Add time:08/13/2019         Source:sciencedirect.com

The thermal decomposition p-xylene (+ Ar)→4-methylbenzyl +H (+ Ar) (1) was studied in shockwaves between 1000 and 1800 K by monitoring UV absorptions of p-xylene and 4-methylbenzyl. A high-pressure limiting rate constant of k1 = 1015.7 exp(−355 kJ mol−1/RT) s−1 was derived. The experiments also allowed measurement of a rate constant k2 = 1014.6 exp(−35 kJ mol−1/RT) cm3 mol−1 s−1 for the secondary reaction H + p-xylene→4-methylbenzyl + H2. Using 4-methylbenzyl iodide as a precursor, the decomposition of 4-methylbenzyl was investigated separately, leading to a rate constant of 1016.0 exp(−360 kJ mol−1/RT) s−1 over the range 1200–1600 K.

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