Combined SO sub x /NO sub x removal and concentration from flue gas through an electrochemical membrane
Electrochemical membrane removal of SO{sub 2} from flue gas and concentration into a salable by-product stream has been achieved. Full-cell tests have verified both the concept and choice of materials compatible with the process gas. Electrodes have been developed, manufactured from a conducting ceramic, La{sub 0.8}Sr{sub 0.2}CoO{sub 3}. Electrochemical cell reactions conform precisely with those discerned in free electrolyte. These reactions are stoichiometric to over 95% SO{sub 2} removal. Oleum by-product generation is likewise totally stoichiometric (100% current efficiency). NO{sub x} removal has been found to occur at the oxidizing electrode. Cell polarization, that is, the achievable current densities at reasonable voltage, is unacceptable with the membranes tested thus far. Future work will focus on identifying a ceramic matrix material and a membrane fabrication technique which yields a membrane with the proper capillarity match with the porous electrodes. This will give the cell the proper polarization performance to permit larger scale endurance tests. 56 figs.
- Research Organization:
- Georgia Inst. of Tech., Atlanta, GA (USA)
- Sponsoring Organization:
- DOE/FE
- DOE Contract Number:
- AC22-87PC79854
- OSTI ID:
- 5103047
- Report Number(s):
- DOE/PC/79854-T1; ON: DE90005310
- Country of Publication:
- United States
- Language:
- English
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(Combined SO sub x , NO sub x removal and concentration from flue gas through an electrochemical membrane)
(Combined SO sub x , NO sub x removal and concentration from flue gas through an electrochemical membrane)
Related Subjects
01 COAL, LIGNITE, AND PEAT
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
NITROGEN OXIDES
REMOVAL
SULFUR OXIDES
CATALYSTS
COBALT COMPOUNDS
ELECTROCHEMISTRY
ELECTRODES
ELECTROLYTES
FLUE GAS
LANTHANUM COMPOUNDS
MEMBRANES
OXIDATION
OXIDES
PERFORMANCE
PEROVSKITES
POLARIZATION
PROGRESS REPORT
STRONTIUM COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
DOCUMENT TYPES
GASEOUS WASTES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WASTES
200202* - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions
010800 - Coal
Lignite
& Peat- Waste Management
400400 - Electrochemistry