Spectroscopic and kinetic study of the premixed acetylene-nitric oxide flame
Premixed fuel rich and stoichiometric acetylene-nitric oxide flames were stabilized on a water-cooled burner of 3.8 cm in diameter at a pressure of 80 mm Hg. In the spectral wavelength from 250-600 nm the flames emit very strong CN, NH, CH, C/sub 2/ and OH bands and weak NO..gamma.. bands. In the burnt gases the blue and yellow continua which are due to the reactions of CO + O and NO + O, respectively, were also observed. Concentration and chemical reaction rate profiles of C/sub 2/, CN, NH and NO indicated that the decomposition of NO in the C/sub 2/H/sub 2/-NO flame tied to the concentration levels of the hydrocarbon radicals formed in the reaction zone: (1) C/sub 2/ + NO ..-->.. CN + CO; (2) CH + NO ..-->.. NH + CO; (3) CN + NO ..-->.. N/sub 2/ + CO; and (4) NH + NO ..-->.. N/sub 2/ + OH. Using the flame data the rate constants k/sub 1/ and k/sub 2/ were estimated to be 3.6x10/sup 14/ and 6.0x10/sup 14/ cm/sup 3/ mole/sup -1/ sec/sup -1/ at 2700/sup 0/K, respectively. The reduction of NO by H, O, OH and N in the burnt gases was discussed based on the calculated equilibrium concentrations of H, O and OH. Acetylene oxidation mechanisms and the formation processes of CH and C2 were also proposed.
- OSTI ID:
- 5998104
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ACETYLENE
COMBUSTION KINETICS
FLAMES
OXIDATION
NITRIC OXIDE
REDUCTION
AIR
EMISSION SPECTROSCOPY
EQUILIBRIUM
INFRARED SPECTRA
LOW PRESSURE
PRESSURE DEPENDENCE
QUANTITY RATIO
REACTION INTERMEDIATES
TEMPERATURE DEPENDENCE
VERY HIGH TEMPERATURE
ALKYNES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
FLUIDS
GASES
HYDROCARBONS
KINETICS
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SPECTRA
SPECTROSCOPY
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry