✦ LIBER ✦

The high temperature pyrolysis of ethylbenzene: Evidence for dissociation to benzyl and methyl radicals

✍ Scribed by L. J. Mizerka; J. H. Kiefer

Publisher: John Wiley and Sons
Year: 1986
Tongue: English
Weight: 714 KB
Volume: 18
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550180309

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✦ Synopsis

The pyrolysis of ethylbenzene has been investigated in shock waves with the laser schlieren technique. Mixtures of 1 and 2% ethylbenzene in krypton were studied for reaction conditions of 1300-1800 K, 70-550 torr. At high temperatures, the initial rapid endothermic dissociation is followed by a region of net exothermic reaction, which is readily understood as arising mainly from methyl radical recombination after dissociation to methyl and benzyl radicals. The initial unimolecular dissociation rates show no detectable dependence on pressure; with AH& = 75.7 kcal mo1-l these rates are log k ( X ' ) = 13.49 -SO.O/S An RRKM extrapolation suggests log k,(s-') = (15.95 2 0.3) -(74.7 2 2 ) / S in excellent agreement with previous lower temperature data.

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