Effect of ceria doping on SO2 resistance of Mn/TiO2 for selective catalytic reduction of NO with NH3 at low temperature

Mn/TiO2 and ceria modified Mn/TiO2 were prepared by sol-gel method and used for low-temperature selective catalytic reduction (SCR) of NO with NH3 in the presence of SO2. The deactivation of Mn/TiO2 by SO2 was observed during SCR process and the depositions of (NH4)(2)SO4 and NH4HSO4 were detected on Mn/TiO2 surface. It was found that the resistance to SO2 could be greatly enhanced for Ce modified Mn/TiO2. It was because that the formation of Ti(SO4)(2) and Mn(SO4)(x) was prevented and the depositions of (NH4)(2)SO4 and NH4HSO4 were significantly inhibited with the doping of ceria. (C) 2008 Elsevier B.V. All rights reserved.