Catalyst for forming carbon nanotubes

Patent metadata

Field	Value
Publication number	US-9138728-B2
Application number	US-201314376688-A
Country	US
Kind code	B2
Filing date	Feb 22, 2013
Priority date	Feb 22, 2012
Publication date	Sep 22, 2015
Grant date	Sep 22, 2015

Abstract

The present invention provides a catalyst for forming carbon nanotubes that improves a yield at the time of manufacturing carbon nanotubes and enables continuous mass production of carbon nanotubes with high purity. The catalyst for forming carbon nanotubes of the present invention includes a carrier that includes MgO and a metal catalyst that is supported by the carrier, and the concentration of the MgO in the carrier is set equal to 99 mass % or higher.

First claim

The invention claimed is:

1. A catalyst for forming carbon nanotubes, comprising:
a carrier including MgO; and
a metal catalyst supported by the carrier,
wherein a proportion of the MgO in the carrier is equal to 99 mass % or higher.

2. The catalyst for forming carbon nanotubes according to claim 1 , wherein a proportion of sulfur in the carrier is equal to 1 mass % or lower.

3. The catalyst for forming carbon nanotubes according to claim 1 , wherein the metal catalyst supported by the carrier is Fe.

4. The catalyst for forming carbon nanotubes according to claim 1 , wherein the catalyst has an average particle diameter in a range of 0.1 to 10 mm.

5. A method for forming carbon nanotubes, comprising:
filling a fluidized bed with the catalyst for forming carbon nanotubes according to claim 1 ; and
supplying a raw material gas as a source of carbon from a raw material gas supply port disposed in the fluidized bed,
wherein the catalyst for forming carbon nanotubes is filled into the fluidized bed and made to flow within the fluidized bed.

6. The method for forming carbon nanotubes according to claim 5 , wherein a proportion of sulfur in the carrier is equal to 1 mass % or lower.

7. The method for forming carbon nanotubes according to claim 5 , wherein the metal catalyst supported by the carrier is Fe.

8. The method for forming carbon nanotubes according to claim 5 , wherein the catalyst has an average particle diameter in a range of 0.1 to 10 mm.

9. The method for forming carbon nanotubes according to claim 5 , wherein a temperature inside of the fluidized bed is set to a range of 300° C. to 1300° C.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Tomonaga Nariyuki
• Sugiyama Tomoaki
• Mori Yasushi
• Kurisaki Takashi
• SUTO Takanori
• Kikuchi Kota

Classifications

• B01J23/02 Primary

  of the alkali- or alkaline earth metals or beryllium · CPC title

• C01B31/024

  Chemistry & Metallurgy · mapped topic

• C01B31/0233

  Chemistry & Metallurgy · mapped topic

• B01J23/78 Primary

  with alkali- or alkaline earth metals · CPC title

• B01J35/002

  Operations & Transport · mapped topic