A novel mechanism for poisoning of metal oxide SCR catalysts: base–acid explanation correlated with redox properties

A novel mechanism is proposed for the poisoning effect of acid gases and N2O formation on SCR catalysts involving base–acid properties correlated with redox ability of M–O or M–OH (M = Ce or V) of metal oxides and the strength of their basicity responsible for resistance to HCl and SO2 at medium and low temperatures.