کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6679253 | 1427921 | 2015 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Probing the low-temperature chain-branching mechanism of n-butane autoignition chemistry via time-resolved measurements of ketohydroperoxide formation in photolytically initiated n-C4H10 oxidation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Ketohydroperoxide formation in Cl-atom initiated low-temperature (550-700 K) oxidation of n-butane was investigated using a time-of-flight mass spectrometer and either tunable synchrotron radiation or a H2 discharge for photoionization. Experiments were performed at 1-2 atm pressure using a new high-pressure reactor and also at â¼5 Torr pressure for comparison. Direct kinetic observations of ketohydroperoxide formation qualitatively agree with previous atmospheric pressure jet-stirred reactor studies of Battin-Leclerc et al. (Angew. Chem. Int. Ed., 49 (2010) 3169-3172) where the maximum ketohydroperoxide signal was observed near 600 K. Oxidation of partially deuterated n-butanes provided additional information on the QOOH radical intermediates that proceed to form ketohydroperoxides. The photoionization spectrum of the observed ketohydroperoxide is independent of pressure and is the same when using different deuterium substituted n-butanes, suggesting that one ketohydroperoxide isomer dominates in n-butane oxidation. We conclude that 4-hydroperoxy-2-butyl + O2 is the main reaction leading to ketohydroperoxide and 3-hydroperoxybutanal is the sole ketohydroperoxide that is observed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Proceedings of the Combustion Institute - Volume 35, Issue 1, 2015, Pages 291-298
Journal: Proceedings of the Combustion Institute - Volume 35, Issue 1, 2015, Pages 291-298
نویسندگان
A.J. Eskola, O. Welz, J. Zádor, I.O. Antonov, L. Sheps, J.D. Savee, D.L. Osborn, C.A. Taatjes,