Abstract
AbstractIron oxide supported on alumina is a promising catalyst/absorbent for use in the simultaneous removal of NOx and SOx from power plant stack gases. A dry‐contacting process is under development which would operate under net reducing conditions at temperatures of 370° to 540°C. Iron oxide is converted to the ferrous state, NO is reduced to N2 or NH3, and SO2 is removed as ferrous sulfide or sulfate. Regeneration with air produces SO2 and reforms Fe2O3.The reduction of SO2 by CO and H2 was studied in fixed‐bed reactors to determine the effects of temperature and of the other reactive components of flue gas (excepting fly ash) on the rate of reaction and the products formed. H2S and COS react with FeO to form FeS. Under readily attainable conditions, virtually complete removal of sulfur compounds was achieved for gas‐phase residence times of about 1 to 10 ms. NO and O2 were also reduced. Conditions under which oxygen poisons the catalyst were determined.
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