[Bmim]FeCl4 Efficient Catalytic Oxidative Removal of H2S by Cu2+ Synergistic Reinforcement

An iron/copper bimetallic catalytic oxidation desulfurization system was constituted by adding N -methyl pyrrolidone (NMP) and CuCl 2 aqueous solution to an iron-based ionic liquid (Fe-IL) for the removal of hydrogen sulfide from industrial gas streams. The desulfurizer and its sulfur products were characterized using Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and X-ray diffraction (XRD). Static desulfurization experiments were conducted to investigate the absorption pattern of the system for H 2 S. The addition of NMP and water effectively reduced the acidity and viscosity of the system and improved the gas-liquid mass transfer efficiency. The introduction of CuCl 2 increased the oxidation potential of the solution and enabled Fe 3+ to efficiently catalyze the oxidation of H 2 S to produce monomeric S. The synergistic catalytic oxidation between Fe 3+ /Cu 2+ is the main reason why the system can maintain a high degree of purification over a long period.