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29 April 2003 Comparison of Fe/Al2O3 and Fe,Co/Al2O3 catalysts used for production of carbon nanotubes from acetylene by CCVD
Zoltan Konya, Istvan Vesselenyi, Karoly Lazar, Janos Kiss, Imre Kiricsi
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Proceedings Volume 5118, Nanotechnology; (2003) https://doi.org/10.1117/12.501324
Event: Microtechnologies for the New Millennium 2003, 2003, Maspalomas, Gran Canaria, Canary Islands, Spain
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.
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Zoltan Konya, Istvan Vesselenyi, Karoly Lazar, Janos Kiss, and Imre Kiricsi "Comparison of Fe/Al2O3 and Fe,Co/Al2O3 catalysts used for production of carbon nanotubes from acetylene by CCVD", Proc. SPIE 5118, Nanotechnology, (29 April 2003); https://doi.org/10.1117/12.501324
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KEYWORDS
Iron
Carbon nanotubes
Carbon
Spectroscopy
Infrared spectroscopy
Transmission electron microscopy
Particles
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