# US 9,434,617 B2 · Carbon nanotubes and method for manufacturing the same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 9,434,617 B2
- Document ID: US9434617B2
- Status: Granted
- Kind: B2
- Application number: 14/618,729
- Filed: 2015-02-10
- Published: 2015-06-04
- Granted: 2016-09-06
- Earliest claimed: 2012-01-11
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Kyung Yeon Kang; Jin Do Kim; Sung Jin Kim; Jae Keun Yoon
- Web page: https://patentgrep.com/patent/US9434617B2

## CPC

- C01B 32/15: Nano-sized carbon materials
- B01J 23/881: and iron
- B01J 23/883: and nickel
- B01J 31/04: containing carboxylic acids or their salts {(B01J31/0277 - B01J31/0298 take precedence; multi-metal carboxylate complexes like Pd (II) acetate, i.e. Pd3 (OAc) 6 or Cr(II)acetate, i.e. Cr2(OAc)4 B01J31/2226)}
- B01J 37/0203: {the impregnation liquid containing organic compounds}
- B01J 37/08: Heat treatment {(B01J37/0009, B01J37/0018 take precedence)}
- C01B 32/162: characterised by catalysts
- B01J 37/0236: {Drying, e.g. preparing a suspension, adding a soluble salt and drying}
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B82Y 40/00: Manufacture or treatment of nanostructures
- C01B 2202/20: Nanotubes characterized by their properties
- C01B 2202/36: Diameter
- Y10S 977/742: Carbon nanotubes, CNTs
- Y10S 977/843: Gas phase catalytic growth, i.e. chemical vapor deposition
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## 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/m3, 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.

## Claims

### Claim 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/m3,
wherein the two-component carbon nanotube catalyst comprises an alumina support (Al2O3), 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 1)

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.

### Claim 9 (depends on 1)

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.

### Claim 10 (depends on 1)

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.

### Claim 11 (depends on 1)

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