Enhanced low-temperature nh 3 -scr performance of ce/tio 2 modified by ho catalyst

Abstract

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 Hodoping species could exceedingly improve the lowtemperature 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 2008C. 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 .