Enhanced low-temperature NH 3 -SCR performance of Ce/TiO 2 modified by Ho catalyst

Holmium was used as a dopant to boost the low-temperature NH 3 -selective catalytic reduction (SCR) performance of Ce/TiO 2 catalyst. It was ascertained that certain amount of Ho-doping species could exceedingly improve the low-temperature SCR activity under 60 000 h −1 of Ce/TiO 2 , accompanied with the improvement of tolerance to H 2 O and SO 2 at 200°C. Characterization results manifested that Ho modification could not only result in inhibiting the growth of TiO 2 crystals and the enlargement of specific surface area but also lead to the enhanced redox ability and the increased amount of surface-adsorbed substances, all of which could promote the low-temperature NH 3 -SCR performance of Ce/TiO 2 .