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Graphene preparation method

A graphene and plasma technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of inability to produce in large quantities and low output

Inactive Publication Date: 2018-09-21
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the output is extremely low, and the surface of graphene has a large number of functional groups, which cannot be mass-produced

Method used

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Examples

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Effect test

Embodiment 1

[0035] Embodiment one: a kind of method that takes methane as carbon source to produce graphene: select methane as carbon source, argon as carrier gas, hydrogen as additive; methane, argon and hydrogen with the flow ratio of 1:10:1 (volume than) into the buffer tank, and after being preheated by the heat exchanger, it is passed into the plasma generator in the form of rotating air intake; the discharge voltage of the plasma generator is 10 kV, and the current is 0.8 A; the gas in the plasma The residence time in the device in which the solid generator is combined with the fluidized bed is 10 s, and the temperature of the reactor is 1000-2700 °C; among them, the plasma generator is combined with the fluidized bed through a flare, and the diameter of the fluidized bed is plasma 4 times that of the generator nozzle; the reacted gas-solid mixture is separated from graphene by a cyclone separator, and the tail gas can be recycled to preheat the mixed gas of methane, hydrogen and arg...

Embodiment 2

[0036] Embodiment two: a kind of method of producing graphene with petroleum liquefied gas as carbon source: select petroleum liquefied gas as carbon source, nitrogen as carrier gas, ammonia as additive; petroleum liquefied gas, nitrogen and ammonia with 1:13: The flow ratio (volume ratio) of 0.8 is passed into the buffer tank, and after being preheated by the heat exchanger, it is passed into the plasma generator in the form of rotating air intake; the discharge voltage of the plasma generator is 45 kV, and the current is 0.5 A; the residence time of the gas in the plasma generator combined with the fluidized bed is 5s, and the temperature of the reactor is 2000-5700 ℃; among them, the plasma generator is combined with the fluidized bed through a flare, and the fluidized The diameter of the bed is twice that of the nozzle of the plasma generator; the gas-solid mixture after the reaction is separated from the graphene by the cyclone separator, and the tail gas can be circulated...

Embodiment 3

[0037] Embodiment three: a kind of method that uses coke oven gas as carbon source to produce graphene: select coke oven gas as carbon source, hydrogen as carrier gas and additive; coke oven gas and hydrogen with the flow ratio (volume ratio) of 1:15 It is passed into the buffer tank, and after being preheated by the heat exchanger, it is passed into the plasma generator in the form of rotating air intake; the discharge voltage of the plasma generator is 2 kV, and the current is 1 A; the gas is generated in the plasma The residence time in the device combined with the fluidized bed is 8s, and the temperature of the reactor is 2600-5300 ° C; wherein, the plasma generator is combined with the fluidized bed through a flare, and the diameter of the fluidized bed is the plasma generator nozzle 5 times of that; the reacted gas-solid phase mixture is separated from graphene through a cyclone separator, and the tail gas can be circulated to preheat the mixed gas of coke oven gas and hy...

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Abstract

The invention discloses a graphene preparation method comprising the following steps: performing lytic reaction via a plasma region by selecting a gaseous or gasifiable carbonaceous material as a carbon source, taking a gas which can be ionized to be plasma as carrier gas, taking a gas with reducibility as an additive, using a rotary gas intake manner and driving the carbon source by the carrier gas; after pyrolysis of the carbon source, entering a fluidized bed device, so as to promote further pyrolysis of the carbon source and nucleation and growth of graphene; and separating graphene from tail gas by a cyclone separator, so as to obtain graphene powder; the tail gas can be recycled to be used for preheating mixed gas of the carbon source, the carrier gas and the additive, and enters a plasma generator together with the mixed gas, and therefore, the use amount of the carrier gas can be reduced. According to the method, harsh terms are avoided, and wastes cannot be generated; the graphene is rapidly produced in a gas phase, and the carrier gas and partial non-lytic carbon source can be recycled.

Description

technical field [0001] The invention relates to the technical field of graphene preparation, in particular to a graphene preparation method. Background technique [0002] In 2004, Professor Geim of the University of Manchester in the UK prepared stable graphene for the first time, overturning the theory of static electricity that "thermodynamic fluctuations do not allow two-dimensional crystals to exist freely at a limited temperature", thus triggering an upsurge in the preparation of graphene. Graphene is a carbon atom with sp 2 The orbitals hybridize into bonds to form honeycomb-like two-dimensional materials with a thickness of one atomic layer. Graphene is currently the thinnest material in the world with excellent performance, and its electron mobility can reach 2×10 at room temperature 5 cm 2 ·V -1 ·s -1 , with a thermal conductivity of 5000 W m -1 ·K -1 , with a specific surface area of ​​2630 m 2 g -1 , the Young's modulus is 1100 GPa, and the breaking str...

Claims

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Application Information

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IPC IPC(8): C01B32/184C01B3/22C01B3/24
CPCC01B3/22C01B3/24C01B2203/0272C01B2203/1235C01B2203/1241C01B32/184
Inventor 洪若瑜高茂川王为旺王芳芳
Owner FUZHOU UNIV
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