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Method and device for preparing carbon nanotubes

A technology of carbon nanotubes and nanotubes, which is applied in the field of preparing carbon nanotubes, can solve problems such as the general performance of carbon nanotubes, and achieve the effects of large coercivity, high magnetization, and reduced production costs

Pending Publication Date: 2018-02-23
JIANGXI YUEAN SUPERFINE METAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the existing catalysts for preparing carbon nanotubes usually use iron and molybdenum supported on aluminum oxide, or iron, nickel, copper supported on aluminum oxide or magnesium oxide, or directly use metals such as iron and nickel. Alloy powder, but the performance of carbon nanotubes prepared by using these catalysts is average, and most of the purification of carbon nanotubes prepared by using these catalysts in the later stage will go through pickling and water washing processes, which will cause more environmental problems

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  • Method and device for preparing carbon nanotubes
  • Method and device for preparing carbon nanotubes

Examples

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Embodiment 1

[0041] A method for preparing carbon nanotubes, the first choice is to weigh iron pentacarbonyl and nickel tetracarbonyl with a mass ratio of 370:163, and prepare the mass ratio of carbon contained to iron pentacarbonyl and nickel tetracarbonyl to be 5 to 7:3 Carbon source of ~5. Add the mixture of iron pentacarbonyl and nickel tetracarbonyl into the first-stage fluidized bed in the multi-stage serial fluidized bed, heat it at 225°C until it is decomposed to obtain the catalyst, and then remove the carbon monoxide, and then pass it into the multi-stage fluidized bed Inert gas, so that the catalyst is distributed to each fluidized bed, and the temperature of each fluidized bed is kept at 600 ° C for 90 minutes. The above operations are all carried out under the condition of a magnetic field, so that the carbon content of the final carbon nanotubes The ratio of the mass to the catalyst is 5-7:3-5, and then it is passed into a gas-solid separator for gas-solid separation, and the...

Embodiment 2

[0043] A method for preparing carbon nanotubes, the first choice is to weigh iron pentacarbonyl and nickel tetracarbonyl with a mass ratio of 390:178, and prepare the mass ratio of the contained carbon mass to iron pentacarbonyl and nickel tetracarbonyl to be 5 to 7:3 Carbon source of ~5. Add the mixture of iron pentacarbonyl and nickel tetracarbonyl into the first-stage fluidized bed in the multi-stage serial fluidized bed, heat it at 315°C until it is decomposed to obtain the catalyst, and then remove the carbon monoxide, and then pass it into the multi-stage fluidized bed Inert gas, so that the catalyst is distributed to each fluidized bed, and the temperature of each fluidized bed is kept at 800 ° C for 40 minutes. The above operations are all carried out under the condition of a magnetic field, so that the carbon content of the final carbon nanotubes The ratio of the mass to the catalyst is 5-7:3-5, and then it is passed into a gas-solid separator for gas-solid separation...

Embodiment 3

[0045] A method for preparing carbon nanotubes, the first choice is to weigh iron pentacarbonyl and nickel tetracarbonyl with a mass ratio of 390:178, and prepare the mass ratio of the contained carbon mass to iron pentacarbonyl and nickel tetracarbonyl to be 5 to 7:3 Carbon source of ~5. Add the mixture of iron pentacarbonyl and nickel tetracarbonyl into the first-stage fluidized bed in the multi-stage serial fluidized bed, heat it at 315°C until it is decomposed to obtain the catalyst, and then remove the carbon monoxide, and then pass it into the multi-stage fluidized bed Inert gas, so that the catalyst is distributed to each fluidized bed, and the temperature of each fluidized bed is kept at 700 ° C for 50 minutes. The above operations are all carried out under the condition of a magnetic field, so that the carbon content of the final carbon nanotubes The ratio of the mass to the catalyst is 5-7:3-5, and then it is passed into a gas-solid separator for gas-solid separation...

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Abstract

The invention relates to the technical field of preparation of carbon nanotubes, and provides a method for preparing the carbon nanotubes. The method comprises the following preparation steps: addingpentacarbonyl iron and tetracarbonyl nickel into a multistage serial fluidized bed, decomposing to obtain a catalyst, and discharging produced carbon monoxide; adding carbon source and inert gas intothe multistage serial fluidized bed, and reacting for 40-90 minutes while heating at 600-800 DEG C, wherein the ratio of the mass of carbon in the carbon source to the mass of the catalyst is 5-7 to 3-5. The composite carbon nanotubes prepared by the method are good in quality, and because of a relatively good mass ratio of the carbon in the produced composite carbon nanotubes to iron-nickel alloy, a method for synthesizing the iron-nickel alloy into the pentacarbonyl iron and the tetracarbonyl nickel can be subsequently used for purifying the composite carbon nanotubes. The invention furtherprovides a device for preparing the carbon nanotubes. The device is used for implementing the method.

Description

technical field [0001] The invention relates to the technical field of preparing carbon nanotubes, in particular to a method and device for preparing carbon nanotubes. Background technique [0002] Carbon nanotubes, also known as bucky tubes, are one-dimensional quantum materials with a special structure (the radial dimension is on the order of nanometers, the axial dimension is on the order of microns, and both ends of the tube are basically sealed). Carbon nanotubes are mainly coaxial tubes with several to tens of layers of carbon atoms arranged in a hexagonal shape. A fixed distance is maintained between layers, about 0.34nm, and the diameter is generally 2 to 20nm. As a one-dimensional nanomaterial, nanotubes are light in weight, perfectly connected in a hexagonal structure, and have many unusual mechanical, electrical, and chemical properties. At present, the existing catalysts for preparing carbon nanotubes usually use iron and molybdenum supported on aluminum oxide,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/162B01J23/755
CPCB01J23/755C01B32/162B01J21/185B01J35/023B01J35/0013B01J37/086C01B32/164B01J8/1872B01J8/42
Inventor 李上奎王兵李博李显信邹海平朱敏峰
Owner JIANGXI YUEAN SUPERFINE METAL
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