Simultaneous removal of nitrogen oxides and sulfur oxides from combustion gases
Patent
·
OSTI ID:7217180
A process is described for the simultaneous removal of sulfur oxides and nitrogen oxides fom power plant stack gases comprising contacting the stack gases with a supported iron oxide catalyst/absorbent in the presence of sufficient reducing agent selected from the group consisting of carbon monoxide, hydrogen, and mixtures thereof, to provide a net reducing atmosphere in the SO/sub x//NO/sub x/ removal zone. The sulfur oxides are removed by absorption substantially as iron sulfide, and nitrogen oxides are removed by catalytic reduction to nitrogen and ammonia. The spent iron oxide catalyst/absorbent is regenerated by oxidation and is recycled to the contacting zone. Sulfur dioxide is also produced during regeneration and can be utilized in the production of sulfuric acid and/or sulfur.
- Assignee:
- Energy Research and Development Administration
- Patent Number(s):
- US 3987146
- OSTI ID:
- 7217180
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
AIR POLLUTION CONTROL
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
DENITRIFICATION
DESIGN
DESULFURIZATION
EQUIPMENT
FLUE GAS
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
IRON COMPOUNDS
IRON OXIDES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OPERATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
REMOVAL
SULFUR COMPOUNDS
SULFUR OXIDES
THERMAL POWER PLANTS
TRANSITION ELEMENT COMPOUNDS
WASTES
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
AIR POLLUTION CONTROL
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
DENITRIFICATION
DESIGN
DESULFURIZATION
EQUIPMENT
FLUE GAS
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
IRON COMPOUNDS
IRON OXIDES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OPERATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
REMOVAL
SULFUR COMPOUNDS
SULFUR OXIDES
THERMAL POWER PLANTS
TRANSITION ELEMENT COMPOUNDS
WASTES