论文部分内容阅读
An innovative approach to H2S capture has been developed using several metal-based ionic liquids ([Bmim] Cl·CuCl2, [Bmim]Cl·FeCl3, [Bmim]Cl·ZnCl2, [Bmim]Br·CuCl2, and [Bmim]Br·FeCl3) immobilized on the sol-gel derived silica, which is superior to purely viscous ionic liquid with a crucial limit of high temperature, low mass transfer rate, and mass loss. The adsorbents were characterized by the Fourier transform infrared spectrometer, transmission electron microscope, N2 adsorption/desorption, X-ray photoelectron spectroscopy, and thermal analysis techniques. The effects of the metal and halogen in IL, the loading amount of IL, and the adsorption temperature were studied by dynamic adsorption experiments at a gas flow rate of 100 mL/min. The H2S adsorption results have showed that the optimal adsorbent and adsorption temperature are 5％ [Bmim]Cl·CuCl2/silica gel and 20—50 °C, respectively. H2S can be captured and oxidized to elemental sulfur, and [Bmim]Cl·CuCl2/silica gel can be readily regenerated by air. The excellent efficiency of H2S removal may be attributed to the formation of nano-scaled and high-concentration [Bmim]Cl·CuCl2 confined in silica gel, indicating that the immobilization of [Bmim]Cl·CuCl2 on the sol-gel derived silica can be used for H2S removal promisingly.