Method for preparing carbon nanotubes from coal

A carbon nanotube and 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, and achieve batch preparation, improve The effect of catalytic efficiency and low manufacturing cost

Active Publication Date: 2020-02-04
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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  • Method for preparing carbon nanotubes from coal
  • Method for preparing carbon nanotubes from coal
  • 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 method comprises the steps that pulverized coal is mixed with water, melamine and a soluble cobalt salt or a nickel salt,then a high-energy ball mill is utilized for wet milling to obtain a slurry-like mixture, and after the mixture is subjected to freeze drying, a porous blocky material is obtained; the blocky material is placed in a high-temperature atmosphere furnace to be sintered in a hydrogen/argon mixed atmosphere, and thus the clustered carbon nanotubes can be prepared; and finally, the pure carbon nanotubes are obtained through pickling and washing with water. The natural coal is utilized as the raw material, the coal does not need to be pre-treated, selectivity to the coal type is low, the yield is high, the diameters of the prepared carbon nanotubes are 40 nm to 100 nm, and the diameters of the carbon tubes are evenly distributed; and the preparation process is simple, a technology is simplified,the equipment requirements are low, the cost is low, and industrial production is easy to realize. The carbon nanotubes have great market demands and broad application prospects in the fields of lithium-ion batteries, super capacitors, nano catalysis, biomedicine, environmental protection and the like.

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 Applications(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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