SYNGAS PRODUCTION VIA HIGH-TEMPERATURE COELECTROLYSIS OF STEAM AND CARBON DIOXIDE
Journal Article
·
· Journal of Fuel Cell Science and Technology
OSTI ID:945402
This paper presents results of recent experiments on simultaneous high-temperature electrolysis (coelectrolysis) of steam and carbon dioxide using solid-oxide electrolysis cells. Coelectrolysis is complicated by the fact that the reverse shift reaction occurs concurrently with the electrolytic reduction reactions. All reactions must be properly accounted for when evaluating results. Electrochemical performance of the button cells and stacks were evaluated over a range of temperatures, compositions, and flow rates. The apparatus used for these tests is heavily instrumented, with precision mass-flow controllers, on-line dewpoint and CO2 sensors, and numerous pressure and temperature measurement stations. It also includes a gas chromatograph for analyzing outlet gas compositions. Comparisons of measured compositions to predictions obtained from a chemical equilibrium coelectrolysis model are presented, along with corresponding polarization curves. Results indicate excellent agreement between predicted and measured outlet compositions. Cell area-specific resistance values were found to be similar for steam electrolysis and coelectrolysis. Coelectrolysis significantly increases the yield of syngas over the reverse water gas shift reaction equilibrium composition. The process appears to be a promising technique for large-scale syngas production.
- Research Organization:
- Idaho National Laboratory (INL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC07-99ID13727
- OSTI ID:
- 945402
- Report Number(s):
- INL/JOU-08-13747
- Journal Information:
- Journal of Fuel Cell Science and Technology, Journal Name: Journal of Fuel Cell Science and Technology Journal Issue: 1 Vol. 6; ISSN 1550-624X
- Country of Publication:
- United States
- Language:
- English
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