H2S removal by peroxo heteropoly compound/ionic liquid solution

In this work, five peroxo heteropoly compounds (PHPCs) were synthesized and dissolved in four ionic liquids (ILs) to remove H2S. The Fourier transform infrared (FT-IR) spectrum, Raman spectrum, elemental analysis, Nuclear Magnetic Resonance (NMR) and X-Ray Diffraction (XRD) have demonstrated the successful synthesis of PHPC Besides, the PHPC and IL were characterized by Thermogravimetry analysis (TGA). The desulfurization results showed that cetyltrimethylammonium peroxophosphomolybdate dissolved in 1-N-butyl-3-methylimidazolium bicarbonate has the best H2S removal capacity. Condition optimization experiments showed that a low H2S concentration and high PHPC concentration is in favor of H2S removal. The optimal absorption temperature is 95 degrees C at which the H2S removal efficiency could maintain nearly 100% for 2 h. The desulfurization product has been proved to be sulfur. The regeneration experiment showed that the desulfurization capacity of absorbent is weakened after regeneration because of the loss of peroxide. These results indicate that PHPC/IL solution has the potential to remove H2S. (C) 2017 Elsevier B.V. All rights reserved.