Flame Synthesis of Carbon Nanotubes Using Low Calorific Value Gases

Camacho, Jorge ; Subramanya, Mahesh ; Choudhuri, Ahsan R.

University of Texas at El Paso

关键词: Acetylene;    Nanostructures;    Flames;    37 Inorganic, Organic, Physical And Analytical Chemistry;    Propane;   

DOI  :  10.2172/924881
RP-ID  :  None
RP-ID  :  FG26-06NT42749
RP-ID  :  924881

美国|英语

来源: UNT Digital Library

【 摘 要 】

Nanostructures formed in diffusion flames of pure fuels [CH{sub 4}, C{sub 3}H{sub 8}, and C{sub 2}H{sub 2}] at different fuel flow rates have been analyzed. Synthesis samples have been also collected from diffusion flames of various fuel blends [H{sub 2}-CH{sub 4}, H{sub 2}-CO, H{sub 2}-C{sub 3}H{sub 8}, H{sub 2}-C{sub 2}H{sub 2}] at different combustion conditions. SEM images of particulate samples collected from H{sub 2}-CH{sub 4} diffusion flames show formation of nanostructures. However, the formation of nanostructures only occurs at a narrow window of fuel compositions (< 10% H{sub 2} concentration in the mixture) and flow conditions (Jet Exit Reynolds number Re{sub j} = 200). At higher H{sub 2} concentration and flow velocity, formation of nanostructures diminishes and H{sub 2}-CH{sub 4} flames produce amorphous carbon and soot particles.