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CeO 2 -MoO 3 /TiO 2 catalysts were prepared by three methods: a single step sol-gel (SG), impregnation (IM) and coprecipitation (CP) method. These catalysts were investigated for selective catalytic reduction (SCR) of NO with NH 3 . The results indicate that the catalyst prepared by the SG method possessed the widest temperature window (about 250-475°C), best SCR activity below 450°C and resistance against 10% H 2 O and 1000 ppm SO 2 at a gas hourly space velocity (GHSV) of 90,000 h -1 . According to the results of BET, XRD, XPS, H 2 -TPR and TEM, it is found that larger BET surface area, more highly dispersed active species of Ce and Mo, presence of more Ce 3+ and chemisorbed oxygen, synergistic effect among ceria, molybdenum and titania, and better redox ability can contribute to the better deNO x performance of the CeO 2 -MoO 3 /TiO 2 catalyst prepared by the SG method, compared with those by the IM and CP methods.