and coal chemical industries. It can solve the problems of high cost of CNT, low degree of graphitization of CNT, and difficulty in large-scale production of CNT, and achieve mechanical and electronic properties. Good, less structural defects, lower production cost

Inactive Publication Date: 2004-11-10
DALIAN UNIV OF TECH
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Problems solved by technology

Compared with the arc method, the process of the CVD method is relatively simple, and carbon nanotube array products can be obtained, but the degree of graphitization of the obtained CNT is low, and the mechanical properties of the carbon tube are poor.
The CNTs prepared by laser evaporation are relatively pure and have a high degree of graphitization, but expensive instruments and equipment are required, which leads to high costs of CNTs and makes it difficult to achieve large-scale production of CNTs.
[0005] In summary, from the perspective of cost and the quality of CNT products, the existing technology for preparing carbon nanotubes cannot achieve low-cost and high-yield preparation of CNTs with high purity and good physical properties.

Method used

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  • Carbon nanometer tube arc discharge preparation method under vacuum condition
  • Carbon nanometer tube arc discharge preparation method under vacuum condition

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Embodiment 1

[0022] SWCNTs were prepared from coal by vacuum arc evaporation. First prepare the composite coal-based carbon rod mixed with the catalyst, the basic properties of the coal used 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 the 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 dry coal sample and mix it with 100g of coal tar and 5g of iron powder (the purity of the iron powder is 99.9%, and the particle size is less than 200μm) and put it into the mixer and stir evenly to obtain a viscous mixture, and then put this mixture into The mold is extruded into coal rods with a hydraulic press. The forming pressure is 10 MPa, the forming speed is 0.5 cm / s, and a coal rod with a diameter of 10 mm is obtained. The above-mentioned coal rods were cut off to make short rods with a length of 10 cm, and then put into...

Embodiment 2

[0025] MWCNTs were prepared from coal under vacuum discharge conditions. Get coal sample 200g (the analysis data of coal is the same as embodiment 1), pulverize and sieve to particle size and be less than 150 μ m, fully mix with coal tar; This mixture is compacted, carbonized, and preparation process is identical with embodiment 1. Put the prepared carbon rod into the arc device for arc discharge evaporation and gasification. Vacuumize, pass the cooling water, turn on the power, adjust the distance between the electrodes to stabilize the arc, and the entire discharge time lasts about 25 minutes; after the discharge is over, turn off the power and stop the cooling water. Opening the reactor revealed pencil-shaped MWCNTs growing from the cathode end of the reactor. The collected products were weighed and the yield was calculated. Under the above conditions, the yield of carbon nanotubes was 7g / h. The obtained carbon nanotube products were characterized and analyzed by high-res...

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Abstract

The invention belongs to the field of coal chemistry and carbon material, in particular a process for preparing large amounts of carbon nano tubes using coal as raw material by arc discharge technology under vacuum condition, wherein coal based carbon rod or coal based composite charcoal rod prepared by mixing coal and catalyst is used as anode in the arc plasma apparatus for discharge evaporation under vacuum condition, the reactor is opened after the ending of discharge to obtain large size high purity single walled carbon nano tubes in film shape or gram magnitude pure multiple wall carbon nano tubes.

Description

technical field [0001] The invention belongs to the technical fields of coal chemical industry, petrochemical industry and carbon material, and relates to a method for preparing large quantities of carbon nanotubes by using coal as a raw material and using arc discharge technology under vacuum conditions. Background technique [0002] Carbon nanotube (Carbon nanotube, abbreviated as CNT) is a carbon material with a novel structure discovered in 1991. The ideal carbon nanotube is a seamless hollow tube formed by curling graphite sheets formed by carbon atoms. Carbon nanotubes containing multiple graphite sheets are called multi-walled carbon nanotubes (Multi-walled carbon nanotubes, abbreviated as MWCNT), and carbon nanotubes with only one layer of graphite sheets are called single-walled carbon nanotubes (Single walled carbon nanotubes, abbreviated as SWCNT). The diameter of SWCNT is generally 1-6 nm. Recent studies have found that carbon nanotubes The smallest diameter can...

Claims

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Application Information

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IPC IPC(8): B01J19/08B01J23/74C01B31/02
Inventor 邱介山李永峰王云鹏
Owner DALIAN UNIV OF TECH
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