Experimental and computational studies of the thermal decomposition of halon 1211

✍ Scribed by Hai Yu; Eric M. Kennedy; Md. Azhar Uddin; Simon P. Sullivan; Bogdan Z. Dlugogorski

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 160 KB
• Volume: 37
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.20055

✦ Synopsis

Abstract

Thermal pyrolysis of halon 1211 (CBrClF~2~), diluted in nitrogen, in a tubular alumina reactor, has been studied over the temperature range of 773–1073 K at residence times from 0.3 to 2 s. At temperatures below 973 K, the major products were CCl~2~F~2~, CBr~2~F~2~, C~2~Cl~2~F~4~, C~2~BrClF~4~, C~2~F~4~, and C~2~Br~2~F~4~. Further increasing temperature resulted in the formation of CBrF~3~, CClF~3~, and many other species whose formation necessitated the rupture of CF bonds. Coke formation was also observed on the surface of the reactor at high temperatures. A kinetic reaction scheme involving 16 species and 25 reaction steps was developed and applied to model the thermal pyrolysis of halon 1211 over the temperature range of 773–973 K. Sensitivity analysis suggests that the reaction CBrClF~2~ + CClF~2~→CCl~2~F~2~ + CBrF~2~ constitutes the major pathway for the decomposition of halon 1211 under the conditions investigated. © 2005 Wiley Periodicals, Inc. Int J Chem Kinet 37: 134–146, 2005