Title :
Comparison of Fe/Al2O3 and Fe, Co/Al2O3 catalysts used for production of carbon nanotubes from acetylene by CCVD
Author :
Kónya, Zoltán ; Vesselényi, István ; Lázár, Károly ; Kiss, János ; Kiricsi, Imre
Author_Institution :
Reaction Kinetics Res. Group of the Hungarian Acad. of Sci., Univ. of Szeged, Hungary
fDate :
3/1/2004 12:00:00 AM
Abstract :
Characterization of iron containing alumina supported catalysts was performed by transmission electron microcopy (TEM), Mössbauer, and XPS spectroscopy during formation of multiwall carbon nanotubes from acetylene at 1000 K. TEM images showed that carbon fibers (outer diameter is around 20-40 nm) were generated on Fe/Al2O3 samples while on the bimetallic Fe,Co/Al2O3 carbon nanotubes with an average diameter of 8-12 nm were formed. XPS spectra revealed that Fe-Co alloy formed during the interaction of Fe,Co/Al2O3 and acetylene at 1000 K. The formation of the bimetallic alloy was proven by Mössbauer spectroscopy as well.
Keywords :
Mossbauer effect; X-ray photoelectron spectra; alumina; carbon fibres; carbon nanotubes; catalysts; chemical vapour deposition; cobalt; cobalt alloys; iron; iron alloys; metallic thin films; nanotechnology; transmission electron microscopy; 1000 K; 20 to 40 nm; 8 to 12 nm; C; CCVD; Co-Al2O3; Co/Al2O3 catalysts; F-Co alloy; Fe catalysts; Fe-Al2O3; Fe/Al2O3 catalysts; FeCo-Al2O3; Mossbauer spectra; TEM; XPS; acetylene; alumina; bimetallic Fe; bimetallic alloy; carbon fibers; carbon nanotubes production; multiwall carbon nanotubes; transmission electron microscopy; Aluminum alloys; Amorphous materials; Carbon nanotubes; Chemical lasers; Chemistry; Infrared spectra; Iron; Production; Spectroscopy; Transmission electron microscopy;
Journal_Title :
Nanotechnology, IEEE Transactions on
DOI :
10.1109/TNANO.2004.824033
