title: Simultaneous removal of NO and Hg0over Ce-Cu modified V2O5/TiO2based commercial SCR catalysts.
abstract: A series of novel Ce-Cu modified V2O5/TiO2based commercial SCR catalysts were prepared via ultrasonic-assisted impregnation method for simultaneous removal of NO and elemental mercury (Hg0). Nitrogen adsorption, X-ray diffraction (XRD), temperature programmed reduction of H2(H2-TPR) and X-ray photoelectron spectroscopy (XPS) were used to characterize the catalysts. 7% Ce-1% Cu/SCR catalyst exhibited the highest NO conversion efficiency (>97%) at 200-400°C, as well as the best Hg0oxidation activity (>75%) at 150-350°C among all the catalysts. The XPS and H2-TPR results indicated that 7% Ce-1% Cu/SCR possess abundant chemisorbed oxygen and good redox ability, which was due to the strong synergy between Ce and Cu in the catalyst. The existence of the redox cycle of Ce4++Cu1+↔Ce3++Cu2+could greatly improve the catalytic activity. 7% Ce-1% Cu/SCR showed higher resistance to SO2and H2O than other catalysts. NO has a promoting effect on Hg0oxidation. The Hg0oxidation activity was inhibited by the injection of NH3, which was due to the competitive adsorption and oxidized mercury could be reduced by ammonia at temperatures greater than 325°C. Therefore, Hg0oxidation could easily occurred at the outlet of SCR catalyst layer due to the consumption of NH3.
authors.affiliation: School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300401, China; College of Environmental Science & Engineering, Nankai University, Tianjin 300350, China.
authors.forename: Guilong
authors.initials: G
authors.lastname: Chi
authors.affiliation: School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300401, China. Electronic address: shenbx@nankai.edu.cn.
authors.forename: Boxiong
authors.initials: B
authors.lastname: Shen
authors.affiliation: School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300401, China.
authors.forename: Ranran
authors.initials: R
authors.lastname: Yu
authors.affiliation: College of Environmental Science & Engineering, Nankai University, Tianjin 300350, China.
authors.forename: Chuan
authors.initials: C
authors.lastname: He
authors.affiliation: College of Environmental Science & Engineering, Nankai University, Tianjin 300350, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Zhang
keywords: Ce and Cu co-modification; Commercial SCR catalyst; Enhancement mechanism; Simultaneous removal of NO and Hg(0)