Synthesis
Carbonyl sulfide was first described in 1841, but was apparently mischaracterized as a mixture of carbon dioxide and hydrogen sulfide. Carl von Than first characterized the substance in 1867. It forms when carbon monoxide reacts with elemental sulfur. This reaction reverses above 1200 K. A laboratory synthesis entails the reaction potassium thiocyanate and sulfuric acid. The resulting gas contains significant amounts of byproducts and requires purification.
- KSCN + 2 H2SO4 + H2O → KHSO4 + NH4HSO4 + COS
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