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Simultaneous removal of nitrogen oxides and sulfur oxides from combustion gases

Patent ·
OSTI ID:862673
 [1];  [2]
  1. Longview, WA
  2. Walnut Creek, CA
+ Show Author Affiliations

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
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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/423/
absorbent
absorption
acid
agent
agent selected
ammonia
atmosphere
carbon
carbon monoxide
catalyst
catalytic
catalytic reduction
combustion
combustion gas
combustion gases
comprising
comprising contacting
consisting
contacting
contacting zone
dioxide
gases
gases comprising
hydrogen
iron
iron oxide
iron sulfide
mixtures
monoxide
net
nitrogen
nitrogen oxide
nitrogen oxides
oxidation
oxide
oxide catalyst
oxides
plant
plant stack
power
power plant
presence
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provide
recycled
reducing
reducing agent
reducing atmosphere
reduction
regenerated
regeneration
removal
removed
selected
simultaneous
simultaneous removal
spent
stack
stack gas
stack gases
substantially
sufficient
sulfide
sulfur
sulfur dioxide
sulfur oxide
sulfur oxides
sulfuric
sulfuric acid
supported
supported iron
utilized
zone