Crystalline graphite nanofibers and a process for producing...

C - Chemistry – Metallurgy – 01 – B

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C01B 31/00 (2006.01) C01B 31/02 (2006.01) D01F 9/12 (2006.01) D01F 9/127 (2006.01)

Patent

CA 2420004

A process for producing substantially crystalline graphitic carbon nanofibers comprised of graphic sheets. The graphic sheets are substantially parallel or substantially perpendicular to the longitudinal axis of the carbon nanofiber. When the graphite sheets are to be substantially parallel, these carbon nanofibers are produced by contacting an iron, or an iron:copper, or an iron:nickel bimetallic bulk catalyst with a mixture of carbon monoxide and hydrogen at temperatures from about 670 ~C to about 725 ~C for an effective amount of time. When they are to be substantially perpendicular, the nanofibers are produced by use of an iron:copper bimetallic bulk catalyst at temperatures for about 550 ~C to about 670 ~C.

L'invention concerne un procédé de production de nanofibres de carbone graphitique sensiblement cristallin constituées de feuilles de graphite. Les feuilles de graphite sont sensiblement parallèles ou sensiblement perpendiculaires à l'axe longitudinal de la nanofibre de carbone. Lorsque les feuilles de graphite doivent être sensiblement parallèles, ces nanofibres de carbones sont produites par mise en contact de catalyseur en masse à base de fer ou bimétallique à base de fer:cuivre, ou de fer:nickel, avec un mélange de monoxyde carbone et d'hydrogène à des températures comprises entre 670 ·C environ et 725 ·C environ pendant une durée effective. Lorsque les feuillets de graphite doivent être sensiblement perpendiculaires, les nanofibres sont produites par l'utilisation d'un catalyseur en masse bimétallique fer:cuivre à des températures comprises entre 550 ·C environ et 670 ·C environ.

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