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

Hongyan Wang; Baodong Wang; Jiali Zhou; Ge Li; Daojun Zhang; Ziran Ma; Rihua Xiong; Qi Sun; Wayne Qiang Xu

doi:10.1016/j.jenvman.2019.02.118

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

J Environ Manage. 2019 Jun 1:239:17-22. doi: 10.1016/j.jenvman.2019.02.118. Epub 2019 Mar 13.

Authors

Hongyan Wang¹, Baodong Wang², Jiali Zhou¹, Ge Li¹, Daojun Zhang¹, Ziran Ma¹, Rihua Xiong¹, Qi Sun¹, Wayne Qiang Xu¹

Affiliations

¹ National Institute of Clean-and-Low-Carbon Energy (NICE), Beijing, 102209, China.
² National Institute of Clean-and-Low-Carbon Energy (NICE), Beijing, 102209, China. Electronic address: wangbaodong@nicenergy.com.

PMID: 30877969
DOI: 10.1016/j.jenvman.2019.02.118

Abstract

The catalytic performance of Hg⁰ 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 Hg⁰ 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 O₂, NO, SO₂, NH₃ and HCl were explored. It showed all flue gas except NH₃ could promote Hg⁰ 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 Hg⁰ oxidation over Cu/VWTi was discussed.

Keywords: Catalytic oxidation; CuO; Elemental mercury; Incorporation model; SCR.

MeSH terms

Catalysis
Copper
Mercury*
Oxidation-Reduction
Vanadium*

Substances

Vanadium
Copper
Mercury
cupric oxide