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Preparation of high-specific surface area nanometer carbon tube

A technology of high specific surface area and carbon nanotubes, applied in the field of carbon nanotubes, can solve problems such as complicated operation process and unsatisfactory specific surface area effect, and achieve the effect of simple process, rich micropores and small pore size

Inactive Publication Date: 2005-05-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of dispersibility, activator and process factors, the operation process of carbon nanotubes after mechanical pulverization or chemical activation is complicated, and the effect of specific surface area is not ideal.

Method used

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  • Preparation of high-specific surface area nanometer carbon tube
  • Preparation of high-specific surface area nanometer carbon tube
  • Preparation of high-specific surface area nanometer carbon tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Potassium hydroxide is used as the activator, carbon nanotubes are added and the activator is added at the same time, the activator and carbon nanotubes are fully mixed and uniformly dispersed by mechanical ball milling, and the ball milling time is 30 minutes. Wherein: the ratio of carbon nanotubes to activator (mass, the same below) is 1:4; the ratio of ball material (mass, the same below) is 3:1, and the mixture of carbon nanotubes after ball milling is activated at a temperature of 1123K for 1 hour, Then wash with hydrochloric acid to remove the activator and catalyst (brought in the original carbon nanotubes); then wash with a large amount of deionized water until neutral, filter and dry. The prepared carbon nanotubes have a specific surface area of ​​785.2m 2 / g.

[0026] The principle of the present invention is: in the process of mechanical ball milling, the effect of mechanical ball milling on the chopping, opening and defect creation of carbon nanotubes is ef...

Embodiment 2

[0029] The difference from Example 1 is:

[0030] Potassium hydroxide is used as the activator, the activator and carbon nanotubes are fully mixed and uniformly dispersed, and the ball milling time is 25 minutes. The carbon nanotube mixture after ball milling was activated at a temperature of 873K for 3 hours, and then pickled with concentrated hydrochloric acid to remove the activator and catalyst; wherein: the ratio of carbon nanotubes to activator was 1:5; the ratio of ball to material was 10:1, The prepared carbon nanotubes have a specific surface area of ​​542.3m 2 / g.

[0031] see Figure 4a , 4b , 4c, the carbon nanotubes of the present invention, compared with the original carbon nanotubes, have the same tendency as in Example 1.

Embodiment 3

[0033] The difference from Example 1 is:

[0034] Potassium hydroxide was used as the activator, and the activator and carbon nanotubes were fully mixed and uniformly dispersed by mechanical ball milling, and the ball milling time was 60 minutes. The carbon nanotube mixture after ball milling was activated at 1273K for 1 hour, and then hydrochloric acid was added to remove the activator and catalyst; wherein: the ratio of carbon nanotubes to activator was 1:1; the ratio of ball to material was 2:1, and the prepared The specific surface area of ​​carbon nanotubes is 488m 2 / g.

[0035] see Figure 5 , the carbon nanotubes of the present invention, compared with the original carbon nanotubes, have the same tendency as in Example 1.

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Abstract

A production of high specific superficial area nanometer carbon tube is carried out by taking sodium hydroxide and potion as activating agent, mixing and dispersing nanometer carbon and activating agent by mechanical ball milling, and activating treating the ball milled nanometer tube mixture under high temperature. It achieves simple process and high specific superficial area for wide application.

Description

technical field [0001] The invention relates to carbon nanotubes, in particular to a method for preparing carbon nanotubes with a high specific surface area. Background technique [0002] Since Mr. Iijima prepared carbon nanotubes in 1991, it has attracted widespread attention. Because of its unique structure, quasi-one-dimensional nanomaterials, high specific surface area, excellent conductivity, high stability, and unique one-dimensional Dimensional hollow tubular structures, etc., are expected to be used in composite materials, catalyst supports, field emission, catalysts and catalyst supports, lithium-ion secondary battery anode materials, capacitors, high-efficiency adsorbents, separation agents, gas adsorbents and hydrogen storage materials Wait. However, the prepared carbon nanotubes are generally sealed at both ends, have a large aspect ratio and are intertwined, so the specific surface area is small. These limit the application of carbon nanotubes, especially in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C01B31/02
Inventor 成会明陈永刘畅
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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