Water splitting with the Mn(II)-ferrite–CaO–H2O system at 1273K

Y. Tamaura, N. Hasegawa, M. Kojima, Y. Ueda, H. Amano and M. Tsuji

Energy, 1998, vol. 23, issue 10, 879-886

Abstract: Water splitting with Mn(II) ferrites (MnFe2O4, Mn0.5Fe2.5O4) and CaO at 1273K has been studied. The process accompanies a phase change and a calcium-manganese oxide (Cax(Fe,Mn)yOz) is formed. For CaO/MnFe2O4 mole ratios above 3, a single phase of Ca3(Fe2.02/3,Mn0.98/3)3O7.02 with crystal structure of the A3M3O8-type was formed for the MnFe2O4 sample [Mn(II)/Fe=1:2]. Associated evolution of H2 (17.8cm3/g) was observed. The chemical composition of the solid produced shows that the H2 comes from oxidation of Mn(II) to the Mn(III) ion. In the Mn0.5Fe2.5O4 sample [Mn(II)/Fe=1:5], the crystal structures of the solid products were assigned to types of Ca3(Fe,Mn)3O8 and Ca2Fe2O5, the chemical compositions of which could not be determined due to the mixed phase. The H2 volume (21.6cm3/g) was nearly the same as for an MnFe2O4 sample. Thus, the H2 evolution reaction for the Mn0.5Fe2.5O4 sample involves oxidation of both Fe(II) and Mn(II) ions in ferrite. H2 evolution due to oxidation of Mn(II) ions in ferrites was confirmed by the fact that the H2 volume increased in the order NiFe2O4≪Ni0.5Mn0.5Fe2O4Date: 1998
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:23:y:1998:i:10:p:879-886

DOI: 10.1016/S0360-5442(98)00030-9

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