Method for preparing single walled carbon nanotubes
AssigneeHyperion Catalysis International, Inc.
InventorsXinjie Zhang, Jun Ma, Howard Tennent, Robert Hoch
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Abstract
Methods of preparing single walled carbon nanotubes are provided. Carbon containing gas is contacted with a supported metal catalyst under reaction conditions to yield at least 90% single walled carbon nanotubes and at least 1 gram single walled carbon nanotubes/gram metal catalyst. The support material may be calcined at temperatures between 150 and 600° C., and may have at least one oxidized planar surface. Reaction conditions include less than 10 atmospheres pressure and less than 800° C.
Claims5
1-34. (canceled)
A method for preparing single walled carbon nanotubes comprising the steps of:
- preparing a supported catalyst comprising a metal catalyst and a support material, said support material having at least one planar surface,
- calcining said supported catalyst at temperatures between 150 to 600° C., and
- contacting said supported catalyst with a carbon-containing gas containing oxygen at reaction conditions sufficient to produce at least 90% single walled carbon nanotubes in an amount greater than 1 gram single walled carbon nanotubes per gram metal catalyst,
- wherein the pressure in said reaction conditions is greater than about one and less than 10 atmospheres, the temperature is less than 800° C. and the partial pressure of the carbon-containing gas containing oxygen is maintained at a level conducive to the oxidation of undesirable carbon deposited on said catalyst.
A method for preparing single walled carbon nanotubes comprising the steps of:
- preparing a supported catalyst comprising a metal catalyst and a support material, said support material having at least one planar surface,
- calcining said supported catalyst at temperatures between 150 to 600° C., and
- contacting said supported catalyst with a hydrocarbon at reaction conditions sufficient to produce at least 90% single walled carbon nanotubes in the amount greater than 1 gram single walled carbon nanotubes per gram metal catalyst,
- wherein the pressure in said reaction conditions is greater than about one and less than 10 atmospheres, the temperature is less than 800° C. and the partial pressure of hydrogen is maintained in excess of the stoichiometric level for the reaction taking place.
Dependencies are inferred from the claim text.