초록

Novel catalysts comprised of graphitic nanostructures. The graphitic nanostructure catalysts are suitable for catalyzing reactions such as oxidation, hydrogenation, oxidative-hydrogenation, and dehydrogenation.

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1. A method for activating a catalyst composition for catalyzing a reaction selected from the group consisting of oxidation, hydrogenation, dehydrogenation, oxidative-hydrogenation, and oxidative-dehydrogenation, which catalyst composition is comprised of graphitic nanostructures which nanostructure

1. A method for activating a catalyst composition for catalyzing a reaction selected from the group consisting of oxidation, hydrogenation, dehydrogenation, oxidative-hydrogenation, and oxidative-dehydrogenation, which catalyst composition is comprised of graphitic nanostructures which nanostructures are comprised of a plurality of graphite platelets aligned parallel, perpendicular, or at an angle to the longitudinal axis of the nanostructure and which graphitic nanostructures wherein at least about 50% of its edge sites are exposed, which method for activating comprises treating said nanostructures with a mixture of CO2 and H2 at an effective temperature for period of time from about 0.5 hours to about 70 hours.2. The method of claim 1 wherein at least about 95% of the edge sites of said nanostructures are exposed.3. The method of claim 1 wherein the graphite nanostructure is one wherein the graphite platelets are aligned substantially parallel to the longitudinal axis of the nanostructure.4. The method of claim 1 wherein the graphite platelets are aligned substantially perpendicular to the longitudinal axis of the graphite nanostructure.5. The method of claim 1 wherein at least about 95% of its edge sites of the nanostructures are exposed and wherein its graphite platelets of the nanostructures are aligned substantially parallel to the longitudinal axis of the nanostructure.6. A catalytic process for converting CO2 to CO and water, which process comprises reacting CO2 and hydrogen in the presence of a graphitic nanostructure catalyst composition at a temperature from about 400° C. to about 475° C., which graphitic nanostructure catalyst composition comprised of graphitic nanostructures which nanostructures are comprised of a plurality of graphite platelets aligned parallel, perpendicular, or at an angle to the longitudinal axis of the nanostructure and wherein at least about 50% of the edge sites of said nanostructures are exposed.7. The catalytic process of claim 6 wherein at least about 95% of the edge sites of said nanostructures are exposed.8. The catalytic process of claim 6 wherein the graphite nanostructure is one wherein the graphite platelets are aligned substantially parallel to the longitudinal axis of the nanostructure.9. The catalytic process of claim 6 wherein the graphite platelets are aligned substantially perpendicular to the longitudinal axis of the graphite nanostructure.10. The catalytic process of claim 6 wherein at least about 95% of its edge sites of the nanostructures are exposed and wherein its graphite platelets of the nanostructures are aligned substantially parallel to the longitudinal axis of the nanostructure.