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The effect of feedstock and process conditions on the synthesis of high purity CNTs from aromatic hydrocarbons |
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| Authors: | Nikhil Das Jafar S Soltan Mohammadzadeh John Adjaye |
| Affiliation: | a Catalysis and Chemical Reaction Engineering Laboratories, Department of Chemical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK, Canada S7N 5A9 b Department of Chemical Engineering, Sahand University of Technology, Tabriz, Iran c Syncrude Canada Ltd., Edmonton Research Center, Canada |
| Abstract: | High purity multi-walled carbon nanotubes were synthesized from aromatic hydrocarbons (benzene, toluene, xylene and trimethyl benzene) using ferrocene as the source of Fe catalyst. Screening studies of aromatic feeds at 675 °C, residence time of 14 s and Fe/C atom ratio of 1.07%, resulted in feedstock carbon conversion of 20-31%, CNT yield of 19.8-30.5%, and catalyst yield of 5.3-8.3 (g CNT/g catalyst). While the quality of the CNTs as determined by TGA, SEM, TEM and Raman spectroscopy, were high and comparable for different feedstocks; their carbon conversion, CNT yield and catalyst yield differed noticeably. A process optimization study for toluene feed showed that carbon conversion of more than 39%, CNT yield of 38.7% and catalyst yield of 18.3 can be achieved at temperature of 800 °C, Fe/C atom ratio of 0.47%, and residence time of 10-20 s. |
| Keywords: | Carbon nanotubes Chemical vapour deposition Scanning electron microscopy Transmission electron microscopy Raman spectroscopy |
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