Co-oxidation of elemental mercury(Hg0)in selective catalytic reduction(SCR)unite to water soluble oxidized species(Hg2+)followed by co-removal in flue gas desulphurization scrubbers is a promising method to reduce Hg0 from coal-derived power plants.In this work,CuO-CeO2/TiO2(CuCeTi)catalyst synthesized by a sol-gel method was employed for simultaneous removal of NO and Hg0 at low flue gas temperature(150-250 °C)on a laboratory-scale fixed-bed reactor.The catalysts were characterized by Brunauer-Emmett-Teller(BET)surface area analysis,X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS).The interaction between CuO and CeO2 led to a better dispersion of active copper species and more chemisorbed oxygen on catalyst surface.Obvious synergy effect on Hg0 oxidation and NO reduction was achieved when CuO and CeO2 were combined together.Under SCR atmosphere([Hg0] = 75 μg?m-3,[NO] = [NH3] = 1000 ppm,[O2] = 4 vol.%),98%of Hg0 was oxidized at 200 °C with more than 90%of NO was reduced simultaneously.For the CuCeTi catalyst,long time Hg0 oxidation had no adverse effect on following NO reduction process,while SCR atmosphere exhibited promotional effect on Hg0 oxidation.The chemisorbed NO can be oxidized to NO2 by active sites,hence improved the heterogeneous Hg0 oxidation.The competitive adsorption between NH3 and Hg0 dramatically hindered Hg0 oxidation on CeO2/TiO2 catalyst,while it was significantly weakened on CuCeTi catalyst.In the absence of gas-phase O2,NH3 consumed surface active oxygen species,and hence limited Hg0 oxidation.However,Hg0 oxidation performance can be recovered when 4 vol.%gas-phase O2 was introduced to the system,as gas-phase O2 replenished the consumed lattice and chemisorbed oxygen.This work reveals a possibility of industrial application of CuCeTi catalyst for effective removal of Hg0 and NO simultaneously at low flue gas temperatures.