CuO modified vanadium-based SCR catalysts for Hg0 oxidation and NO reduction

Abstract The catalytic performance of Hg 0 oxidation over vanadium-based SCR catalysts modified by different addition amounts of CuO was investigated. All catalysts were prepared by impregnation method and characterized. The 7% Cu/VWTi exhibited high Hg 0 oxidation as well as a desired NO removal efficiency at 280–360 °C. The characterization revealed the enhancement of redox properties and well-dispersed active species results in the high catalytic performance after modification. The incorporation model showed that CuO in 7% Cu/VWTi was present in the monolayer dispersion, leading to the highest performance. Moreover, the effects of O 2 , NO, SO 2 , NH 3 and HCl were explored. It showed all flue gas except NH 3 could promote Hg 0 oxidation. Fortunately, the inhibiting effect of NH 3 could be scavenged if the catalyst is installed at the downstream of the SCR reactor. In addition, the mechanism of Hg 0 oxidation over Cu/VWTi was discussed.