Thermal decomposition of hydrogen sulphide by cadmium chalcogens

In this paper, the thermal decomposition of hydrogen sulphide by Cadmium Chalcogens (CdS, CdSe, and CdTe) to hydrogen and sulphur was studied in the temperature range 275-525 degrees C. The thermal dissociation of hydrogen sulphide process efficiency by these semiconductors, under similar conditions, depended on the type of semiconductor and followed the following trend: CdSe >= CdTe > CdS. The experiment also showed that H-2 S is stable at temperatures below 275 degrees C in the presence of these semiconductors. It is found that the molar percentage of H-2 produced is increased with reaction time increased up to 120 min, and reaches a plateau value for longer reaction times.