Elimination of Hydrogen Sulfide in the Presence of Carbon Dioxide from Methane in Dielectric Barrier Discharge

Plasma-chemical conversion of hydrogen sulfide in the presence of carbon dioxide from methane in the dielectric barrier discharge plasma is studied. The degree of hydrogen sulfide removal reaches 97 vol %. The degree of methane transformation does not exceed 14 vol %. Gaseous reaction products contain hydrogen, carbon oxides, and C-2-C-4 hydrocarbons. The process is accompanied by the formation of deposits on the surface of reactor electrodes. The composition of deposits is studied. Organic linear and cyclic polysulfides, as well as sulfones of various structures are identified in soluble components of deposits. Based on the experimental data and the results of theoretical estimates, a radical chain reaction mechanism is proposed. It is shown that the formation of polysulfide compounds with terminal alkyl and oxygen-containing groups is provided by the reactions between atomic oxygen, SH, and alkyl radical which were formed in the initial stages of processes in the non-equilibrium plasma of dielectric barrier discharge.