Method for manufacturing nano-carbon substances

Abstract

A catalyst for manufacturing carbon substances, such as carbon nanotube that has a diameter of 1000 nm or less, the catalyst containing at least iron, cobalt or nickel of a first element group and tin or indium of a second element group. The catalyst can be formed by at least tin and indium in addition to cobalt or nickel. The former catalyst provides a 2-component type catalyst and a multi-component type catalyst that is composed on the basis of the 2-component type catalyst, and the later catalyst provides a 3-component type catalyst and a multi-component type catalyst that is composed on the basis of the 3-component type catalyst.

1 - 7 . (canceled)  
     
     
         8 . A method for manufacturing nano-carbon substances consisting essentially of carbon atoms, said method comprising the steps of: 
 exposing a hydrocarbon to a catalyst, said catalyst comprising at least one element of a first element group and one element of a second element group, wherein said first element group consists of cobalt and nickel, and said second element group consists of tin and indium;    heating said catalyst and hydrocarbon to a catalytic decomposition temperature of hydrocarbons;    cooling the catalyst and nano-carbon substance; and    recovering the nano-carbon substance.    
     
     
         9 . The method of manufacturing nano-carbon substances consisting essentially of carbon atoms according to  claim 8 , wherein said first element consists of cobalt and said second element consists of tin, and said nano-carbon substances comprise carbon nanocoils that have a coil diameter of 1000 nm or less.  
     
     
         10 . The method of manufacturing nano-carbon substances consisting essentially of carbon atoms according to  claim 8 , wherein said first element consists of nickel and said second element consists of indium, and said nano-carbon substances comprise carbon nanocoils that have a coil diameter of 1000 nm or less.  
     
     
         11 . A method for manufacturing nano-carbon substances consisting essentially of carbon atoms, said method comprising the steps of: 
 exposing a hydrocarbon to a catalyst, said catalyst comprising at least tin and indium and at least one selected from the group consisting of cobalt and nickel;    heating said catalyst and hydrocarbon to a catalytic decomposition temperature of hydrocarbons;    cooling the catalyst and nano-carbon substance; and    recovering the nano-carbon substance.    
     
     
         12 . The method of manufacturing nano-carbon substances consisting essentially of carbon atoms according to  claim 8  or  11 , wherein said cobalt and said nickel are respectively cobalt oxide and nickel oxide.  
     
     
         13 . The method of manufacturing nano-carbon substances consisting essentially of carbon atoms according to  claim 11 , wherein said tin and said indium are in the form of an ITO film.  
     
     
         14 . A method for manufacturing nano-carbon substances consisting essentially of carbon atoms, said method comprising the steps of: 
 exposing a hydrocarbon to a catalyst, said catalyst being a two-component catalyst, wherein said two-component catalyst consists of iron and one element selected from the group consisting of tin and indium;    heating said catalyst and hydrocarbon to a catalytic decomposition temperature of hydrocarbons;    cooling the catalyst and nano-carbon substance; and    recovering the nano-carbon substance.    
     
     
         15 . The method of manufacturing nano-carbon substances consisting essentially of carbon atoms according to  claim 14 , wherein said two-component catalyst consists of iron and tin, and said nano-carbon substances comprise carbon nanocoils that have a coil diameter of 1000 nm or less.