Reduction kinetics of iron oxides used for hydrogen production in various gas media
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The paper examines the physicochemical features of the reduction of iron oxides (as multicomponent scale waste) in various gases: H2, CH4, CO, and generator gas containing 33% CO and 67% N2. At the initial stage of reduction, the activity of the gases decreases in the above sequence. It is analyzed how blocking of iron oxide surface with carbon formed in the conversion of methane and carbon monoxide influences the reduction processes. The deposition of carbon in these media is intensified when the reduction degree is higher than 70%. The thermodynamic dependencies of oxide reduction on the ratio of PCO2/Pco partial pressures are given. Noteworthy is high sensitivity of Fe3O4 and FeO reduction to the change in CO2 content.
Keywordsredox cycle reduction mechanism reducing gases iron oxides scale waste
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