Carbon nanotubes containing small amounts of nitrogen are produced by
the pyrolysis of aza-aromatics such as pyridine, methylpyrimidine and
triazine over cobalt nanoparticles in an Ar atmosphere; good yields of
such nanotubes are obtained by carrying out the pyrolysis of a mixtur
e of pyridine and Fe(CO)(5) in flowing Ar + H-2.