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Reduction and removal of SO 2 and NO x from simulated flue gas using iron oxide as catalyst/absorbent
Author(s) -
Clay David T.,
Lynn Scott
Publication year - 1975
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690210306
Subject(s) - flue gas , ferrous , chemistry , catalysis , flue gas desulfurization , iron oxide , sulfur , inorganic chemistry , oxide , sulfide , sulfur dioxide , sulfate , oxygen , hydrogen sulfide , chemical engineering , organic chemistry , engineering
Iron oxide supported on alumina is a promising catalyst/absorbent for use in the simultaneous removal of NO x and SO x 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 N 2 or NH 3 , and SO 2 is removed as ferrous sulfide or sulfate. Regeneration with air produces SO 2 and reforms Fe 2 O 3 . The reduction of SO 2 by CO and H 2 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. H 2 S 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 O 2 were also reduced. Conditions under which oxygen poisons the catalyst were determined.