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The beneficial effect of CO2 in the low temperature synthesis of high quality carbon nanofibers and thin multiwalled carbon nanotubes from CH4 over Ni catalysts |
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| Authors: | Steven Corthals Jasper Van Noyen Jan Geboers Tom Vosch Duoduo Liang Xiaoxing Ke Johan Hofkens Gustaaf Van Tendeloo Pierre Jacobs Bert Sels |
| Affiliation: | 1. K.U. Leuven, Centre for Surface Chemistry and Catalysis, Kasteelpark Arenberg 23, 3001 Heverlee, Belgium;2. Universiteit Antwerpen, Electron Microscopy for Materials Science (EMAT), Groenenborgerlaan 171, 2020 Antwerpen, Belgium;3. K.U. Leuven, Molecular and Nanomaterials, Celestijnenlaan 200f – Bus 2404, 3001 Heverlee, Belgium |
| Abstract: | A low temperature chemical vapor deposition method is described for converting CH4 into high-quality carbon nanofibers (CNFs) using a Ni catalyst supported on either spinel or perovskite oxides in the presence of CO2. The addition of CO2 has a significant influence on CNF purity and stability, while the CNF diameter distribution is significantly narrowed. Ultimately, the addition of CO2 changes the CNF structure from fishbone fibers to thin multiwalled carbon nanotubes. A new “in situ” cooling principle taking into account dry reforming chemistry and thermodynamics is introduced to account for the structural effects of CO2. |
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