Electrochemical abatement of pollutants NO[sub x] and SO[sub x] in combustion exhaust gases employing a solid-oxide electrolyte
The role of oxygen vacancies in the conductivity of ESB was studied using such solidstate techniques as differential thermal analysis and x-ray diffraction. A change in the slope of conductivity vs. reciprocal temperature, at [approximately]600[degrees]C, indicates two different conductivity regions. The above techniques were used to show that the change in slope is due to an order-disorder transition of the oxygen sublattice. At high temperatures, the oxygen sublattice is disordered resulting in a high mobility of oxygen vacancies and a low apparent activation energy. At low temperatures the oxygen sublattice tends to order, with the vacancies aligning in (111) planes. The higher activation energy in this temperature regime is than due to the extra energy required to free a vacancy from the ordered state. Furthermore, a reversible aging phenomenon in the conductivity of ESB was observed. For ESB annealed in this lower temperature region, the conductivity was observed to decay with time as the oxygen sublattice ordered. Heating above transition point will completely reverse this process by disordering the oxygen sublattice, and returning the conductivity to its initial value.
- Research Organization:
- Stanford Univ., CA (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-88PC88914
- OSTI ID:
- 7024273
- Report Number(s):
- DOE/PC/88914-T5; ON: DE93001342
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Technical Report
·
Sat Dec 30 23:00:00 EST 1989
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20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
AIR POLLUTION ABATEMENT
BISMUTH COMPOUNDS
BISMUTH OXIDES
CATALYSTS
CHALCOGENIDES
CHEMISTRY
DATA
DOCUMENT TYPES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROCATALYSTS
ELECTROCHEMISTRY
ELECTROLYTES
EXPERIMENTAL DATA
INFORMATION
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLLUTION ABATEMENT
PROGRESS REPORT
SULFUR COMPOUNDS
SULFUR OXIDES
TEMPERATURE DEPENDENCE
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200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
AIR POLLUTION ABATEMENT
BISMUTH COMPOUNDS
BISMUTH OXIDES
CATALYSTS
CHALCOGENIDES
CHEMISTRY
DATA
DOCUMENT TYPES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROCATALYSTS
ELECTROCHEMISTRY
ELECTROLYTES
EXPERIMENTAL DATA
INFORMATION
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLLUTION ABATEMENT
PROGRESS REPORT
SULFUR COMPOUNDS
SULFUR OXIDES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES