Kinetic investigation of the reactions of NCO radicals with alkanes in the temperature range 294 to 1,113 K
- 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
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ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
03 NATURAL GAS
ETHANE
COMBUSTION KINETICS
METHANE
PROPANE
ACTIVATION ENERGY
AIR POLLUTION CONTROL
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
DIAGNOSTIC TECHNIQUES
FUELS
ISOCYANATES
NITROGEN COMPOUNDS
NITROGEN OXIDES
ALKANES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CONTROL
ENERGY
HYDROCARBONS
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OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
REACTION KINETICS
YIELDS
400800* - Combustion
Pyrolysis
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