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Method for preparing metal catalyst for preparing carbon nanotubes and method for preparing carbon nanotubes using the same

A technology of metal catalysts and carbon nanotubes, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. To avoid problems such as temperature limitations, achieve excellent uniformity, less side reactions, and improve productivity

Inactive Publication Date: 2015-05-20
HANWHA CHEMICAL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, a spray pyrolysis method has been disclosed in Korean Patent Laid-Open No. 2003-0091016 (Patent Document 1), which is to spray / fine the catalyst metal precursor solution to burn the catalyst metal precursor solution, but most of the prepared The catalyst has an average particle diameter of 0.1 micrometers to several micrometers, so that there is a limit in fineness, or there is a problem that it is difficult to mass-produce the catalyst or the economical efficiency is deteriorated

Method used

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  • Method for preparing metal catalyst for preparing carbon nanotubes and method for preparing carbon nanotubes using the same
  • Method for preparing metal catalyst for preparing carbon nanotubes and method for preparing carbon nanotubes using the same
  • Method for preparing metal catalyst for preparing carbon nanotubes and method for preparing carbon nanotubes using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] [Example 1] Preparation of a spare metal catalyst for carbon nanotubes

[0051] 1. Put 34.16g iron(III) nitrate nonahydrate and 13.27g cobalt(II) nitrate hexahydrate as transition metal precursors into 100mL distilled water, and use a magnetic stirrer to stir for 10 minutes to dissolve completely, thus preparing transition metal precursor solution.

[0052] 2. 100g ammonium carbonate ((NH 4 ) 2 CO 3 ) as a pH adjusting agent was put into 400 mL of distilled water, and were mixed with each other for 2 hours using a bath sonicator to completely dissolve, thereby preparing a pH adjusting solution.

[0053] 3. Add 100g of aluminum hydroxide (Al(OH) 3 ) as a carrier was put into 200 mL of distilled water in a 2 L beaker and mixed, thereby preparing a carrier dispersion solution.

[0054] 4. Use the dropping funnel to drop the transition metal precursor solution and the pH adjustment solution at a rate of 15ml / min, while using a mechanical stirrer to stir the prepared ca...

preparation Embodiment 1

[0066] [Preparation Example 1] Preparation of carbon nanotubes

[0067] 1. Using the catalysts obtained in Examples and Comparative Examples to prepare carbon nanotubes by thermal chemical vapor deposition, the preparation method is as follows. 0.5 g of catalyst was evenly applied on a quartz boat, which was then placed in the center of a quartz tube with a diameter of 190 nm. After the temperature of the reactor was raised to 700° C. under a nitrogen atmosphere, ethylene gas (1SLM) and hydrogen gas (1SLM) were injected at a ratio of 1:1 for 30 minutes, thereby producing carbon nanotubes.

experiment Embodiment 1

[0068] [Experimental Example 1] Catalyst shape analysis

[0069] In order to analyze the shape of the metal catalyst prepared by carbon nanotubes prepared in Example 1, the shape was observed using a scanning electron microscope (SEM) and a transmission electron microscope (TEM), and the SEM photo and the TEM photo are shown in figure 1 and 2 .

[0070] It is observed that the average diameter of the prepared metal catalyst of carbon nanotubes prepared in Example 1 is 1.4 μm

[0071] In addition, the shapes of the metal catalysts prepared by the carbon nanotubes prepared in Comparative Examples 1 and 2 were observed using a scanning electron microscope (SEM), and the SEM photographs of the metal catalysts prepared in Comparative Examples 1 and 2 are shown in image 3 and 4 . As a result of the analysis, it was confirmed that the average diameters of the metal catalysts prepared in Comparative Examples 1 and 2 were 23 μm and 140 μm, respectively.

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Abstract

Provided are a method for preparing a metal catalyst for preparing carbon nanotubes and a method for preparing carbon nanotubes using the same. More specifically, the present invention relates to a method for preparing a metal catalyst for preparing carbon nanotubes using a deposition-precipitation method, the method including: preparing a support dispersion solution in which a solid support is dispersed in a solvent; and injecting a metal precursor salt solution and a pH adjusting solution into the dispersion solution to prepare a mixed solution and adsorbing metal oxides or metal hydroxides formed therefrom on a surface of the solid support to prepare a catalyst particle. In the metal catalyst for preparing carbon nanotubes according to the present invention, a use rate of a metal component, which is an active component of the catalyst, may be high, such that a synthetic yield of the carbon nanotube may be high, side reactions may be small, and carbon nanotubes having a more uniform shape may be synthesized.

Description

technical field [0001] The present invention relates to a method for preparing a metal catalyst for carbon nanotubes and a method for preparing carbon nanotubes using the catalyst. Background technique [0002] A carbon nanotube has a shape in which a graphite face of a hexagonal honeycomb formed by bonds between one carbon atom and three other carbon atoms is rolled up in a circle to have a nanometer-sized diameter, and the carbon nanotube is Large molecules with unique physical properties based on their size and shape. Carbon nanotubes are light because they are hollow therein, and have electrical conductivity as good as copper, excellent thermal conductivity as diamond, and tensile strength equivalent to steel. Since carbon nanotubes have a bonded structure forming a cylindrical shape, even if impurities are not intentionally added, the electrical properties of carbon nanotubes vary from conductors to semiconductors due to intertube interactions. Carbon nanotubes can be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/02B01J23/755C01B31/02B28B3/00B01J35/00
CPCB82Y30/00B82Y40/00B01J37/03B01J37/035B01J23/10B01J23/20B01J23/24B01J23/40B01J23/70C01B32/162B01J23/75B01J35/391B01J35/40B01J35/45B01J23/755B01J37/02B01J37/04B82B3/0004B82B3/0009
Inventor 赵伸齐金荣光朴寿永姜哈娜崔荣喆
Owner HANWHA CHEMICAL CORPORATION