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Influence of Different Sulfur Forms on Gas-Phase Mercury Removal by SO2-Impregnated Porous Carbons

Due to widespread global mercury pollution via anthropogenic activities such as coal combustion and its severe toxicity even at low concentrations, it is necessary to remove mercury from power plant flue gas to protect both human and ecosystem. Currently, significant efforts are being made to maximize Hg0 adsorption rates while minimizing the impact on the cost of electricity. The purpose of this study is to explore the influence of different sulfur forms on vapor Hg0 removal by SO2 impregnated porous carbons. After SO2 impregnation, reductive heat-treatment in N2 and H2O2 oxidation process were used to diverge the sulfur form composition in porous carbons. The ultimate and XPS analysis were used to verify the sulfur species. The pore structures of sorbents were determined by nitrogen adsorption/desorption measurements. Then their mercury removal performance was investigated in a fixed-bed reactor, and the influence of different sulfur forms on equilibrium mercury adsorption capacity and mercury desorptio...