4. Conclusions
Nanomaterials, including carbon nanotubes, were successfully
catalytic synthesized on AISI 304 stainless steel meshes
using solid wastes as carbon donors. The controlled burned
of the sugarcane bagasse, corn residue (DDGS), scrap tires,
and post-consumer PET bottles generated several gaseous
hydrocarbons, mainly methane, acetylene, benzene, and
ethylene. The carbon content of these gases was catalytically
converted into nanomaterials by the AISI 304 stainless
steel meshes, which may be proved by the reduction
on the gaseous emissions and the mesh weight increase.
Several types of CNMs were produced (nanotubes, nanoÀ -
bers, and nanoropes), which were determined by the feedstock
used. The produced nanomaterials presented lengths
of 20 õm to 50 õm and diameters in the range of 20 nm
to 200 nm. Therefore, at high temperature (~1,000ºC), the
AISI 304 stainless steel was shown to be an effective lowcost
catalyst for nanomaterials generation through a twostep
growth mechanism.