Thermal Decomposition of Hydrogen Sulphide by Cadmium Chalcogens

Abstract

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 • 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 • 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.

A review on hydrogen production from hydrogen sulphide by chemical and photochemical methods

“…Semiconductors like cadmium chalcogens (CdS, CdSe and CdTe) were used as catalyst for thermal dissociation by Maloka et al (2006) in the temperature range (548-798) K. These catalysts are also susceptible to photoactivation at room temperature, as it will be more extensively discussed in the next chapter.…”

H2Generation from H2O and H2S through an Iodine Cycle

“…There are many potential methods that could produce H 2 from H 2 S. These include direct and catalyzed , thermal decomposition. These thermal decomposition methods scale well but require high temperatures and thus high energy costs to produce significant amounts of hydrogen.…”

“…6 H 2 S is also a major product of most oil hydrodesulfurization processes, created as H 2 reacts with sulfurcontaining hydrocarbons over a catalyst such as NiMo/Al 2 O 3 or CoMo/Al 2 O 3 . 2 There are many potential methods that could produce H 2 from H 2 S. These include direct 7 and catalyzed 8,9 thermal decomposition. These thermal decomposition methods scale well but require high temperatures and thus high energy costs to produce significant amounts of hydrogen.…”