A device and method for preparing carbon airgel by CVD after arc activation of carbon nanotubes

A technology of carbon airgel and carbon nanotubes, applied in chemical instruments and methods, aerosol preparation, carbon compounds, etc., can solve the problems of unfavorable cost control and scale-up production, and achieve simple structure, low bulk density and stable method easy to control effect

Active Publication Date: 2021-02-19
SHANDONG DAZHAN NANO MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carbon airgel prepared by this invention has good mechanical properties, but it still needs multiple freeze-drying and the use of cross-linking agent and guiding borax, which is not conducive to cost control and scale-up production

Method used

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  • A device and method for preparing carbon airgel by CVD after arc activation of carbon nanotubes
  • A device and method for preparing carbon airgel by CVD after arc activation of carbon nanotubes
  • A device and method for preparing carbon airgel by CVD after arc activation of carbon nanotubes

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Pass nitrogen preheated at 800°C from 5 to 1-reactor, and turn on equipment 2 to heat up to 790°C-800°C;

[0061] (2) 900g vertical array carbon nanotube powder is added in the 7-carbon nanotube storage tank, and the nitrogen gas is continuously flushed through 8 for three times and then evacuated for inert gas replacement;

[0062] (3) Turn on the DC arc generating device of 1800W power, so that the tip of the 3-connected iron element emits an electric arc;

[0063] (4) adjust the nitrogen of 3L / min into the 5 inlet, add 5g / min carbon nanotube powder from the 6-carbon nanotube feed inlet and feed 1L / min from the 4-carbon source inlet respectively min Carbon monoxide gas preheated at 750°C;

[0064] (5) the carbon nanotube airgel that generates enters 9 finished product collection tanks through pipeline from the other end of the reactor;

[0065] (6) keeping the reaction for 90min in this way, and continuously preparing high-performance carbon nanotube airgel;

...

Embodiment 2

[0068] (1) Pass the argon gas preheated at 920°C from 5 to the 1-reactor, and turn on the equipment 2 to heat up to 910°C-920°C;

[0069] (2) Add 2000g of vertically arrayed carbon nanotube powder into the 7-carbon nanotube storage tank, carry out five consecutive flushes of argon through 8 and then vacuumize to complete the replacement;

[0070] (3) Open the alternating current arc generating device of 2000W power, make 3-connect the tip of simple nickel to discharge electric arc;

[0071] (4) Adjust the argon of 20L / min into the 5 inlet, and add 12g / min carbon nanotube powder from the 6-carbon nanotube feed inlet and feed 5L from the 4-carbon source inlet respectively. / min methane gas preheated at 880°C;

[0072] (5) the carbon nanotube airgel that generates enters 9 finished product collection tanks through pipeline from the other end of the reactor;

[0073] (6) keeping the reaction for 120min in this way, and continuously preparing high-performance carbon nanotube airg...

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Abstract

In the field of carbon airgel synthesis, the present invention discloses a device and method for preparing carbon airgel by CVD after carbon nanotubes are activated by an electric arc. The vacuum system is connected to the pipeline of the carbon nanotube storage tank, the carbon nanotube storage tank is provided with a carbon nanotube feed port, the left side of the carbon nanotube feed port is provided with an inert carrier gas inlet, and the inert carrier gas inlet passes through the pipeline It is connected to the left end of the reactor, the reactor is equipped with an arc generator, the reactor is equipped with a carbon source inlet, the outside of the reactor is equipped with a temperature control system, and the right end of the reactor is connected to the pipeline of the finished product collection storage tank. The invention uses the high temperature of a high-power arc to excite the metal into fine nano-scale gaseous particles, which can be uniformly coated on the surface of the carbon nanotubes, and then the carbon airgel grown by CVD has a high degree of graphitization and a lower bulk density. Low thermal conductivity and good thermal insulation performance. The device of the invention has simple structure, stable and easy-to-control method, and the continuous preparation of carbon nanotube aerogels with different property indexes can be realized by switching the electric arc power.

Description

technical field [0001] The invention relates to the field of carbon aerogel synthesis, in particular to a device and method for preparing carbon aerogels by CVD after arc activation of carbon nanotubes. Background technique [0002] As a one-dimensional nanomaterial, carbon nanotubes have excellent physical and mechanical properties. They are mainly coaxial circular tubes with several to dozens of layers of carbon atoms arranged in a hexagonal shape. It has a very large aspect ratio, the diameter is usually between 1-100nm, and the length is several microns to hundreds of microns. It is precisely because of its large aspect ratio that carbon nanotubes perform very well in terms of mechanics, electricity, and electrical and thermal conductivity. Due to its excellent properties, carbon nanotubes have broad and potential application prospects in many fields such as catalyst supports, rubber-plastic composite materials, electrochemical materials, and photoelectric sensing. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/168B01J13/00
CPCB01J13/0095C01P2004/03C01P2006/11C01P2006/12C01P2006/32C01B32/168
Inventor 耿磊李少龙田彪徐瑾唐元政张晓光
Owner SHANDONG DAZHAN NANO MATERIALS
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