(573d) Simultaneous Removal of NOx and Gas-Phase Mercury Using Ceria-Titania Materials

Mercury capture using metal oxides and selective catalytic reduction (SCR) catalysts has been studied. Titania-supported manganese oxide was previously found to have an elemental mercury uptake of more than 50 mg/g in fixed-bed adsorption tests using a nitrogen environment at 175°C. The current study shows that manganese dioxide supported on ceria-titania can be used for vapor phase elemental mercury capture from nitrogen at 160 to 200°C; mercury capacities ranged from 4 to 54 mg Hg⁰/g adsorbent depending on the specific gas composition and temperature. It was also found that manganese dioxide supported on ceria-titania showed quantitative NOx reduction using NH₃ as reductant at a reaction temperature below 200ºC. Most significantly, it was found that manganese dioxide supported on ceria-titania can remove elemental mercury and NOx simultaneously at 175°C in a fixed-bed system.