The reaction systems CH{sub 3} + OH at intermediate temperatures. Appearance of a new product channel
- DLR, Stuttgart (Germany). Inst. fuer Physikalische Chemie der Verbrennung
In an extension of work at lower temperatures, the title reaction was measured directly in a flow reactor at temperatures up to 700 K and at pressures of 0.65 and 3.25 mbar. OH was used in an excess over CH{sub 3}. Both reactants along with the reaction products were monitored by mass spectrometry. CH{sub 3} profiles served as the major observable quantity for the extraction of rate data by using computer simulation. The fitted total rate coefficients were divided into individual channel rate coefficients by the mass spectrometric measurement of the reaction products. For CH{sub 3} + OH, this led to a rate coefficient, k{sub 1a}, into the stabilization channel, and another one, k{sub le + f}, referring to the sum of two H{sub 2}-eliminating channels yielding the biradical HCOH, and CH{sub 2}O. These latter channels have not been measured before. In order to distinguish between them, the authors switched from OH to OD so that these channels could be determined by their byproducts, H{sub 2} and HD, respectively. A comparison of the rate coefficients for both systems, i.e., CH{sub 3} + OH and CH{sub 3} + OD, indicates that, within error limits, no significant isotope effect takes place. By including previous measurements along with additional ones at 600 K, to be published elsewhere, the authors arrive at the channel rate coefficients.
- OSTI ID:
- 93220
- Report Number(s):
- CONF-940711-; TRN: IM9537%%263
- Resource Relation:
- Conference: 25. international symposium on combustion, Irvine, CA (United States), 31 Jul - 5 Aug 1994; Other Information: PBD: 1994; Related Information: Is Part Of Twenty-fifth symposium (international) on combustion; PB: 1838 p.
- Country of Publication:
- United States
- Language:
- English
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