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- W2009382116 abstract "The mole fractions of CH, CH2, CH3, O, H, OH, O2, and some other species were measured throughout the reaction zones of a series of low-pressure flames burning methane or ethylene in oxygen, diluted by argon. In some flames, the C atom was detected; its ionization potential was found to be 11.1±0.2 eV. For each flame, the total amount of ions produced in unit time was also determined, using the saturation current method. The values for all flames were directly proportional to the corresponding volume integrals ∝[CH][O]dz over the whole reaction zone. It is concluded therefore that the reaction CH+O→CHO++e− is indeed the source of chemi-ions in hydrocarbon flames. The rate constant was found to be 1.7×1011 mole−1 cm3 sec−1 at T=2000–2400°K. The ions are formed in a fairly wide region, extending from about the middle of the visible luminous zone to its outer edge. It is established that CH is not formed directly from CH3; instead, CH is derived from CH2 via CH2+H(OH)→CH+H2(H2O). The rate constants of these reactions were found to be about ten times smaller than the kinetic coefficient of the important CH-removal process CH+H→C+H2, which in turn is some twenty times larger than the rate constant of CH+O2→(products). Evidence has been obtained that the predominant source of CH2 in ethylene flames is the reaction C2H4+O→CH2+CH2O, which is shown to be only a few times slower at T=2000°K than the simultaneous process C2H4+O→CH3+CHO. In methane flames, CH2 is produced from CH3 via the reaction CH3+OH→CH2+H2O; its rate constant is nearly three times less than that of the reaction CH2+O2→(products), which in fuel-lean flames is the major CH2-removal path. The rate constant of the latter reaction was found to be about 1.2×1013 at T≅2000°K." @default.
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- W2009382116 date "1975-01-01" @default.
- W2009382116 modified "2023-09-24" @default.
- W2009382116 title "Production of chemi-ions and formation of CH and CH2 radicals in methane-oxygen and ethylene-oxygen flames" @default.
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- W2009382116 doi "https://doi.org/10.1016/s0082-0784(75)80362-6" @default.
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