In situ DRIFTS of NO + O2 reacted with pre-adsorbed NH3 species (A) and NH3 reacted with pre-adsorbed NOx species (B) at 200 °C on the Ho0.45Ce0.35/TiO2 catalyst. from Enhanced low-temperature NH₃-SCR performance of Ce/TiO₂ modified by Ho catalyst

Holmium was used as a dopant to boost the low-temperature NH₃-SCR performance of Ce/TiO₂ 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/TiO₂, accompanied with the improvement of tolerance to H₂O and SO₂ at 200°C. Characterization results manifested that Ho modification could not only result in inhibiting the growth of TiO₂ crystals and the enlargement of surface specific 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 NH₃-SCR performance of Ce/TiO₂.