Simultaneous removal of nitrogen oxides and sulfur oxides from combustion gases
- Longview, WA
- Walnut Creek, CA
A process for the simultaneous removal of sulfur oxides and nitrogen oxides from 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.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- United States of America as represented by United States Energy (Washington, DC)
- Patent Number(s):
- US 3987146
- OSTI ID:
- 862673
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
removal
nitrogen
oxides
sulfur
combustion
gases
process
power
plant
stack
comprising
contacting
supported
iron
oxide
catalyst
absorbent
presence
sufficient
reducing
agent
selected
consisting
carbon
monoxide
hydrogen
mixtures
provide
net
atmosphere
zone
removed
absorption
substantially
sulfide
catalytic
reduction
ammonia
spent
regenerated
oxidation
recycled
dioxide
produced
regeneration
utilized
production
sulfuric
acid
gases comprising
oxide catalyst
nitrogen oxide
simultaneous removal
iron sulfide
sulfur oxide
sulfur oxides
reducing atmosphere
nitrogen oxides
carbon monoxide
sulfuric acid
sulfur dioxide
combustion gases
iron oxide
power plant
reducing agent
combustion gas
stack gases
catalytic reduction
agent selected
comprising contacting
stack gas
plant stack
contacting zone
supported iron
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