S. Bauerle et al., RECOMBINATION AND DECOMPOSITION OF METHYLENE RADICALS AT HIGH-TEMPERATURES, Berichte der Bunsengesellschaft fur Physikalische Chemie, 99(6), 1995, pp. 870-879
Citations number
25
Categorie Soggetti
Chemistry Physical
Journal title
Berichte der Bunsengesellschaft fur Physikalische Chemie
Recombination and decomposition of methylene radicals have been invest
igated over a wide range of experimental conditions. It has been found
that H atom forming channels play only a minor role in the reactions
investigated. The rate constants for the recombination channels CH2 CH2 --> C2H2 + H-2 (1a) and C2H2 + 2H (1b) have been determined to be
k(1a) = 10(15.2) (+/-) (0.2.)exp (-(50 +/- 5) kJ mol(-1)/RT) cm(3) mol
(-1) s(-1) k(1b) = 10(14.3) (+/-) (0.2.)exp (-(46 +/- 5) kJ mol(-1)/RT
) cm(3) mol(-1) s(-1) in the temperature range from 1100-2700 K. The H
atom channel in the decomposition of methylene in argon leading to CH
+H (2b) has been found to be k(2b) = 10(15.75+/-0.15.)exp((-375 +/- 15
) kJ mol(-1)/RT) cm(3) mol(-1) s(-1) at temperatures between 1900-2700
K. A comparison with literature data available for channel (2a) leadi
ng to C+H-2 shows that the contribution of the H atom channel (2b) in
the decomposition reaction of CH2 is around 10-15%. The energy of acti
vation is in good agreement with the theoretically calculated value.