Patent ID: 8182782
Filing Date: 2012-05-22
Classification: B82Y,C01B,D01F,H01J,Y10T

Abstract:
1. A method of producing fullerenes comprising double walled nanotubes (DWNTs) via catalytic chemical vapor deposition which comprises (a) providing a source of carbon and a catalyst comprised of transition metal of the iron group of the periodic table of the elements and sulfur in the presence of a hydrogen containing gas and an inert gas in a reaction zone having a DWNT forming atmosphere; (b) heating said source of carbon and catalyst in the presence of said hydrogen containing gas and inert gas in the DWNT forming atmosphere in the reaction zone under conditions effective to produce hot carbon counting vapor and to obtain DWNTs, when said vapor is quenched; (c) quenching the hot vapor in said DWNT forming atmosphere, thus condensing the hot vapor to form a product comprised of DWNTs; and (d) collecting the resulting product and recovering said DWNTs from the resulting product outside the heated region of the reaction zone, wherein the catalyst mixture is comprised of 27% iron, 14% cobalt, 51% nickel and 8% sulfur, by weight.