Short communicationNovel holmium-modified Fe-Mn/TiO2 catalysts with a broad temperature window and high sulfur dioxide tolerance for low-temperature SCR

•A novel highly-efficient holmium-modified Fe-Mn/TiO2 catalyst was developed.•The novel catalyst revealed a broad operating temperature window (60-200 °C).•The novel catalyst exhibited a superior sulfur-poisoning resistance.

Novel highly-efficient low-temperature SCR catalysts were developed through modifying Fe-Mn/TiO2 catalyst with holmium (Ho). It was found that Ho/Ti = 0.1 was the optimal molar ratio for the amount of Ho addition. With this ratio, 85% NOx conversion was obtained at 60 °C and the catalytic performance enhanced to 90% at 120 °C. The optimal catalyst presented a broad operating temperature window in the range of 60-200 °C and exhibited superior sulfur-poisoning resistance, while the further increase of the doped Ho did not have a positive effect on the catalytic performance and structural properties.

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