Abstract
Four metal-based low transition temperature mixtures (LTTMs) were synthesized in this work and used for the oxidation of hydrogen sulfide. The LTTMs were prepared from metal chlorides (ZnCl2, FeCl3·6H2O, CrCl3·6H2O and SnCl2·2H2O) and choline chloride (ChCl) with different mixing ratios. The synthesized LTTMs and desulfurization product were characterized using Fourier transform infrared (FT-IR) spectra, Raman spectroscopy, X-Ray Diffraction (XRD) and energy dispersive spectrum (EDS). The results showed that the Fe-based LTTM possesses the highest desulfurization ability. The LTTM of 4Fe/ChCl was identified as the best desulfurizer, and the effect of H2S concentration and temperature was investigated. It was found that a relatively low temperature was in favor of the oxidation of H2S. H2S could be removed excellently by LTTMs within H2S concentration of 1500–2300 mg/m3. The Fe-based LTTMs was proved to have good regeneration performance for at least 4 times. The desulfurization product was determined as sulfur with high purity and good crystal form, and could be recovered easily.
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