Hydrogen recovery from H2S-CH4 inclusions trapped in quartz triggered by green laser-induced photolysis of polysulphane-sulphur bonds

Add time:08/06/2019    Source:sciencedirect.com

Natural H2S-CH4 inclusions enclosed in quartz were transformed into H2-CH4 mixture with none or negligible H2S concentration after short irradiation of associated sulphur daughter phase with 532 nm photons emitted by a 25 mW Nd-YAG laser. As much as 57 mol. % (73.8 wt %) H2S in the gas inclusions was converted to its constituent elements in sulphur-bearing inclusions. In contrast, the H2S splitting did not occur within the inclusions devoid of the sulphur daughter phase. Raman spectroscopic data and density functional theory-based calculations corroborated the existence and photolytic breakdown of sulphur-bound polysulphanes, which provided accelerated H⋅ radicals capable of breaking the stronger S-H bond in the surrounding molecular H2S at room temperature. The polysulphane-supported photolysis combines benefits of deactivation of the toxic and corrosive H2S pollutant with hydrogen and sulphur recovery, and as such it has a potential of utilizing for the environment-friendly processing and purification of the super-soar natural gas.

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