[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 CuCl2 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 H2S. 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 CuCl2 increased the oxidation potential of the solution and enabled Fe3+ to efficiently catalyze the oxidation of H2S to produce monomeric S. The synergistic catalytic oxidation between Fe3+/Cu2+ is the main reason why the system can maintain a high degree of purification over a long period. [ABSTRACT FROM AUTHOR]