Chemical equilibria involved in the oxygen-releasing step of manganese ferrite water-splitting thermochemical cycle

L. Seralessandri, M. Bellusci, C. Alvani, A. La Barbera, F. Padella, F. Varsano

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Abstract

Sodium ferrimanganite carbonatation reaction was investigated at different temperatures/carbon dioxide partial pressures to evaluate the feasibility of the thermochemical water-splitting cycle based on the MnFe2O4/Na2CO3/Na(Mn1/3Fe2/3)O2system. After thermal treatments in selected experimental conditions, the obtained powder samples were investigated by using the X-ray diffraction (XRD) technique and Rietveld analysis. Two different lamellar Na1-xMn1/3Fe2/3O2-δphases were observed together with the expected MnFe2O4/Na2CO3mixture. Different equilibrium regions among sodium-depleted lamellar phases, manganese ferrite and sodium carbonate were found as a function of the different reaction conditions. A hypothesis concerning the regeneration mechanism of the initial compounds is proposed. Chemical equilibrium between stoichiometric and sub-stoichiometric forms of sodium ferrimanganite and sodium carbonate formation/dissociation appears to be essential factors governing the oxygen-releasing step of the manganese ferrite thermochemical cycle. © 2008 Elsevier Inc. All rights reserved.
Original languageEnglish
Pages (from-to)1992 - 1997
Number of pages6
JournalJournal of Solid State Chemistry
Volume181
Issue number8
DOIs
Publication statusPublished - Aug 2008
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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