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Powder Metallurgy and Metal Ceramics

, Volume 49, Issue 3–4, pp 231–237 | Cite as

Reduction kinetics of iron oxides used for hydrogen production in various gas media

  • V. I. Zenkov
  • V. V. Pasichnyi
Article

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.

Keywords

redox cycle reduction mechanism reducing gases iron oxides scale waste 

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References

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Copyright information

© Springer Science+Business Media, Inc. 2010

Authors and Affiliations

  1. 1.Frantsevich Institute for Problems of Materials ScienceNational Academy of Sciences of UkraineKievUkraine

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