Rates and Mechanisms of Formaldehyde Pyrolysis and Oxidation,
CALIFORNIA UNIV SAN DIEGO LA JOLLA
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Pyrolysis and oxidation rates of formaldehyde have been measured behind reflected shock waves for 1200 or T, K or 2200 and 1.8 or p, atm or 2.7, in mixtures of CH2OAr and of CH2ON2OCOAr, respectively. Concentrations of CH2O were monitored by absorption of HeXe laser radiation at 3.508 microns, as well as by CH2O emission in the infrared. Emissions from CO2, H2O, and CO-O recombination radiation were monitored in the oxidation experiments CO emission was monitored during pyrolysis. To account for pyrolysis at late times, it was necessary to allow for direct reaction between H2 and CH2O. The 19-step reaction mechanism describes our observed oxidation rates satisfactorily.