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https://open.uns.ac.rs/handle/123456789/9754
Nаziv: | Synthesis of high-purity carbon nanotubes over alumina and silica supported bimetallic catalysts | Аutоri: | Panić (Ratković), Sanja Kiss, Erne Bošković, Goran |
Dаtum izdаvаnjа: | 1-дец-2009 | Izdаvаč: | Belgrade: Association of the Chemical Engineers of Serbia | Čаsоpis: | Chemical Industry and Chemical Engineering Quarterly | Sažetak: | Carbon nanotubes (CNTs) were synthesized by a catalytic chemical vapor deposition method (CCVD) of ethylene over alumina and silica supported bimetallic catalysts based on Fe, Co and Ni. The catalysts were prepared by a precipitation method, calcined at 600 °C and in situ reduced in hydrogen flow at 700 °C. The CNTs growth was carried out by a flow the mixture of C2H4 and nitrogen over the catalyst powder in a horizontal oven. The structure and morphology of as-synthesized CNTs were characterized using SEM. The as-synthesized nanotubes were purified by acid and basic treatments in order to remove impurities such as amorphous carbon, graphite nanoparticles and metal catalysts. XRD and DTA/TG analyses showed that the amounts of by-products in the purified CNTs samples were reduced significantly. According to the observed results, ethylene is an active carbon source for growing high-density CNTs with high yield but more on alumina-supported catalysts than on their silica-supported counterparts. The last might be explained by SMSI formed in the case of alumina-supported catalysts, esulting in higher active phase dispersion. | URI: | https://open.uns.ac.rs/handle/123456789/9754 | ISSN: | 14519372 | DOI: | 10.2298/CICEQ0904263R |
Nаlаzi sе u kоlеkciјаmа: | TF Publikacije/Publications |
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