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

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 degrees 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, SO2, NH3 and HCl were explored. It showed all flue gas except NH3 could promote Hg-0 oxidation. Fortunately, the inhibiting effect of NH3 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.