# US 2015/0147262 A1 · Carbon-containing metal catalyst particles for carbon nanotube synthesis and method of producing the same, catalyst carrier support, and method of producing carbon nanotubes

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- Number: US 2015/0147262 A1
- Document ID: US20150147262A1
- Status: Published application
- Kind: A1
- Application number: 14/409,499
- Filed: 2013-06-20
- Published: 2015-05-28
- Earliest claimed: 2012-06-22
- Assignees: The University of Tokyo; Hitachi Chemical Company, Ltd.
- Applicants: The University of Tokyo; Hitachi Chemical Company, Ltd.
- Inventors: Suguru Noda; Zhongming Chen; Dong Young Kim; Shunsuke Ueda; Eisuke Haba
- Web page: https://patentgrep.com/patent/US20150147262A1

## CPC

- B01J 37/0238: {via the gaseous phase-sublimation}
- B01J 21/18: Carbon
- B01J 21/185: {Carbon nanotubes (carbon nanotubes per se C01B32/15)}
- B01J 23/74: Iron group metals
- B01J 23/745: Iron
- B01J 35/50: characterised by their shape or configuration
- B01J 37/084: {Decomposition of carbon-containing compounds into carbon}
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- C01B 32/05: Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
- C01B 32/162: characterised by catalysts
- B01J 27/20: Carbon compounds
- B01J 35/19: {Catalysts containing parts with different compositions}
- B01J 37/347: {Ionic or cathodic spraying; Electric discharge}
- B01J 2235/00: Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties
- B01J 2235/30: Scanning electron microscopy; Transmission electron microscopy
- B82Y 40/00: Manufacture or treatment of nanostructures
- 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}

## Abstract

The present invention relates to metal catalyst particles for carbon nanotube synthesis, comprising carbon-containing regions on their surfaces.

## Claims

### Claim 1

Carbon-containing metal catalyst particles for carbon nanotube synthesis, comprising carbon-containing regions on surfaces of the carbon-containing metal catalyst particles.

### Claim 2 (depends on 1)

The carbon-containing metal catalyst particles for carbon nanotube synthesis according to claim 1, wherein the carbon-containing metal catalyst particles contain at least one metal selected from the group consisting of Fe, Co, and Ni.

### Claim 3 (depends on 1)

The carbon-containing metal catalyst particles for carbon nanotube synthesis according to claim 1, wherein the carbon-containing metal catalyst particles contain Fe.

### Claim 4 (depends on 1)

The carbon-containing metal catalyst particles for carbon nanotube synthesis according to claim 1, wherein the carbon-containing metal catalyst particles are obtained by flowing a carbon-containing compound gas without an unsaturated bond onto a heated raw material substance to form the carbon-containing regions on surfaces of the raw material substance.

### Claim 5 (depends on 4)

The carbon-containing metal catalyst particles for carbon nanotube synthesis according to claim 4, wherein the carbon-containing compound gas without an unsaturated bond is a saturated hydrocarbon gas.

### Claim 6 (depends on 5)

The carbon-containing metal catalyst particles for carbon nanotube synthesis according to claim 5, wherein the saturated hydrocarbon gas is methane.

### Claim 7 (depends on 1)

A catalyst-carrying support comprising a support and the carbon-containing metal catalyst particles for carbon nanotube synthesis according to claim 1 carried on the support.

### Claim 8 (depends on 7)

The catalyst-carrying support according to claim 7, wherein a density of the carbon-containing metal catalyst particles for carbon nanotube synthesis on the support is one or more particles/100 nm2.

### Claim 9 (depends on 1)

A method of producing the carbon-containing metal catalyst particles for carbon nanotube synthesis according to claim 1, comprising:
a carbon-containing region forming step of flowing a carbon-containing compound gas without an unsaturated bond onto a heated raw material substance to form the carbon-containing regions on surfaces of the raw material substance.

### Claim 10 (depends on 9)

The method of producing a carbon-containing metal catalyst particles for carbon nanotube synthesis according to claim 9, wherein the carbon-containing compound gas without an unsaturated bond is a saturated hydrocarbon gas.

### Claim 11 (depends on 10)

The method of producing a carbon-containing metal catalyst particles for carbon nanotube synthesis according to claim 10, wherein the saturated hydrocarbon gas is methane.

### Claim 12 (depends on 1)

A method of producing carbon nanotubes, comprising a carbon nanotube synthesizing step of flowing a raw material gas onto the heated carbon-containing metal catalyst particles for carbon nanotube synthesis according to claim 1 to synthesize carbon nanotubes.

### Claim 13 (depends on 7)

A method of producing carbon nanotubes, comprising a carbon nanotube synthesizing step of flowing a raw material gas onto the heated catalyst-carrying support according to claim 7 to synthesize carbon nanotubes.