Applied Surface Science, Vol.483, 260-269, 2019
Simultaneous removal of Hg-0 and NO in simulated flue gas on transition metal oxide M ' (M ' = Fe2O3, MnO2, and WO3) doping on V2O5/ZrO2-CeO2 catalysts
The additive effect of different transition metal oxide M' (M'= Fe2O3, MnO2, and WO3) doping on V2O5/ZrO2-CeO2 (V/ZrCe) catalyst with reduced vanadium for simultaneous removal of NO and Hg-0 was investigated. V/ZrCe doped with Fe2O3, MnO2, and WO3 and reduced vanadium were prepared by a wet-impregnation method and tested for their catalytic activity of simultaneous removal of NO and Hg-0 in the temperature range of 100-400 degrees C. A combination of various analytical techniques including SEM, BET, XRD, H-2-TPR and XPS were used to characterize the characteristics of catalysts. Results indicated that the introduction of M' could enhance the catalytic properties of the catalysts. V0.01Mn/ZrCe and V0.01Fe/ZrCe catalyst presented higher activities than the V-0.03/ZrCe catalyst below 250 degrees C, while V0.01W/ZrCe catalyst exhibited a higher performance in the temperature range of 300-400 degrees C. The transition metal oxide M' species exist in a well dispersed state on V-0.01/ZrCe catalysts. Doping the transition metal oxide M' on V-0.01/ZrCe could affect the oxidation state of vanadium oxide and cerium oxide via the reaction of V4++ Ce4+ <-> V5++ Ce3+. Besides, the NO conversion was little impacted by Hg-0, whereas SCR atmosphere has inhibited on Hg-0 oxidation due to the strong competitive adsorption of NH3 with Hg-0. The water and sulfur resistance performance decreased in the order of V0.01W/ZrCe > V0.01Fe/ZrCe > V0.01Mn/ZrCe.