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Method for preparing carbon nanotube from perfluorinated carbon generated by aluminum electrolysis

A technology of perfluorocarbon and carbon nanotubes, applied in the directions of carbon nanotubes, chemical instruments and methods, hydrogen fluoride, etc., to achieve the effects of convenient operation, simple method and easy separation

Active Publication Date: 2022-01-11
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the preparation of carbon nanotubes using perfluorocarbons produced by aluminum electrolysis as raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 1.0g of solid metal aluminum / ccm (PFCs) into a crucible, exhaust the air in the crucible through a vacuum system, feed nitrogen and hydrogen (volume ratio 1:1) at a flow rate of 10ccm, and heat to 680 ℃, then pass the PFCs gas to be decomposed at a flow rate of 10ccm, and react for 5 minutes under closed reaction conditions. After the crucible is cooled to room temperature, the reactants are taken out to obtain aligned carbon nanotubes with a diameter of 0.4nm and a length of 50μm. Afterwards, the metal particles present at the bottom of the carbon nanotubes can be removed by soaking in 1M nitric acid combined with ultrasonic cleaning.

Embodiment 2

[0027] Put 0.75g of solid ferrocene / ccm (PFCs) into an ark reactor, exhaust the air in the ark reactor through a vacuum system, and feed helium and hydrogen at a flow rate of 240ccm (volume ratio of 10:1) Afterwards, heat to 420°C, then pass the PFCs gas to be decomposed at a flow rate of 100ccm, react for 60 minutes under closed reaction conditions, cool the ark reactor to room temperature, take out the reactant, and obtain a diameter of 60nm, a length of 630μm carbon nanotubes. Afterwards, the metal particles present at the bottom of the carbon nanotubes can be removed by soaking in 1M nitric acid combined with ultrasonic cleaning.

Embodiment 3

[0029] Put 0.9g of solid metal magnesium / ccm (PFCs) into a crucible, exhaust the air in the crucible through a vacuum system, and feed in neon gas and hydrogen gas (volume ratio 50:1) at a flow rate of 480ccm, and heat to 660 ℃, then pass the PFCs gas to be decomposed at a flow rate of 160ccm, and react for 4 hours under closed reaction conditions. After the crucible is cooled to room temperature, the reactants are taken out to obtain carbon nanotubes with a diameter of 100nm and a length of 800μm. Afterwards, the metal particles present at the bottom of the carbon nanotubes can be removed by soaking in 1M nitric acid combined with ultrasonic cleaning.

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Abstract

The invention discloses a method for preparing a carbon nanotube from perfluorinated carbon generated by aluminum electrolysis, and the technical scheme is as follows: the perfluorinated carbon generated by aluminum electrolysis is taken as a raw material, a small amount of catalyst is added, and the carbon nanotube is obtained by high-temperature reaction under a specific atmosphere. The perfluorocarbon in the aluminum electrolysis waste gas is used as the raw material, so that the greenhouse effect can be eliminated, and the high-value carbon nanotube can be prepared; and considering that a carbon-fluorine bond is stronger than a carbon-carbon bond, the carbon-fluorine bond can be broken by adopting active metal or combining with strong reducibility of H2 at a relatively high temperature. According to the invention, a small amount of solid catalyst is directly used as a carrier, and particularly, fluorine is directly removed by virtue of the reducibility of hydrogen, so that carbon atoms grow directionally due to the template action of metal, and hydrogen fluoride gas is formed and is used as a secondary resource after being condensed and collected. The method provided by the invention is a brand new method for preparing the carbon nanotube from perfluorinated carbon. The obtained carbon nanotube can be applied to the fields of chemical engineering, new energy and the like.

Description

technical field [0001] The present invention relates to a kind of perfluorocarbon (CF) produced by aluminum electrolysis process 4 、C 2 f 6 and C 3 f 8 ), combined with H 2 The reducibility of the catalyst (Fe, Co, Ni, Al, K, Na, Ca, Mg, etc.), the method for preparing carbon nanotubes belongs to the field of new materials. Background technique [0002] Perfluorocarbons PFCs, mainly including CF 4 、C 2 f 6 and C 3 f 8 etc., are high-potential gases that cause global warming. where CF 4 and C 2 f 6 CO 2 Greenhouse effect equivalents are 6500 and 9200, respectively, CF for tons of Al 4 and C 2 f 6 Emissions equivalent to 1.35 tons of CO 2 , more than 1.22 tons of CO directly produced per ton of electrolytic aluminum produced 2 . CF in flue gas from aluminum electrolysis 4 and C 2 f 6 contributes more to the greenhouse effect than CO 2 Impact. [0003] In the process of electrolysis of aluminum, when the concentration of alumina in the electrolyte is lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/162C01B7/19
CPCC01B32/162C01B7/191C01B2202/34C01B2202/36
Inventor 高彪峰韩云鹏杨一宸张翰
Owner ZHENGZHOU UNIV