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US 7,094,385 B2Granted
Process for the mass production of multiwalled carbon nanotubes
AssigneeCnrs
InventorsFrançois Beguin, Sandrine Delpeux, Katarzyna Szostak
Life of this patent
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Abstract
The present invention concerns a process for the mass production of carbon nanotubes and particularly a process for selectively producing multiwalled carbon nanotubes.
Claims22
A process for the selective mass production of multiwalled carbon nanotubes from the decomposition of hydrocarbons on a catalyst precursor, said process comprising:
- a) providing a non-reduced and non-supported precursor of a metallic catalyst, mixed with a non-reactive compound,
- b) treating the mixture with a gas flow, wherein said hydrocarbons are the only reactive gases present in the gas flow, under conditions which enable the production of nascent hydrogen from the decomposition of said hydrocarbon and the reduction of the catalyst precursor into the catalyst in situ with the production of said nanotubes, the catalyst becoming then supported by the non-reactive compound, and
- c) recovering said nanotubes.
A process for the selective mass production of multiwalled carbon nanotubes from the decomposition of hydrocarbons on a catalyst precursor, said process comprising:
- a) providing a non-reduced precursor of a metallic catalyst, contained in a solid solution with a refractory compound,
- b) treating the mixture with a gas flow, wherein said hydrocarbons are the only reactive gases present in the gas flow, under conditions which enable the production of nascent hydrogen from the decomposition of said hydrocarbons and the reduction of the catalyst precursor into the catalyst in situ with the production of said nanotubes, the catalyst becoming supported by the refractory compound, and
- c) recovering said nanotubes.
Dependencies are inferred from the claim text.