Carbon nanotubes and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-9434617-B2
Application number	US-201514618729-A
Country	US
Kind code	B2
Filing date	Feb 10, 2015
Priority date	Jan 11, 2012
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

Disclosed are carbon nanotubes and a method for manufacturing the same. Advantageously, the method provides a high yield of potato or sphere-shaped non-bundled carbon nanotubes having a bulk density of 80 to 250 kg/m 3 , an ellipticity of 0.9 to 1.0 and a particle diameter distribution (Dcnt) of 0.5 to 1.0 using a two-component carbon nanotube catalyst comprising a catalyst component and an active component.

First claim

What is claimed is:

1. Carbon nanotubes comprising:
a two-component carbon nanotube catalyst,
wherein a bulk density of the carbon nanotubes is in a range of 80 to 250 kg/m 3 ,
wherein the two-component carbon nanotube catalyst comprises an alumina support (Al 2 O 3 ), a catalyst component, multicarboxylic acid and an active component,
wherein the number of moles (x) of the catalyst component and the number of moles (y) of the active component satisfy 34≦x≦46, 2≦y≦9 and 40≦x+y≦53, based on 100 mol of the alumina support, and
wherein the two-component carbon nanotube catalyst is prepared by mixing a clear aqueous metal solution including the catalyst component, the active component and the multicarboxylic acid with the alumina support.

2. The carbon nanotubes according to claim 1 , wherein the carbon nanotubes are potato or sphere-shaped non-bundled carbon nanotubes having an ellipticity of 0.9 to 1.0 and a particle diameter distribution (Dcnt) of 0.5 to 1.0.

3. The carbon nanotubes according to claim 1 ,
wherein the clear aqueous metal solution has a concentration of 0.1 to 0.4 g/ml, obtained by sequentially adding the multicarboxylic acid and the catalyst component to the active component.

4. The carbon nanotubes according to claim 1 , wherein the number of moles (x) of the catalyst component and the number of moles (y) of the active component satisfy 36≦x≦46, 4≦y≦9 and 43≦x+y≦53, based on 100 mol of the alumina support.

5. The carbon nanotubes according to claim 1 , wherein the catalyst component comprises at least one selected from Fe and Ni.

6. The carbon nanotubes according to claim 1 , wherein the active component comprises Mo.

7. The carbon nanotubes according to claim 1 , wherein the multicarboxylic acid comprises at least one selected from dicarboxylic acid, tricarboxylic acid and tetracarboxylic acid.

8. The carbon nanotubes according to claim 1 , wherein a molar ratio of the multicarboxylic acid to the active component is 0.2 to 0.5.

9. The carbon nanotubes according to claim 1 , wherein the two-component carbon nanotube catalyst has a structure in which the catalyst component and the active component are coated as a monolayer or a multilayer onto the surface and into micropores of the alumina support.

10. The carbon nanotubes according to claim 1 , wherein the two-component carbon nanotube catalyst has an ultrasonic fine powder measured based on number average particle diameter, of 10% or less.

11. The carbon nanotubes according to claim 1 , wherein the carbon nanotubes have a strand diameter of 10 to 50 nm.

Assignees

• Lg Chemical Ltd

Inventors

• Kang Kyung Yeon
• Kim Jin Do
• Kim Sung Jin
• Yoon Jae Keun

Classifications

• B01J37/0236

  Drying, e.g. preparing a suspension, adding a soluble salt and drying · CPC title

• C01B2202/20

  Nanotubes characterized by their properties · CPC title

• C01B31/02

  Chemistry & Metallurgy · mapped topic

• B01J23/755

  Nickel · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title