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Title: Kinetic investigation of the reactions of NCO radicals with alkanes in the temperature range 294 to 1,113 K

Conference · · Combustion and Flame; (United States)
OSTI ID:6627681
; ;  [1]
  1. Univ. of Heidelberg (Germany). Physikalisch-Chemisches Inst.

Absolute rate coefficients for the reaction of NCO radicals with methane (k[sub 1]), ethane (k[sub 2]), and propane (k[sub 3]) were measured as a function of temperature in a heatable quartz reactor by means of the laser photolysis/laser-induced fluorescence (LP/LIF) pump-probe technique. NCO radicals were produced by the fast precursor reaction NH(a[sup 1] [Delta]) + HNCO [yields] NH[sub 2] + NCO, following the 193-nm photolysis of isocyanic acid. The measure rate coefficients can be described by the following expressions: k[sub 1](512 < T < 1,113 K) = 10[sup 12.99 [+-] 0.12] [times] exp(-34.0[+-]1.8 kJ/mol/RT) cm[sup 3]/mol s; k[sub 2](296 < T < 922 K) = 10[sup 8.21] [times] (T/298 K)[sup (6.89[+-]0.02)] [times] exp(12.2[+-]0.5 kJ/mol/RT)cm[sup 3]/mol s; and k[sub 3](300 < T < 849 K) = 10[sup 11.49] [times] (T/298 K)[sup (2.15[+-]0.02)] [times] exp(-1.8[+-]0.4 kJ/mol/RT)cm[sup 3]/mol s. A comparison with the corresponding reactions of CN, Cl, and OH radicals with alkanes suggests that all these title reactions also proceed predominantly via a hydrogen atom abstraction mechanism to form HNCO.

OSTI ID:
6627681
Report Number(s):
CONF-940711-; CODEN: CBFMAO
Journal Information:
Combustion and Flame; (United States), Vol. 99:3-4; Conference: 25. international symposium on combustion, Irvine, CA (United States), 31 Jul - 5 Aug 1994; ISSN 0010-2180
Country of Publication:
United States
Language:
English