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Titanium-pillared clays(Ti-PILCs)were obtained by different ways from TiCl4,Ti(OC3H7)4 and TiOSO4,respectively.Mn-CeOx/TiPILCs were then prepared and their activities of selective catalytic reduction(SCR)of NO with NH3 at low-temperature were evaluated.Mn-CeOx/Ti-PILCs were characterized by X-ray diffraction,N2 adsorption,Fourier transform infrared spectroscopy,thermal analysis,temperature-programmed desorption of ammonia and H2-temperature-programmed reduction.It was found that Ti-pillar tend to be helpful for the enlargement of surface area,pore volume,acidity and the enhancement of thermal stability for Mn-CeOx/Ti-PILCs.MnCeOx/Ti-PILCs catalysts were active for the SCR of NO.Among three resultant Mn-CeOx/Ti-PILCs,the catalyst from TiOSO4 showed the highest activity with 98％ NO conversion at 220℃,it also exhibited good resistance to H2O and SO2 in flue gas.The catalyst from TiCl4 exhibited the lowest activity due to the unsuccessful pillaring process.