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High temperature measurements of the rate of the reaction of OH with NH 3
Author(s) -
Zabielski M. F.,
Seery D. J.
Publication year - 1985
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550171105
Subject(s) - chemistry , arrhenius equation , atmospheric temperature range , analytical chemistry (journal) , reaction rate constant , diffusion , reaction rate , thermodynamics , activation energy , kinetics , chromatography , organic chemistry , physics , quantum mechanics , catalysis
Low pressure (4.67 kPa) CH 4 /O 2 /Ar flames were seeded with approximately 5300 ppm NH 3 . The concentration profiles of stable and radical species in lean (ϕ = 0.92) and rich (ϕ = 1.13) flames were determined by molecular beam sampling mass spectrometry. Temperature profiles in these flames were measured with thermocouples whose readings were corrected for radiative losses by the Na‐line reversal method. Regions of the flames were selected where the principal reaction leading to the destruction of NH 3 wasBy correcting the measured concentrations for diffusion, the net rate of NH 3 loss rate was determined in the temperature range 2080–2360 K. The rate constant k 1 was determined from the net loss rate with correction for the reactionusing measured values of (O) and k 2 values given by Salimian, Hanson, and Kruger [1]. The best‐fit Arrhenius expression for k 1 in the temperature range 2080–2360 K is 10 13.88 exp(−4539/ T ) cm 3 /mol‐s. The results of this study combined with previous lower temperature data confirm the non‐Arrhenius behavior of k 1 suggested by Salimian, Hanson, and Kruger [1]. The best‐fit modified three parameter expression for the range 300–2360 K is 10 6.33±0.2 T 2 exp(−169/ T ) cm 3 /mol‐s.