Simultaneous Control of Hg/SO_x/NO_x from Coal-Fired Utility Flue Gases with Transition Metal Oxide-Doped Activated Carbon

摘要

This research investigated the effects of V/Mn/Cu oxide modification on the physicochemical properties and Hg/SO_2/NO_x control of activated carbon. After doping with transition metal oxides, the surface area and total pore volume of activated carbon decreased. The surface morphology of activated carbon was similar before and after surface modification. The CuO_x/AC had the greatest Hg° removal of approximately 54.5% at N_2 condition and 98.9% at flue gas condition, respectively, at 150 °C. At 350 °C, the surface-doped activated carbon still showed 26.1-40.8% Hg~0 removal. The MnO_x-doped sample had the lowest SO_2 removal of approximately 12.2% at 350 °C. These results may indicate that MnO_x/AC sample have a smaller SO_2-SO_3 conversion but still have great control potential for Hg~0. The NO removal of raw and metal-doped activated carbon was small under flue gas condition, indicating that adsorption of NO may not be a suitable route for NO control using the tested samples.