Method for preparing carbon nanotube

A technology of carbon nanotubes and quartz tubes, which is applied in the field of synthetic carbon nanotube materials, can solve the problems of modified montmorillonite, molecular sieves, high prices, restrictions on the development of carbon nanomaterials, and cumbersome preparation conditions, and achieves low price and low cost , source-rich effects

Inactive Publication Date: 2019-03-01
NORTHEAST FORESTRY UNIVERSITY
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Problems solved by technology

[0003] Carbon nanotubes and their network structures have broad application prospects in various fields due to their special microscopic morphology and excellent physical and chemical properties. However, factors such as cumbersome preparation conditions and high raw material costs limit the application of carbon nanomaterials. develop
China's patent application (application number 200510017038.0) has reported the synthesis of carbon nanotubes under the effects of polyolefin as carbon source, nickel-containing catalyst, modified montmorillonite and molecular sieve additives, but the modified montmorillonite and molecular sieve used in the method are relatively expensive. High, in addition, the use of hydrofluoric acid to remove montmorillonite and molecular sieves to purify carbon nanotubes has caused pollution to the environment

Method used

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  • Method for preparing carbon nanotube

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Co‐Mo / MgO catalysts were prepared by combustion method. Grind cobalt nitrate, ammonium molybdate, and magnesium nitrate with a high-speed pulverizer, grind them thoroughly in a mortar, mix them in a molar ratio of 1:0.5:1, dissolve them with an appropriate amount of polyethylene glycol 200, stir them fully, and let them stand for 24 hours Then put it into a muffle furnace at 650°C for calcination for 1 hour, collect the product, cool it to room temperature, and grind it into a powder with a particle size of about 1 μm with a mortar to obtain a supported bimetallic Co-Mo / MgO catalyst.

[0022] According to the weight ratio, 86% polyethylene, 7% Co-Mo-Mg catalyst and 7% carbon black were uniformly mixed for 10 min in a torque rheometer at a temperature of 150 ° C and a rotation speed of 50 rpm to obtain a polyethylene mixture.

[0023] Take 5 g of the above-mentioned polymer and put it into a quartz tube, replace the air in the tube with nitrogen gas with a flow rate of 5...

Embodiment 2

[0026] Co‐Mo / MgO catalysts were prepared by combustion method. Grind cobalt nitrate, ammonium molybdate, and magnesium nitrate with a high-speed pulverizer, grind them thoroughly in a mortar, mix them in a molar ratio of 2:0.5:1, dissolve them with an appropriate amount of polyethylene glycol 200, stir them fully, and let them stand for 24 hours Then put it into a muffle furnace at 650°C for calcination for 1 hour, collect the product, cool it to room temperature, and grind it into a powder with a particle size of about 1 μm with a mortar to obtain a supported bimetallic Co-Mo / MgO catalyst.

[0027] According to the weight ratio, 86% polyethylene, 7% Co-Mo-Mg catalyst and 7% carbon black were uniformly mixed for 10 min in a torque rheometer at a temperature of 150 ° C and a rotation speed of 50 rpm to obtain a polyethylene mixture.

[0028] 5 g of the above blend was taken, prepared and purified by the method of Example 1, and 3 g of carbon nanotubes were obtained.

Embodiment 3

[0030] Co‐Mo / MgO catalysts were prepared by combustion method. Grind cobalt nitrate, ammonium molybdate, and magnesium nitrate with a high-speed pulverizer, grind them thoroughly in a mortar, mix them in a molar ratio of 3:0.5:1, dissolve them with an appropriate amount of polyethylene glycol 200, stir them fully, and let them stand for 24 hours Then put it into a muffle furnace at 650°C for calcination for 1 hour, collect the product, cool it to room temperature, and grind it into a powder with a particle size of about 1 μm with a mortar to obtain a supported bimetallic Co-Mo / MgO catalyst.

[0031] According to the weight ratio, 86% polyethylene, 7% Co-Mo-Mg catalyst and 7% carbon black were uniformly mixed for 10 min in a torque rheometer at a temperature of 150 ° C and a rotation speed of 50 rpm to obtain a polyethylene mixture.

[0032] 5 g of the above blend was taken, prepared and purified by the method of Example 1, and 2.97 g of carbon nanotubes were obtained.

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Abstract

The invention belongs to the technical field of synthetic carbon nanotube materials and provides a method for preparing carbon nanotubes from polyolefin as a carbon source, loaded type double-metal Co-Mo as a catalyst and carbon black as a splitting synergist through physical commixing and splitting. The method is characterized in that the polyolefin is pure and recycled polyolefin, the carbon black is a nano-grade synergist which participates in carbon nanotube synthesis, and the catalyst is a double-metal efficient catalyst. The materials are comixed according to a certain ratio, and carbonnanotubes are prepared through high-temperature combustion or high-temperature splitting in the presence of an inert gas. The method is simple in equipment, convenient to operate, good in repeatability, low in cost, high in yield and good in carbon nanotube quality. The recycled polyolefin is resource reuse, environment pollution can be solved, due to adoption of the nano-grade carbon black, non-carbon impurities in a product can be reduced, and due to adoption of the double-metal catalyst, the quality of the carbon nanotubes can be improved.

Description

technical field [0001] The invention belongs to the technical field of synthesizing carbon nanotube materials. A new method for preparing carbon nanotubes by synergistic catalytic cracking using polyolefin as a carbon source, supported bimetallic Co-Mo as a catalyst, and carbon black as a cracking synergist is disclosed. Background technique [0002] Carbon nanotubes (CNTs) have been discovered by electron microscope scientists under high-resolution transmission electron microscopy since 1991. Carbon nanotube is a new type of carbon structure, which is a nanoscale crystal of graphite. It can be abstractly regarded as a hollow tubular structure formed by hexagonal graphite sheets spiraling around the central axis at a specific angle, and sealed at both ends. The diameter of carbon nanotubes is generally not greater than 100nm, and the length can reach the micron level, so its aspect ratio is very large, and it can be regarded as a one-dimensional quantum material. With its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/162B01J23/882
CPCB01J23/882C01P2002/72C01P2002/82C01P2004/03C01P2004/04
Inventor 宋荣君苏璇谭盛男
Owner NORTHEAST FORESTRY UNIVERSITY
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