Abstract
Reactions between steam and metal sulfides such as Ag2S, CaS, and ferrous sulfide were investigated in the temperature range 900–1100 K by monitoring the evolved hydrogen. These reactions are characterized by solid products and can be classified into three types, that is, metal, oxide, and sulfate, respectively. For the reaction of CaS or Ag2S with steam, it was concluded that generation of H2 is due to the oxidation of S2− in the sulfide phase. In ferrous sulfide, the contribution of the oxidation of Fe2+ to the hydrogen evolution is of importance. Furthermore, it was confirmed that selective oxidation of Fe2+ or S2− in the ferrous sulfide proceeds depending upon the extent of nonstoichiometry of ferrous sulfide. It is also shown that the addition of lime to ferrous sulfide results in a considerable increase in hydrogen concentration.
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