Study of poisoning mechanism for V2O5/TiO2 catalyst
V2O5/TiO2催化剂中毒机理的试验研究

SCR catalysts affect the NOx removal efficiency and the cost of the whole SCR system, thus playing a pivotal role in SCR technology. This study therefore focuses on V2O5/TiO2 SCR catalysts. The effects of H2O, SO2, and oxides of K, Na, Ca and Pb on the NO conversion of V2O5/TiO2 catalysts were studies. The results showed that the presence of H2O decreased the denitration activity of V2O5/TiO2 catalysts. SO2 promoted the SCR DeNOx reaction of V2O5/TiO2 catalysts to a certain extent, and improved the NO conversion rate. Potassium had the strongest poisoning effect on the catalysts among all four metals in form of either oxides or salts. K2O and Na2O might inhibit the reducing capability of V2O5 on the surface of V2O5/TiO2 catalyst, while CaO and PbO had little effect on the reducing capability of V2O5.