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

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...

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Vydané v:	Carbon (New York) Ročník 50; číslo 2; s. 372 - 384
Hlavní autori:	Corthals, Steven, Van Noyen, Jasper, Geboers, Jan, Vosch, Tom, Liang, Duoduo, Ke, Xiaoxing, Hofkens, Johan, Van Tendeloo, Gustaaf, Jacobs, Pierre, Sels, Bert
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	Kidlington Elsevier 01.02.2012
Predmet:	carbon carbon dioxide carbon nanotubes Catalysis catalysts Chemistry cooling Cross-disciplinary physics: materials science; rheology Exact sciences and technology Fullerenes and related materials; diamonds, graphite General and physical chemistry Materials science methane nanofibers nickel Physics Specific materials temperature Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry vapors Methane Stability Catalysts In situ Carbon nanotubes Purity Nanofiber Oxides Perovskites Reforming Carbon Fibers CVD Thermodynamics Chemistry Synthesis Multiwalled nanotube Spinel Spinels Distribution Catalyst supports Structure Diameter Low temperature
ISSN:	0008-6223
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Popis
Shrnutí:	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.
Bibliografia:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0008-6223
DOI:	10.1016/j.carbon.2011.08.047