Growth of carbon nanotubes and microfibers over stainless steel mesh by cracking of methane
Autor: | Lizhen Gao, Albert Renken, Lioubov Kiwi-Minsker |
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Rok vydání: | 2008 |
Předmět: |
Materials science
Hydrogen Methane cracking Specific surface area chemistry.chemical_element Carbon nanotube Methane Stainless steel La2NiO4 film law.invention Catalysis chemistry.chemical_compound law Carbon fibers Materials Chemistry Composite material High-resolution transmission electron microscopy Non-blocking I/O Surfaces and Interfaces General Chemistry Condensed Matter Physics Surfaces Coatings and Films Cracking chemistry Chemical engineering |
Zdroj: | Surface and Coatings Technology. 202:3029-3042 |
ISSN: | 0257-8972 |
Popis: | The ${La}_{2}{NiO}_{4}$ film was synthesized on the 304 stainless steel (SS) mesh. The hydrogen reduction of La2NiO4 generated homogeneous nanocatalyst particles (probably ${Ni}/{La}_2{O}_{3}$) over which methane was cracked, producing carbon notubes/microfibers and hydrogen. The carbon nanotubes/microfibers were strongly bonded to the SS mesh. It was observed that the methane conversion always reached its maximum at the cracking temperature of 750 °C regardless of its concentration varying from 5% to 100%. The cracking of 5% methane diluted in nitrogen generated multiwalled carbon nanotubes while the cracking of 10–100% methane resulted in the formation of carbon solid microfibers together with globular carbon particles. Higher concentration of methane created thicker carbon fibers and a 30% concentration of methane resulted in the highest deposits of carbon on the mesh. After a compressed air blow and ultrasonic treatment, the carbon deposits were still strongly adhered to the mesh. As a result of the carbon tubes/fibers coverage, the specific surface area of the SS mesh was enhanced significantly from 0.03 ${m}^{2}/g$ to 21–45 ${m}^{2}/g$. XRD, HRTEM and Raman studies confirmed that the carbon products were of graphitic structure. Such advanced mesh material would have great application potential in industrial catalysis and other areas. |
Databáze: | OpenAIRE |
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