✦ LIBER ✦

The very-high-temperature pyrolysis of ethane: Evidence against high rates for dissociative recombination reactions of methyl radicals

✍ Scribed by J. H. Kiefer; K. A. Budach

Publisher: John Wiley and Sons
Year: 1984
Tongue: English
Weight: 766 KB
Volume: 16
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550160606

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✦ Synopsis

The pyrolysis of 1 and 2% ethane in krypton has been studied in shock waves by the laser-schlieren technique over 1700-4800 K. For 2400-2800 K an effective zero density gradient is seen following the rapid dissociation of the ethane. Through simulation with various mechanisms it is evident that the high rates for the dissociative recombination reactions of methyl radicals 2CH3 + CzH, + Hz 2CH3 + CZH, + H obtained in recent shock-tube studies, are incompatible with this observation; these rates must be reduced at least an order of magnitude. On the basis of theory and previous low-temperature (TI measurements, k = 7.8 x 10" ( -6 5 6 2 / T ) (cm3/mol s ) is recommended for the second of these reactions.

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