Pyrolysis of p-xylene and of 4-methylbenzyl radicals
- Univ. Goettingen (Germany). Inst. fuer Physikalische Chemie
The thermal decomposition p-xylene (+ Ar) = 4-methylbenzyl + H (+ Ar) (1) was studied in shock waves between 1,000 and 1,800 K by monitoring UV absorptions of p-xylene and 4-methylbenzyl. A high-pressure limiting rate constant of k{sub 1} = 10{sup 15.7} exp({minus}355 kJ/mol/RT) s{sup {minus}1} was derived. The experiments also allowed measurement of a rate constant k{sub 2} = 10{sup 14.6} exp ({minus}35 kJ/mol/RT) cm{sup 3}/mol s for the secondary reaction H + p-xylene = 4-methylbenzyl + H{sub 2}. Using 4-methylbenzyl iodide as a precursor the decomposition of 4-methylbenzyl was investigated separately, leading to a rate constant of 10{sup 16.0} exp({minus}360 kJ/mol/RT)s{sup {minus}1} over the range 1,200--1,600 K.
- OSTI ID:
- 93235
- Report Number(s):
- CONF-940711--
- Country of Publication:
- United States
- Language:
- English
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