Removal of NO and Hg-0 simultaneously was achieved on Nb-modified MnTiOx catalyst. Experimental results revealed that high NO conversion (>95%) and Hg-0 oxidation (>95%) in 200-300 degrees C were available on Mn0.15Nb0.02TiOx catalyst with a GHSV of 108,000 h(-1). The excellent catalytic performance of Mn0.15Nb0.02TiOx catalyst should be originated from its high reducibility and massive surface chemisorbed oxygen species. Moreover, the introduction of Nb into MnTiOx catalyst greatly enhanced its resistance to SO2 and H2O. Neither gaseous Hg-0 nor HgO formed on catalyst surface could affect the NH3-SCR reaction. NO had a promotion effect on Hg-0 oxidation, while NH3 was detrimental to Hg-0 oxidation owing to the inhibited adsorption of Hg-0 by NH3. Under SCR reaction conditions, an inhibition impact on Hg-0 oxidation could be detected, but this negative effect could be avoided by using more catalyst sample. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.