A dual-functional way for regenerating NH3-SCR catalysts while enhancing their poisoning resistance

A new regeneration method was developed for reactivating poisoned commercial catalysts (V2O5-WO3/TiO2) for the NH3-SCR reaction. The proposed regeneration method can wash out poisons in relatively mild conditions, and also in situ enhance their further resistance towards alkali poisons, SO2 and H2O. To the best of our knowledge, no examples of regeneration methods with these dual functions have been reported. Characterization results showed that the new regeneration method reduces the loss of active components and significantly improves the surface acidity, thus enhancing the resistance to poisons in further deNO(x) operation.