# US 2010/0167053 A1 · Catalyst composition for preparing carbon nanotube

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- Number: US 2010/0167053 A1
- Document ID: US20100167053A1
- Status: Published application
- Kind: A1
- Application number: 12/453,862
- Filed: 2009-05-26
- Published: 2010-07-01
- Earliest claimed: 2008-12-29
- Assignees: Korea Kumho Petrochemical Co., Ltd.
- Inventors: Hyun-Kyung Sung; Wan Sung Lee; Namsun Choi; Dong Hwan Kim; Youngchan Jang
- Web page: https://patentgrep.com/patent/US20100167053A1

## CPC

- B01J 23/8472: {Vanadium}
- B01J 23/002: {Mixed oxides other than spinels, e.g. perovskite}
- B01J 23/85: Chromium, molybdenum or tungsten
- B01J 23/8892: {Manganese}
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B82Y 40/00: Manufacture or treatment of nanostructures
- C01B 32/162: characterised by catalysts
- B01J 21/185: {Carbon nanotubes (carbon nanotubes per se C01B32/15)}
- B01J 37/03: Precipitation; Co-precipitation
- B01J 37/16: Reducing
- B01J 2523/00: Constitutive chemical elements of heterogeneous catalysts
- C01B 2202/34: Length
- C01B 2202/36: Diameter
- Y10S 977/742: Carbon nanotubes, CNTs
- Y10S 977/843: Gas phase catalytic growth, i.e. chemical vapor deposition
- Y10T 428/2982: Particulate matter [e.g., sphere, flake, etc.]
- 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
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The present invention relates to a catalyst composition for preparing carbon nanotube and a process for preparing carbon nanotube using the same. More particularly, this invention relates to a process for preparing carbon nanotube by the chemical vapor deposition method through the decomposition of lower saturated or unsaturated hydrocarbons using a multi-component metal catalyst composition containing active metal catalyst from Co, V, Al and inactive porous support. Further, the present invention affords the carbon nanotube having 5˜30 nm of diameter and 100˜10,000 of aspect ratio in a high catalytic yield.

## Claims

### Claim 1

A catalyst composition for preparing carbon nanotube represented by following formula.
[COxVyM1z]pM2q
wherein
Co represents catalytic metal of cobalt, its oxide or its derivative;
V represents catalytic metal of vanadium, its oxide or its derivative;
M1 represents at least one catalytic transition metal selected from Al, Fe, Ni, W, Cr, Mn, Sn, Cu, Y, Zr, Ti, Mo or Si, its oxide or its derivative;
M2 represents inactive porous support selected from Mg or Si, its oxide or its derivative;
p and q represent mole fraction of catalytic metal and inactive porous support, respectively.
p+q=1, 0.05≦p≦0.95, 0.05≦q≦0.95,
x, y and z represent mole fraction of Co, V and M1, respectively.
x+y+z=1, 0.03≦x≦0.75, 0.02≦y≦0.75, 0.01≦z≦0.95.

### Claim 2 (depends on 1)

The catalyst composition for preparing carbon nanotube according to claim 1, wherein M1 represents Al and M2 represents Mg.

### Claim 3 (depends on 1)

The catalyst composition for preparing carbon nanotube according to claim 1, wherein the mole fraction of catalytic metal and inactive porous support is 0.10≦p≦0.90, 0.10≦q≦0.90, respectively; and the mole fraction of Co, V and M1 is preferably 0.10≦x≦0.60, 0.10≦y≦0.60, 0.05≦z≦0.70, respectively.

### Claim 4

A process for preparing a catalyst composition for synthesizing carbon nanotube comprising i) co-precipitating or coordinated precipitating a multi-component catalyst composition comprising catalytic metal salt and inactive porous support;
ii) filtering, drying and grinding the obtained co-precipitated catalyst composition; and
iii) calcinating the obtained catalyst composition at 400˜800° C. under air atmosphere.

### Claim 5 (depends on 4)

The process for preparing a catalyst composition according to claim 4, wherein MgO acts as a co-precipitating agent by directly bonding with catalytic metal salt, in a co-precipitating or coordinated precipitating step.

### Claim 6

A process for preparing carbon nanotube comprising
i) preparing a catalyst composition for the synthesis of carbon nanotube;
ii) supplying at least one carbon source selected from saturated or unsaturated
hydrocarbon having 1˜4 carbon atoms to the reactor at 500˜800° C.; and
iii) growing and synthesizing carbon nanotube by decomposition of supplied carbon
source on the surface of a catalyst composition according to chemical vapor deposition method.

### Claim 7 (depends on 6)

The process for preparing carbon nanotube according to claim 6, wherein at the time of supplying carbon source, only gas phase of carbon source is supplied without mixing hydrogen gas which acts as a catalyst reducing agent.

### Claim 8 (depends on 6)

The carbon nanotube having 5˜30 nm of diameter and 100˜10,000 of aspect ratio prepared by the process according to claim 6.

### Claim 9 (depends on 8)

The method for using carbon nanotube of claim 8 as electro-conductive and strength enhanced polymer composite material, support material of fuel battery catalyst, support material of organic process catalyst, storage material for methane and hydrogen gas, electrode material of lithium secondary battery, conductive material of lithium secondary battery, electrode material for high double layer capacitor, emitting material for display and membrane material.