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A method for preparing carbon nanotubes from coal

A carbon nanotube, coal technology, applied in nanocarbon, carbon nanotubes, chemical instruments and methods, etc., can solve the problems of yield, purity and cost impact of carbon nanotube preparation products

Active Publication Date: 2021-04-20
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of different catalysts and preparation methods will have different effects on the yield, purity and cost of carbon nanotubes.

Method used

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  • A method for preparing carbon nanotubes from coal
  • A method for preparing carbon nanotubes from coal
  • A method for preparing carbon nanotubes from coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] First, take 100 grams of long-flame coal coarse powder and mix it with 25 grams of melamine, 11 grams of cobalt chloride (containing 5 grams of metallic cobalt ions) and 50 grams of water to obtain mixture A. Put mixture A in a ball mill jar, and add metal steel balls for high-energy ball milling until uniformly dispersed slurry mixture B is obtained. After the mixture B is placed in a freeze dryer for freeze drying, the porous block C can be obtained. The block C is placed in a high-temperature atmosphere furnace, mixed with hydrogen and argon gas containing 5% hydrogen, and heated at 1100° C. for 2 hours to prepare clustered carbon nanotubes. Further purification can be carried out by multiple times of acid washing and water washing, and after centrifugation and drying, a cluster-like carbon nanotube powder with a diameter of 60-100 nanometers can be obtained.

[0039] figure 1 Scanning electron microscope image of the prepared carbon nanotubes, Figure 5 It is a t...

Embodiment 2

[0041] First, take 50 grams of anthracite coarse powder and mix it with 10 grams of melamine, 6.5 grams of nickel chloride (containing 3 grams of metallic nickel ions) and 25 grams of water to obtain mixture A. Put mixture A in a ball mill jar, and add metal steel balls for high-energy ball milling until uniformly dispersed slurry mixture B is obtained. After the mixture B is placed in a freeze dryer for freeze drying, the porous block C can be obtained. The block C is placed in a high-temperature atmosphere furnace, mixed with hydrogen and argon gas containing 5% hydrogen, and heated at 800° C. for 2 hours to prepare clustered carbon nanotubes. Further purification can be carried out by multiple times of acid washing and water washing, and after centrifugation and drying, a clustered carbon nanotube powder with a diameter of about 40-50 nanometers can be obtained.

[0042] figure 2 The scanning electron microscope image of the prepared carbon nanotubes shows that the carbo...

Embodiment 3

[0044]First, take the mixture of 100 grams of coking coal and lignite, mix it with 25 grams of melamine, a total of 31.4 grams of cobalt nitrate and nickel nitrate (containing a total of 10 grams of metallic cobalt ions and nickel ions) and 50 grams of water to obtain mixture A. Put mixture A in a ball mill jar, and add metal steel balls for high-energy ball milling until uniformly dispersed slurry mixture B is obtained. After the mixture B is placed in a freeze dryer for freeze-drying, the porous block C can be obtained. The block C is placed in a high-temperature atmosphere furnace, mixed with hydrogen and argon gas containing 5% hydrogen, and heated at 600° C. for 4 hours to prepare clustered carbon nanotubes. Further purification can be carried out by multiple times of acid washing and water washing, and after centrifugation and drying, a clustered carbon nanotube powder with a diameter of about 60-80 nanometers can be obtained.

[0045] image 3 Scanning electron micros...

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Abstract

The invention discloses a method for preparing carbon nanotubes from coal. The powdered coal is mixed with water, melamine and soluble cobalt salt or nickel salt, and then wet-milled by a high-energy ball mill to obtain a slurry mixture. After the mixture is freeze-dried A porous mass is obtained. The block is placed in a high-temperature atmosphere furnace and sintered in a hydrogen / argon mixed atmosphere to prepare clustered carbon nanotubes. Finally, purer carbon nanotubes are obtained by acid washing and water washing. The present invention uses natural coal as a raw material, does not need to carry out pretreatment on coal, has low selectivity to coal types, high yield, and the diameter of prepared carbon nanotubes is between 40-100 nanometers, and the diameter of carbon tubes is evenly distributed; and the preparation process is simple , the process is simplified, the equipment requirement is low, the cost is low, and it is easy to realize industrialized production. It has huge market demand and broad application prospects in the fields of lithium-ion batteries, supercapacitors, nanocatalysis, biomedicine, and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanomaterials, and in particular relates to a method for preparing carbon nanotubes from coal. Background technique [0002] Carbon nanotubes are a special one-dimensional material with a series of excellent comprehensive properties such as high thermal conductivity, high mechanical strength, large specific surface area, high electrical conductivity, strong interface effect, low thermal expansion coefficient, and good chemical stability. Therefore, it has always been a hot spot in various fields of material science research, and has huge market demand and broad application prospects in lithium-ion batteries, supercapacitors, nanocatalysis, biomedicine, environmental protection and other fields. [0003] Graphite arc method, laser evaporation method and chemical vapor deposition method are the main methods for preparing carbon nanotubes at present. Graphite arc method and laser evaporation m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/162
CPCC01B2202/36C01B32/162
Inventor 刘丹王斌杨生春梁工英
Owner XI AN JIAOTONG UNIV
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