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In the present work, a serial of Cu 0.02 Fe 0.2 Ce y Ti 1-y O x catalysts are prepared by sol-gel method and applied for NH 3 -SCR of NO, meanwhile Cu 0.02 Fe 0.2 Ce 0.2 Ti 0.8 O x shows good low-temperature NH 3 -SCR performance with/without water and an outstanding water resistance. The bulk structure, redox ability, surface acidity and surface species of Cu 0.02 Fe 0.2 Ce y Ti 1-y O x are measured and discussed by series of characterization in details to illuminate the reasons for the good low-temperature activity and water resistance. The Ce modification can tune the surface acidic distribution, improve the surface oxygen content and surface oxidation reduction cycle (Ce4+ + Fe2+ ↔ Ce3+ + Fe3+), which contribute the good activity. In addition, the effect of water on NH 3 -SCR performance over Cu 0.02 Fe 0.2 TiO x and Cu 0.02 Fe 0·2 Ce 0·2 Ti 0.8 O x are investigated emphatically by in situ DRIFTS. Image 1 • Excellent low-temperature activity for NH 3 -SCR of NO over Cu 0·02 Fe 0·2 Ce 0·2 Ti 0.8 O x. • Ce addition significantly improves the water tolerance for the NH 3 -SCR reaction. • Enhancement of surface acidity for Cu 0·02 Fe 0·2 Ce 0·2 Ti 0.8 O x due to the Ce addition. • Increase in Lewis acid sites contributes the good water tolerance. [ABSTRACT FROM AUTHOR]