Promotion of surface acidity and surface species of doped Fe and SO42- over CeO2 catalytic for NH3-SCR reaction

A series of CeO2 modified by Fe species was synthesized via one-pot method and used for selective catalytic reduction (SCR) of NOx by NH3. The characterization revealed that an interaction existed among Fe, sulfates and Ce species. The excellent SCR performance was associated with a remarkable increase in chemisorbed oxygen, the ratio of Ce3+/(Ce4+ + Ce3+) and Fe2+/(Fe3+ +Fe2+). Importantly, the introduction of iron oxides and sulfates into the CeO2 increased the surface acidity and redox property, resulting in the improvement of the SCR performance. Thereby, Fe-2(SO4)(3) modification CeO2 showed the excellent catalytic activity, outstanding stability and superior resistance to H2O + SO2.