The poisoning effect of sintering dust on V2O5-WO3/TiO2catalyst for NOxremoval in iron ore sintering flue gas

NO(x)from iron ore sintering flue gas can be removed by selective catalytic reduction (SCR) over V2O5-WO3/TiO2(VWTi) catalyst. In this work, the poisoning effects of K(2)SO(4)and CaSO(4)on the VWTi catalyst were investigated. The SCR activities and physicochemical properties of the fresh and poisoned catalysts were characterized. The results confirmed the deactivation of the poisoned catalysts, and the SCR activity decreased with increasing the concentration of the doped poisoning precursors. This reduced SCR activity could be related to the decreased reducibility of vanadium species and lower content of surface chemisorbed oxygen. Characterization of the poisoned catalysts showed migration of V 2p(3/2)towards lower binding energy, reduced amount of NH(3)desorption, and elimination of V=O stretching vibration bond, which could be attributed to the extension of V=O bond, consequently leading to the formation of -V-O-Ca/K bonds. A possible poisoning mechanism of the VWTi catalyst was proposed and discussed.

Automated summary

In this study, the poisoning effects of K(2)SO(4) and CaSO(4) on VWTi catalyst in the removal of NO(x) from iron ore sintering flue gas were investigated. The results showed that the SCR activity decreased with increasing concentrations of the doped poisoning precursors, which could be attributed to the decreased reducibility of vanadium species and lower content of surface chemisorbed oxygen. Characterization of the poisoned catalysts revealed migration of V 2p(3/2) towards lower binding energy, reduced NH(3) desorption, and elimination of V=O stretching vibration bond.