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- W2019450622 abstract "The reactions of phenyl radicals with molecular and atomic oxygen have been studied in the temperature range 900–1800 K behind reflected shocks. The total pressure ranged from 1.3 to 2.5 bar. Phenyl radicals were generated by the fast thermal decomposition of nitroso- or iodobenzene. Resonance absorption was used to record the temporal concentration profiles of H, O, and I atoms and of CO molecules. This sensitive technique allowed study of the reaction systems under favorable conditions by applying very low initial concentrations (0.5–250 ppm). Due to the complexity of the system, it was necessary to study in a separate series of experiments the dissociation reactions of intermediates like phenoxy radicals and p-quinone. For the initiation reaction C6H5+O2, two product channels were found: C6H5+O2→C6H5O+O (R1) and a fast channel, producing H-atoms, C6H5+O2→C6H4O2+H (R2) with a branching ratio k1/k2 of about 3 in the investigated temperature range. Reaction (R2) seems plausible; however, it presently has the status of a working hypothesis. ForC6H5+O→C5H5+CO (R5) a rate constant of about 1014 cm3 mol−1 s−1 was deduced. From the evaluated data, a reaction scheme for phenyl radicals is given, which is expected to improvethe modeling results of practical flames containing benzene or other aromatics." @default.
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- W2019450622 title "High-temperature reactions of phenyl oxidation" @default.
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