Excellent low-temperature NH_3-SCR NO removal performance and enhanced H_2O resistance by Ce addition over the Cu_(0.02)Fe_(0.2)Ce_yTi_(1-y)O_x (y = 0.1, 0.2, 0.3) catalysts

摘要

In the present work, a serial of Cu0.02Fe0.2CeyTi1-yOx catalysts are prepared by sol-gel method and applied for NH3-SCR of NO, meanwhile Cu0.02Fe0.2Ce0.2Ti0.8Ox shows good low-temperature NH3-SCR performance with/without water and an outstanding water resistance. The bulk structure, redox ability, surface acidity and surface species of Cu0.02Fe0.2CeyTi1-yOx are measured and discussed by series of characterization in details to illuminate the reasons for the good low-temperature activity and water resistance. The Ce modification can tune the surface acidic distribution, improve the surface oxygen content and surface oxidation reduction cycle (Ce4+ + Fe2+- Ce3+ + Fe3+), which contribute the good activity. In addition, the effect of water on NH3-SCR performance over Cu0.02Fe0.2TiOx and Cu0.02Fe0.2Ce0.2Ti0.8Ox are investigated emphatically by in situ DRIFTS. (C) 2019 Elsevier Ltd. All rights reserved.