Experimental study of nitric oxide decomposition by reaction with hydrogen. [2400/sup 0/K--4200/sup 0/K]
The high-temperature decomposition kinetics of nitric oxide have been investigated in shock-heated mixtures of NO, H/sub 2/, and either argon or krypton. Initial NO : H/sub 2/ ratios ranged from 1 : 2 to 2 : 1, with the inert diluent making up 90 percent of the test gas in all cases. Two high-speed infrared detectors were used to monitor the infrared emission from nitric oxide and water vapor. Calculations using a seventeen-reaction kinetic model indicate that the rate-limiting reaction for NO decomposition is the reaction of NO with atomic hydrogen, NO + H ..-->.. N + OH. The chemical rate constant for this reaction, k/sub 1/, could be determined accurately by optimizing agreement between calculated and measured emission records for NO and H/sub 2/O. The Arrhenius-type expression which best fits the data from 21 shock tube experiments in the temperature range from 2400 K to 4200 K is k/sub 1/ = 2.22 x 10/sup 14 +- 0.08/ exp(-50.5 +- 0.6/RT) cm/sup 3//mole-sec.
- Research Organization:
- Stanford Univ., CA
- OSTI ID:
- 7107764
- Journal Information:
- Combust. Sci. Technol.; (United States), Journal Name: Combust. Sci. Technol.; (United States) Vol. 15:3-4; ISSN CBSTB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ARGON
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
DECOMPOSITION
ELEMENTS
FLUIDS
HYDROGEN
KINETICS
KRYPTON
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RARE GASES
REACTION KINETICS
SHOCK WAVES
ULTRAHIGH TEMPERATURE
VERY HIGH TEMPERATURE