Fullerene formation in acetylene/oxygen/argon/chlorine flames

✍ Scribed by H. Richter; E. De Hoffmann; R. Doome; A. Fonseca; J.-M. Gilles; J.B. Nagy; P.A. Thiry; J. Vandooren; P.J. Van Tiggelen

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 544 KB
• Volume: 34
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(96)00040-1

✦ Synopsis

The impact of Cl, addition on the fullerene formation in acetylene/oxygen/argon flat flames burning at low pressure was investigated. The quantities of C,, and CT0 in the soot were determined by HPLC after extraction with toluene. Negative ion mass spectra were measured using chemical ionization by means of a CH,/N,O mixture. The chlorine containing species were identified by means of a precursor ion mass spectrum. The addition of 25% of Cl, led to a dramatic increase of fullerene formation; soot containing 7.7% of (CsO+C&) was deposited in the combustion chamber. The mass spectra showed signals at the masses of C,,HZ, C,,H, and t&H,, for soot formed in flames with and without chlorine addition while peaks corresponding to the polycyclic aromatic hydrocarbons (PAH) C,,H,,, C&H,, and C24H1a could be observed only without chlorine addition. A positive role of thermally and photochemically unstable chlorinated intermediate species is suggested for the increase of fullerene formation.