Combined effect of KCl and SO2 on the selective catalytic reduction of NO by NH3 over V2O5/TiO2 catalyst

- At lower K/V ratio, KCl may transform to K2S2O7 during SCR in the presence of SO2.
- K2S2O7 interacts with V2O5 to form a V2O5-K2S2O7 eutectic.
- The eutectic results in a severe poisoning on SCR activity of V2O5/TiO2 catalyst.
- The eutectic decreases NH3 adsorption and weakens oxidability of the catalyst.