Shajahan , M. and Mo , Y. H. and Kibria, A. K. M. F. and Kim , M. J. and Nahm , K. S. (2004) High growth of SWNTs and MWNTs from C2H2 decomposition over Co-Mo/MgO catalysts. CARBON, 42 (11). pp. 2245-2253. ISSN 0008-6223
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A series of MgO supported catalysts having Co and Mo metals 5-40 wt.% in a ratio of 1:1 was prepared by impregnation method. Carbon nanotubes (CNTs) were grown over the catalysts by decomposition Of C2H2 at 800 degreesC for 30 min. It was found that 5 and 10 wt.% Co-Mo/MgO catalysts produced single-wall nanotubes (SWNTs), whereas 20, 30 and 40 wt.% Co-Mo/MgO catalysts produced multi-wall nanotubes (MWNTs). The catalyst Mo/MgO was inactive in growing CNTs. In Co-Mo/MgO catalysts, however Mo generated a favorable environment to grow SWNTs. The growth of SWNTs was strongly dependent on the formation of small clusters of cobalt, which may generate from the decomposition Of CoMoO4 species during the nanotube growth. MWNTs were produced over comparatively larger cobalt clusters generated from Co3O4 phase during the nanotube growth stage. The yields of SWNTs were about 6% and 27% over 5 and 10 wt.% Co-Mo/MgO catalysts, respectively. MWNTs yield (576%) was observed over 40 wt.% Co-Mo/MgO catalyst. Carbon yield (%) highly varied with acetylene concentration. (C) 2004 Elsevier Ltd. All rights reserved.
|Subjects:||Physical Science > Nanophysics|
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Physics|
Faculty of Engineering, Science and Mathematics > School of Chemistry
|Deposited On:||19 Oct 2010 09:58|
|Last Modified:||19 Oct 2010 09:58|
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