Reactions of phenoxy radicals in the gas phase
- Univ. Goettingen (Germany). Inst. fuer Physikalische Chemie
The phenoxy radical is one of the key radicals in the oxidation of aromatics and the pyrolysis of partially oxidized aromatic compounds in the gas phase. In the context of the combustion of aromatics, this may be exemplified by the chemical mechanisms--discussed in the literature--for the conversion of fuels to final products in hot reaction zones. The oxidation of the classical aromatic compound, benzene, at high temperature is initiated by a hydrogen atom abstraction via atoms (O,H) and radicals (OH,CH{sub 3}) leading to the phenyl radical C{sub 6}H{sub 5}. At low temperatures, the complex-forming reaction C{sub 6}H{sub 5} + O{sub 2} = C{sub 6}H{sub 5}O{sub 2} is slow, whereas at higher temperatures, the chain reaction C{sub 6}H{sub 5} + O{sub 2} = C{sub 6}H{sub 5}O + O dominates, thus asking for kinetic data on the further reactions of the phenoxy radicals. The objectives of this study are (1) to establish a phenoxy radical source via the reaction of phenol with chlorine atoms for high radical concentrations in the study of product formation in subsequent (radical + atom) reactions, (2) to determine the rate coefficients for the formation reaction of phenoxy radicals, and, for the reactions of phenoxy radicals with hydrogen and oxygen atoms, (3) to ascertain the primary products of the phenoxy radical reactions and to elucidate mechanistic concepts (oxygen- and/or carbon-centered radical).
- OSTI ID:
- 93231
- Report Number(s):
- CONF-940711--
- Country of Publication:
- United States
- Language:
- English
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