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Influence of Antimony-Halogen Additives on Flame Propagation.
Valeri I Babushok1, Peter Deglmann2, Roland Krämer3
1Engineering Laboratory, National Institute of Standards and Technology; Gaithersburg, MD, USA.
Combustion Science and Technology : CST
|January 31, 2017
Summary
A new kinetic model shows antimony-halogen compounds effectively inhibit hydrocarbon flames by catalyzing radical recombination. Antimony
Area of Science:
- Chemical kinetics
- Combustion science
- Flame inhibition
Background:
- Flame inhibition is crucial for safety in hydrocarbon combustion.
- Antimony-halogen compounds are potential flame retardants.
- Understanding inhibition mechanisms requires detailed kinetic modeling.
Purpose of the Study:
- To develop a detailed kinetic model for flame inhibition by antimony-halogen compounds.
- To elucidate the catalytic radical recombination cycles of antimony.
- To compare the effectiveness of antimony-based inhibitors.
Main Methods:
- Assembled thermodynamic data from literature and performed calculations for Sb-Br-C-H-O species.
- Utilized flame equilibrium calculations to identify key species.
- Developed a detailed kinetic model and validated it using laminar burning velocity simulations.
Main Results:
- A comprehensive kinetic model for antimony flame inhibition is presented.
- Antimony exhibits a catalytic radical recombination cycle involving Sb, SbO, SbO2, and HOSbO.
- Antimony-based inhibitors are more effective than bromine but less so than CF3Br.
Conclusions:
- The developed kinetic model accurately simulates flame inhibition.
- Antimony's effectiveness stems from its catalytic radical recombination cycle.
- No significant gas-phase synergism was observed between antimony and bromine.
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