The chemistry of sodium with sulfur in flames
An experimental and analytical program examining sodium/sulfur chemistry has been conducted in a series of fuel rich and lean H{sub 2}/O{sub 2}/N{sub 2} flames, with and without added sulfur, and covering a wide range of temperatures and stoichiometries. Fluorescence measurements of OH and Na downstream profiles and sodium line reversal temperatures provided a broad data base for kinetic modeling. Analysis indicated NaSo{sub 2} to be the only significant sodium/sulfur product formed in the lean flames. Even so, its concentrations remain an extremely small fraction of the total sodium. The more important perturbation of the distribution of sodium over its molecular forms results from the catalytic effect of sulfur on the flame radical concentration levels rather than the formation of additional species. A bond dissociation energy of (Na-SO{sub 2}) = 197 {plus minus} 20 kJ mol{sup {minus}1} is derived assuming a non-planar structure or 210 {plus minus} 20 kJ mol{sup {minus}1} if the molecule is planar. NaOS is dominant in the rich flames, coupled with small contributions from NaSO{sub 2}, NaSH, NaS and NaS{sub 2}. Together, these can constitute from about 10 to 20% of the total flame sodium and do represent in this case an enhancement of molecular formation. Preliminary data in fuel rich C{sub 2}H{sub 2}/O{sub 2}/N{sub 2} flames are consistent with this model. This further illustrates the general insensitivity of alkali chemistry to fuel type. 57 refs., 10 figs., 4 tabs.
- Research Organization:
- California Univ., Santa Barbara, CA (USA). Quantum Inst.
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- FG21-86MC23135
- OSTI ID:
- 5773802
- Report Number(s):
- DOE/MC/23135-2980; ON: DE91002060
- Country of Publication:
- United States
- Language:
- English
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The chemistry of sodium with sulfur in flames
Laser fluorescence studies of the chemical interactions of sodium species with sulfur bearing fuels. Final report, Mar 1979 - Dec 1981
Related Subjects
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALKALI METAL COMPOUNDS
ALKALI METALS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DISSOCIATION ENERGY
DOCUMENT TYPES
DYE LASERS
ELEMENTS
ENERGY
FLAMES
FLUORESCENCE
KINETICS
LASERS
LIQUID LASERS
LUMINESCENCE
METALS
NONMETALS
OXIDATION
OXYGEN COMPOUNDS
PROGRESS REPORT
REACTION KINETICS
SODIUM
SODIUM COMPOUNDS
SODIUM SULFATES
SULFATES
SULFUR
SULFUR COMPOUNDS
TURBINE BLADES
VERY HIGH TEMPERATURE