Abstract
A series of MnOx modified TiO2 based sorbents were synthesized using wet impregnation method and its performance on elemental mercury (Hg0) removal was studied. The effects of loading amount, calcination temperature, reaction temperature, and flue gas compositions on mercury removal efficiency were investigated. The sorbents were characterized by TGA, N2 adsorption-desorption, XRD, FT-IR, XPS and Hg-TPD. It was shown that the optimum MnOx loading value was 12%, and the optimal calcination and reaction temperature were 450 and 300°C, respectively. The highest mercury removal efficiency of MnOx-TiO2 sorbent was 98.46%. O2 and HCl in flue gas played a positive role in mercury removal. SO2 had a strong inhibitory effect on mercury removal, which may be due to the competition adsorption between SO2 and Hg0. At the same time, the manganese sulfate produced during the reaction covered the surface of the active site, resulting in the decrease in mercury removal efficiency. CO2 and NO in flue gas also slightly inhibited mercury removal. Mn4+ participated in oxidizing Hg0 to Hg2+, accompanied with its reduction to Mn3+. The adsorption and oxidation process of Hg0 over MnOx-TiO2 basically conformed to Mars-Maessen and Langmuir-Hinshelwood mechanism.
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