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In order to improve the ability of SCR catalyst to catalyze the oxidation of gaseous elemental mercury, a series of novel Ce modified SCR (Selection Catalytic Reduction, V 2 O 5 –WO 3 /TiO 2 ) catalysts were prepared via two-step ultrasonic impregnation method. The performance of Ce/SCR catalysts on Hg 0  oxidation and NO reduction as well as the catalytic mechanism on Hg 0  oxidation was also studied. The XRD, BET measurements and XPS were used to characterize the catalysts. The results showed that the pore volume and pore size of catalyst was reduced by Ce doping, and the specific surface area decreased with the increase of Ce content in catalyst. The performance on Hg 0  oxidation was promoted by the introduction of CeO 2 .Ce 1 /SCR (1%Ce, wt.%) catalyst exhibited the best Hg 0  oxidation activity of 21.2% higher than that of SCR catalyst at 350°C, of which the NO conversion efficiency was also higher at 200–400°C. Furthermore, Ce 1 /SCR showed a better H 2 O resistance but a slightly weaker SO 2  resistance than SCR catalyst. The chemisorbed oxygen and weak absorbed oxygen on the surface of catalyst were increased by the addition of CeO 2 . The chemisorbed oxygen and weak absorbed oxygen on the surface of catalyst were increased by the addition of CeO 2 . The Ce 1 /SCR possed better redox ability compared with SCR catalyst. HCl was the most effective gas responsible for the Hg 0  oxidation, and the redox cycle (V 4+  + Ce 4+  ↔ V 5+  + Ce 3+ ) played an important role in promoting Hg 0  oxidation.

Experimental Research on Mercury Catalytic Oxidation over Ce Modified SCR Catalyst