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Preparation of carbon nanometer pipe material and its equipment

A carbon nanotube and nanoscale technology, which is applied in the field of preparing carbon nanotube materials by means of plasma jet, can solve problems such as expensive raw materials, and achieve the effect of long operation period and stable operation.

Inactive Publication Date: 2002-01-02
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the carbon nanotube material preparation and device of the present invention is to overcome the shortcomings of expensive raw materials in the above-mentioned prior art and various defects caused by using raw materials as electrodes, thereby disclosing a method that directly uses cheap coal, carbon materials, glue, etc. A technical scheme for synthesizing carbon nanotube materials and devices without affecting arc stability

Method used

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  • Preparation of carbon nanometer pipe material and its equipment
  • Preparation of carbon nanometer pipe material and its equipment
  • Preparation of carbon nanometer pipe material and its equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Shenfu coal is used as raw material, and the pulverized coal particle size is about 200 mesh. Use H 2 / Ar arc plasma jet, generator power is 40kW; hydrogen flow rate is 5.0m 3 / h, the argon gas flow rate is 1.8m 3 / h, the carrier gas flow rate is 1.2m 3 / h; The powder supply speed is 2.5g / s; After reacting for 5 minutes, a large amount of carbon nanotubes (see figure 2 ).

Embodiment 2

[0028] Baode coal is used as raw material, and the pulverized coal particle size is about 200 mesh, and 5% iron powder by weight of raw coal is added as a catalyst. Use H 2 / Ar arc plasma jet, generator power is 42kW; hydrogen flow rate is 5.2m 3 / h, the flow rate of argon gas is 2.2m 3 / h, the carrier gas is argon, and the flow rate is 1.7m 3 / h; the powder supply speed is 1.5g / s; after reacting for 8 minutes, a large number of carbon nanotubes can be observed by transmission electron microscope in the deposit on the inner wall of the reactor graphite. Carbon nanotubes have an outer diameter of 100 nm and an inner diameter of 30 nm (see image 3 ).

Embodiment 3

[0030] Baode coal is used as raw material, and the pulverized coal particle size is about 200 mesh, and cobalt powder with 7% of the raw coal weight is added as a catalyst. Use H 2 / Ar arc plasma jet, generator power is 40kW; hydrogen flow rate is 5.2m 3 / h, the flow rate of argon gas is 2.2m 3 / h, the carrier gas is argon, and the flow rate is 1.7m 3 / h; the powder supply speed is 3.0g / s; after 10 minutes of reaction, a carbon nanotube with a special structure can be observed in the sediment on the inner wall of the reactor graphite and in the pyrolysis residue in the collector through the transmission electron microscope Material, the graphite sheets of the tube wall of the carbon nanotubes are parallel to each other but inclined to the axial direction of the tube, and the angle between the graphite sheets and the axial direction is 25° to 30°.

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Abstract

The present invention discloses a carbon nanometer pipe material and its equipment, and is characterized by that the said invention can adopt one-step method to implement the process of preparation of nanometer level catalyst granules, mixing catalyst and raw material and synthesizing carbon nanometer pipe material, i.e., utilizes the measures for directly injecting the carbon-contained material and catalyst granules into plasma jet to prepare carbon nanometer pipe material. The invented method features low raw material cost, simple and convenient operation, short technological process and stable working system, and possesses the extensive application field.

Description

1. Technical field [0001] The preparation and device of carbon nanotube materials belong to the interdisciplinary field of coal science and its applied science and material science. Specifically, it is a method and device for preparing carbon nanotube materials with carbonaceous materials as raw materials and using plasma jets. . 2. Background technology [0002] Carbon nanotube is a new type of material discovered since 1991 (Ijima S., [Nature 354, 56, 1991]), and its preparation has always been one of the focuses of people's attention. Ebbesen et al. (Ebbesen T. W., Ajayan P.M., [Nature, 356, 1992]) used two graphite rods as the anode and cathode respectively, and carried out DC discharge under the current conditions of 10-18V and 100A in a 500 Torr atmosphere. The anode is constantly being consumed, while the cathode is constantly accumulating deposits, and the carbon nanotubes are wrapped inside the formed deposits. This method mainly relies on high-temperature electri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/08C01B31/02
Inventor 谢克昌田亚峻朱素渝吕永康
Owner TAIYUAN UNIV OF TECH
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