Hexagonal mesoporous molecular sieve materials (HMS) with different pore si
zes were applied as supports of Fe-loading catalysts to catalytically synth
esize carbon nanotubules. The larger the pore size of HMS is, not only the
larger the pore size of the formed carbon nanotubes is, but also the longer
the reaction time is. It was observed that the growth of carbon nanotubes
can be orientated by the one-dimensional mesoporous structure of HMS.