Abstract
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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