Method for preparing multiwalled carbon nanotube through microwave enhanced fast pyrolysis of biomass and/or carbonaceous organic waste

A technology of multi-walled carbon nanotubes and organic wastes, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, which can solve the problem that catalysts cannot be reused, unfavorable for carbon nanotube modification, and increasing complexity. degree and other problems, to achieve the effect of reducing the preparation cost, increasing the yield and improving the quality

Active Publication Date: 2015-07-22
THE UNIV OF NOTTINGHAM NINGBO CHINA
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  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned processes all inevitably use catalysts; and the use of catalysts is very complicated. If the catalyst needs to be arranged in advance as a template, then the resulting carbon nanotubes will grow directly on the catalyst, causing separation difficulties. If acid melting is required to dissolve the catalyst removal, resulting in catalysts that cannot be reused and increasing costs; in addition, this method of using catalysts makes the microstructure of the produced carbon nanotubes a straight structure, resulting in fewer defects in carbon nanotubes, which is not conducive to the later development of carbon nanotubes. Modification, but also artificially create defects that are conducive to the combination of functional groups in the later stage, which increases the complexity

Method used

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  • Method for preparing multiwalled carbon nanotube through microwave enhanced fast pyrolysis of biomass and/or carbonaceous organic waste
  • Method for preparing multiwalled carbon nanotube through microwave enhanced fast pyrolysis of biomass and/or carbonaceous organic waste
  • Method for preparing multiwalled carbon nanotube through microwave enhanced fast pyrolysis of biomass and/or carbonaceous organic waste

Examples

Experimental program
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Effect test

Embodiment 1

[0037] After uniformly mixing 500g of dry eucalyptus powder and 500g of microwave absorber CuO (in a microwave electromagnetic field, a heating rate of 161.9°C / min can be achieved), add a closed and N 2 Carrier gas in the quartz reactor, and then place the entire quartz reactor in a 3kw / 2450MHz multimode microwave cavity; adjust N 2 The flow rate (1L / min) was purged for 30 minutes to ensure that there was no oxygen in the reactor; turn on the microwave, set the reaction temperature to 800°C in temperature control mode, and adjust the microwave input power to 2kw to keep the reaction temperature in the reactor constant at 800°C ℃, pyrolysis for 20 minutes, so that the eucalyptus powder is fully decomposed; turn off the microwave, and after the reactor is naturally cooled to room temperature, turn off the N 2 , take out the mixture of eucalyptus pyrolysis residual charcoal and microwave absorber; according to the density difference of eucalyptus pyrolysis residual charcoal and C...

Embodiment 2

[0039] Mix 50g dry pine wood particles with 500g microwave absorber Fe 3 o 4 (A heating rate of 457.5°C / min can be achieved in a microwave electromagnetic field) After uniform mixing, put it into a sealed quartz reactor with Ar carrier gas, and then place the entire quartz reactor in a 3kw / 2450MHz multimode microwave cavity; Adjust the Ar flow rate to 200ml / min, and purge for 30 minutes to ensure that there is no oxygen in the reactor; turn on the microwave, use the temperature control mode to set the reaction temperature to 1000°C, and adjust the microwave power input to 3kw to make the reaction temperature in the reactor Keep at 1000°C, pyrolyze for 2 minutes to fully decompose the eucalyptus powder; turn off the microwave, and after the reactor cools down to room temperature naturally, turn off the Ar, take out the mixture of eucalyptus pyrolysis residual charcoal and microwave absorbent; according to the eucalyptus thermal Residual charcoal and Fe 3 o 4 The densities ar...

Embodiment 3

[0041] 50g dry beech wood powder (particle size600 microns, which can achieve a heating rate of 232.3°C / min in a microwave electromagnetic field) were evenly mixed and then added into a sealed and ventilated He carried the gas in the quartz reactor, and then placed the entire quartz reactor in a 10kw / 2450MHz single-mode microwave cavity; adjusted the He flow rate to 500ml / min, and purged for 10 minutes to ensure that there was no oxygen in the reactor; turned on the microwave , use the temperature control mode to set the reaction temperature to 600°C, adjust the microwave power input power to 10kw, keep the reaction temperature in the reactor constant at 600°C, and pyrolyze for 1 minute to fully decompose the beech wood powder; turn off the microwave and wait for the reactor to After naturally cooling to room temperature, close the He, and take out the mixture of beech wood pyrolysis residual carbon and Co powder; Powder particle size>600 microns), sieve and separate to obtain...

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Abstract

The invention discloses a method for preparing a multiwalled carbon nanotube through microwave enhanced fast pyrolysis of biomass and / or carbonaceous organic waste. The method comprises the following steps: biomass, carbonaceous organic waste, a mixture of the biomass and carbonaceous organic waste or a mixture of the biomass and carbonaceous organic waste uniformly mixed with a microwave absorbent is placed in a reaction vessel in a microwave cavity; an inert gas is introduced into the reaction vessel until an oxygen-free environment is formed; the microwave input power is adjusted to be higher than 500w, and the reaction vessel is heated to 400-1,500 DEG C for a pyrolytic reaction; the multiwalled carbon nanotube is obtained after the reaction. The method for preparing the multiwalled carbon nanotube is cheap and easy, the prepared carbon nanotube is curly, has the mean diameter of 3 nm-200 nm, can be applied to the fields of composites, electrode materials, catalyst preparation and the like and has a broad application prospect.

Description

technical field [0001] The invention relates to a method for preparing multi-walled carbon nanotubes from biomass or carbon-containing organic waste raw materials, in particular to a microwave-enhanced (power greater than 500w) rapid (tens of microseconds to tens of minutes) pyrolysis of biomass and / or Or a method for preparing multi-walled carbon nanotubes from carbon-containing organic waste. Background technique [0002] In recent years, carbon nanotubes have become one of the hotspots in scientific research and industrial applications due to their excellent electrical, mechanical, thermal, magnetic and other physical and chemical properties, and their broad application prospects have gradually emerged. At present, the mainstream carbon nanotube preparation methods include arc discharge method, laser ablation method, chemical vapor deposition method, gas combustion method and hydrocarbon catalytic cracking method, etc., and these methods have introduced appropriate carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y30/00
Inventor 吴韬史楷岐严洁峰
Owner THE UNIV OF NOTTINGHAM NINGBO CHINA
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