Process of activating carbon nanotube of great specific surface area

A high specific surface area, carbon nanotube technology, applied in the field of nanomaterials, can solve the problems of immature activation technology and not obvious activation effect, and achieve the effect of being suitable for mass production, low gas price and high yield

Inactive Publication Date: 2007-01-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for activating carbon nanotubes with a high specific surface area in view of the fact that the current domestic activation technology for carbon nanotubes is not mature enough and the activation effect is not very obvious.

Method used

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  • Process of activating carbon nanotube of great specific surface area

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Experimental program
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Effect test

Embodiment 1

[0015] KOH and carbon nanotubes were first mixed directly by physical and mechanical methods at a mass ratio of 5:1, and then dried. The activation reaction is carried out in a horizontal quartz tube furnace. Under the protection of nitrogen gas, the temperature is raised to 700°C, the heating rate is 15°C / min, the flow rate of argon gas is adjusted to 80l / h, and the reaction time lasts for 0.5 hours. After the reaction was completed, the collected product was reacted in dilute HCl (concentration: 0.5M) solution for 1 hour, then washed and dried with deionized water, filtered and dried to obtain a purified product. The product is an activated multi-walled carbon nanotube with a large number of micropores and other defects, and the specific surface area is 480m 2 / g, the pore volume is 0.8cm 3 / g.

Embodiment 2

[0017] KOH and carbon nanotubes were first mixed directly by physical and mechanical methods at a mass ratio of 4:1, and then dried. The activation reaction is carried out in a horizontal quartz tube furnace. Under the protection of argon gas, the temperature is raised to 800°C, the heating rate is 15°C / min, the flow rate of nitrogen gas is adjusted to 90l / h, and the reaction time lasts for 1 hour. After the reaction was completed, the collected product was reacted in dilute HCl (concentration: 0.5M) solution for 1 hour, then washed and dried with deionized water, filtered and dried to obtain a purified product. The product is an activated multi-walled carbon nanotube with a large number of micropores and other defects, and the specific surface area is 530m 2 / g, the pore volume is 1.06cm 3 / g.

Embodiment 3

[0019] KOH and carbon nanotubes were first mixed directly by physical and mechanical methods at a mass ratio of 5:1, and then dried. Under the protection of nitrogen, the temperature was raised to 850° C. at a rate of 15° C. / min, the flow rate of nitrogen gas was adjusted to 80 l / h, and the reaction lasted for 1 hour. A large amount of product can be collected in the collector. After the reaction was completed, the collected product was reacted in dilute HCl (concentration: 0.5M) solution for 1 hour, then washed and dried with deionized water, filtered and dried to obtain a purified product. The product is activated crystalline multi-walled carbon nanotubes with a large number of micropores and other defects ( figure 1 and figure 2 ), figure 1 It shows that carbon nanotubes produce a large number of defect structures such as micropores after activation. figure 2 It shows that the carbon nanotubes still retain the graphite crystal structure after activation. After activa...

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Abstract

The present invention is process of activating carbon nanotube in great specific surface area, and belongs to the field of nanometer material technology. The technological process includes the following steps: 1. mixing KOH and carbon nanotube in the mass ratio of 3-5 physically and stoving; 2. reacting in a horizontal tubular quartz furnace for 0.5-2 hr through introducing inert gas, raising the temperature in the rate of 15 deg.c/min to the reaction temperature 700-900 deg.c and regulating gas carrier flow rate to 80-100 l/hr; and 3. collecting the reaction product, acid washing the product with dilute hydrochloric acid solution, water washing, filtering and stoving. The process has facile material, low cost, no environmental pollution, obvious activating effect and other advantages, and the activated carbon nanotube possesses specific surface area of 400-1100 sq m/g and pore volume of 0.8-1.7 cu cm/g.

Description

technical field [0001] The invention relates to a method in the technical field of nanomaterials, in particular to an activation method for carbon nanotubes with high specific surface area. Background technique [0002] Due to its special geometric structure, carbon nanotubes have very important applications in fields such as physical chemistry. Especially in the fields of hydrogen storage, supercapacitor, molecular filter, adsorbent, fuel cell catalyst carrier, etc., it has broad application prospects. Applications in these fields not only have certain requirements for the crystal structure of carbon nanotubes, but also have relatively high requirements for their specific surface area and pore volume. However, most of the originally prepared carbon nanotubes have a relatively low specific surface area, generally in the range of 200m 2 Below / g, it is very unfavorable for applications with relatively high surface activity requirements. In order to obtain carbon nanotubes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 牛俊杰王健农
Owner SHANGHAI JIAO TONG UNIV
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