Abstract: Mesoporous ceria-titanium catalysts were synthesized by one pot hydrothermal method and used for selective catalytic reduction (SCR) of NO with nearly complete NO conversion over a wide operating temperature range. The outstanding activity of the ceria-titanium catalyst was attributed to the tunable particle size and the efficient control of surface areas and pore volume in the range of 260-400 degrees C by the modulation of the soft template content. Especially, ceria oxide (CeO₂) active centers being highly dispersed and titanium oxide (TiO₂) with sufficient surface areas and uniform pore canals are the main reasons for the excellent SCR performance. For a series of catalysts, H-Ce_0.2TiO_x-2 exhibited nearly complete NO conversion (99%) in the range of 260 degrees C to 400 degrees C, with excellent stability and desired resistance to H₂O. In addition, we discussed the reaction and deactivation mechanisms of ceria-titanium catalysts for the SCR, resulting from better redox ability and abundant acid sites. In view of the simple process and outstanding stability of mesoporous ceria-titanium catalysts, this could be treated as an ideal candidate for real applications.

KeyWords Plus:LOW-TEMPERATURE; CARBON NANOTUBES; CE/TIO2 CATALYST; NH3; AMMONIA; CEO2; OXIDATION; OXIDE; SPECTROSCOPY; PERFORMANCE

Published in RSC ADVANCES, 6 (80):10.1039/c6ra17840e 2016