LAUSR

To efficiently remove Hg0 or simultaneously remove SO2, NOx, and Hg0, a reproducible Fe3O4/Fe0 catalyst was prepared and first used as the heterogeneous catalyst to activate vaporized H2O2 with a small amount of HCl acting as the additive. The Hg0 removal efficiency of 93.1% was achieved after a series of experiments at 100–170 °C, and the optimal experimental conditions were obtained, where the reaction temperature was 130 °C and H2O2 and HCl concentrations were 1 mol/L and 20 mmol/L, respectively. Meanwhile, the feasibility for the simultaneous removal of SO2, NO, and Hg0 was discussed, and satisfactory efficiencies were reached. The recovery experiments showed that the spent catalysts could be regenerated and used repeatedly by thermal desorption and liquid reduction. According to the characterization results of mercury temperature-programmed desorption, X-ray photoelectron spectroscopy, X-ray diffraction, H2 temperature-programmed reduction, and chemical analysis, the reaction mechanism was speculated...