chapter  18
48 Pages

The Hybrid Sulfur Cycle

ByMaximilian B. Gorensek, William A. Summers

The Hybrid Sulfur (HyS) cycle (Figure 18.1) is one of the simplest thermochemical watersplitting processes, comprising only two reactions with all reactants and products in the ¦uid state. Known also as the Westinghouse Sulfur or Ispra Mark 11 cycle, it entails coupled reactions that cycle sulfur between its +4 (sulŒte) and +6 (sulfate) oxidation states. One of the two reactions is thermochemical (high-temperature, endothermic) while the other is electrochemical, making it a hybrid thermochemical cycle.