Absolute rate constants for the reaction of OH with NO/sub 2/ in N/sub 2/ and HE from 225 to 389 K
Journal Article
·
· J. Phys. Chem.; (United States)
The temperature dependence of the rate of the reaction OH + NO/sub 2/ + N/sub 2/..-->..HNO/sub 3/ + N/sub 2/ was investigated by using a discharge flow system for OH production and resonance fluorescence for its detection. The reaction was investigated at room temperature in He, and between 225 and 389 K in N/sub 2/. The temperature dependence could be fit by the Arrhenius expression (1.6 +- 0.4) x 10-/sup 31/ exp )(1560 +- 270)/1.987T) cm/sup 6/ molecule-/sup 2/s-/sup 1/ or preferably by (2.3 +- 0.6) x 10-/sup 30/(T/298)-/sup 2/ /sup 9/ cm/sup 6/ molecule-/sup 2/s-/sup 1/. Earlier data have been used to determine the temperature dependence of the high-pressure limiting rate constant for this reaction. Troe's simplified expression for calculating rate constants in the falloff region was used to compare the appropriateness of different limiting values for the description of the experimentally observed pressure dependence of the rate constant. This reevaluation of the rate data suggest more appropriate values for k/sub 0/ and k/sub infinity/ for use in atmospheric modeling: k/sub 0/ = 2.3 x 10-/sup 30/(T/298)-/sup 2/ /sup 9/ cm/sup 6/ molecule-/sup 2/s-/sup 1/ and k/sub infinity/ = 1.2 x 10-/sup 11/(T/298)-/sup 1/ /sup 6/cm/sup 3/ molecule-/sup 1/s-/sup 1/.
- Research Organization:
- General Motors Research Labs., Warren, MI
- OSTI ID:
- 5075390
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 84:17; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ARRHENIUS EQUATION
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COMPARATIVE EVALUATIONS
ELEMENTS
EQUATIONS
FLUIDS
FLUORESCENCE
GASES
HELIUM
HYDROGEN COMPOUNDS
HYDROXIDES
KINETICS
LOW TEMPERATURE
LUMINESCENCE
MEDIUM TEMPERATURE
NITROGEN
NITROGEN COMPOUNDS
NITROGEN DIOXIDE
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RARE GASES
REACTION KINETICS
RESONANCE FLUORESCENCE
400201* -- Chemical & Physicochemical Properties
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ARRHENIUS EQUATION
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COMPARATIVE EVALUATIONS
ELEMENTS
EQUATIONS
FLUIDS
FLUORESCENCE
GASES
HELIUM
HYDROGEN COMPOUNDS
HYDROXIDES
KINETICS
LOW TEMPERATURE
LUMINESCENCE
MEDIUM TEMPERATURE
NITROGEN
NITROGEN COMPOUNDS
NITROGEN DIOXIDE
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RARE GASES
REACTION KINETICS
RESONANCE FLUORESCENCE