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Water splitting with Mu(H) ferrites (MnFe204) and CaO (or Na2C03) at 1273K and 873K was studied. For CaOIMnFe204 mole ratios above 3, a single phase of Ca3(Fe2 02/3,MnO98/3h0 7 02 (crystal structure; A3M30 8-type) was formed and H2 (17.8 cm3/g) was evolved. This evolution of H2 comes from the oxidation of Mu(II) to Mn(III) ion. Another endothermic process (~H=250-300 kJ/mol) for the production of H2 has been studied using a solid material mixture of MnFe204 and Na2C03 at 873K. The temperature of 873K is quite lower than those studied so far on the solar furnace reaction (02 releasing step) in the two-step water splitting (1500-2300K). This lower temperature and economical availability of required elements would permit further progress in the direct solar energy absorption! conversion into H2.

nihon ouyou jiki gakkaishi/nihon ōyō jiki gakkaishi

A New Thermochemical Water Splitting Process using Ferrite-CaO (or Na&lt;sub&gt;2&lt;/sub&gt;CO&lt;sub&gt;3&lt;/sub&gt;)-H&lt;sub&gt;2&lt;/sub&gt;O System