A series of CexZr1-xO2(0 B x B 1)with different molar ratios of Ce/Zr were syhthesized via coprecipitation method,and Fe2O3-WO3/CexZr1-xO2monolithic catalysts were prepared for selective catalytic reduction of nitrogen oxides by ammonia(NH3-SCR).The structural properties and redox behavior of the catalysts were comprehensively characterized by N2physisorption,X-ray diffraction(XRD),X-ray photoelectron spectra(XPS),H2-temperature programmed reduction(H2-TPR)and activity measurement for NH3-SCR.The results showed that the NH3-SCR activities of the catalysts were gradually enhanced by increasing the molar ratios of Ce/Zr,especially the lowtemperature catalytic activity and the reaction temperature window.Fe2O3-WO3/Ce0.68Zr0.32O2monolithic catalyst presented the best NH3-SCR activity among the investigated catalysts,more than 90%NOxcould be removed in the temperature range of 247–454°C on the catalyst under the gas hourly space velocities of 30,000 h-1.And it always held more than 99%N2selectivity and less than 20 ppm(1 ppm=10-6L/L)N2O generation concentration between 200 and500°C,the catalyst also displayed its strong resistance of H2O and SO2.Good textural and structural properties,more surface Fe,Ce and active oxygen were together contributed to the excellent NH3-SCR performance of Fe2O3-WO3/Ce0.68Zr0.32O2catalyst. A series of CexZr1-xO2 (0BxB1) with different molar ratios of Ce / Zr were syhthesized via coprecipitation method, and Fe2O3-WO3 / CexZr1-xO2monolithic catalysts were prepared for selective catalytic reduction of nitrogen oxides by ammonia (NH3- SCR). The structural properties and redox behavior of the catalysts were comprehensively characterized by N2physisorption, X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), H2- -SCR.The results showed that the NH3-SCR activities of the catalysts were gradually enhanced by increasing the molar ratios of Ce / Zr, especially the low temperature catalytic activity and the reaction temperature window. Fe2O3-WO3 / Ce0.68Zr0.32O2monolithic catalyst presented the best NH3-SCR activity among the investigated catalysts, more than 90% NOx can be removed in the temperature range of 247-454 ° C on the catalyst under the gas hourly space velocities of 30,000 h-1.And it always held more than 99 % N2 selectivity and less than 20 ppm (1 ppm = 10-6 L / L) N2O generation concentration between 200 and 500 ° C, the catalyst also displayed its strong resistance of H2O and SO2. Good textural and structural properties, more surface Fe, Ce and active oxygen were together contributed to the excellent NH3-SCR performance of Fe2O3-WO3 / Ce0.68Zr0.32O2catalyst.