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Proceedings Paper

Comparison of Fe/Al2O3 and Fe,Co/Al2O3 catalysts used for production of carbon nanotubes from acetylene by CCVD
Author(s): Zoltan Konya; Istvan Vesselenyi; Karoly Lazar; Janos Kiss; Imre Kiricsi
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Paper Abstract

Investigation of the properties of nanometer sized particles is in the focus of material and chemical science. Several questions about the synthesis and application of carbon nanotubes have been addressed the researchers working in nanoscience and nanotechnology. The catalytic chemical vapor deposition (CCVD) method proved to be one of the most prosperous technologies for large scale production of both single and multiwall carbon nanotubes. It has been proven that supported transition metals are the most productive catalysts for CCVD. The bimetallic catalysts showed excellent catalytic activity in conversion of acetylene to multi wall carbon nanotubes (MWNT) . In our previous papers, we dealt with the cobalt-iron bimetallic catalytic system. We showed that the best quality MWNTs with high yield was observed on Co-Fe catalyst. From the in situ XPS results we concluded that Co-Fe alloy phase should be formed on the catalyst treated at high temperature in acetylene atmosphere, furthermore, we attributed the effectiveness of this catalyst to the presence of alloy phase. However, we have also indicated the importance of Mössbauer spectroscopic studies. In this contribution we report on the results of Mössbauer spectroscopy supplementing our previous conclusions drawn by chemical and XPS techniques.

Paper Details

Date Published: 29 April 2003
PDF: 9 pages
Proc. SPIE 5118, Nanotechnology, (29 April 2003); doi: 10.1117/12.501324
Show Author Affiliations
Zoltan Konya, Univ. of Szeged (Hungary)
Istvan Vesselenyi, Univ. of Szeged (Hungary)
Karoly Lazar, Institute of Isotope and Surface Chemistry (Hungary)
Janos Kiss, Univ. of Szeged (Hungary)
Imre Kiricsi, Univ. of Szeged (Hungary)

Published in SPIE Proceedings Vol. 5118:
Robert Vajtai; Xavier Aymerich; Laszlo B. Kish; Angel Rubio, Editor(s)

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