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

摘要

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 degrees C and the catalytic performance enhanced to 90% at 120 degrees C. The optimal catalyst presented a broad operating temperature window in the range of 60-200 degrees 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. (C) 2016 Elsevier B.V. All rights reserved.