Journal
CHINESE JOURNAL OF CATALYSIS
Volume 39, Issue 11, Pages 1804-1813Publisher
SCIENCE PRESS
DOI: 10.1016/S1872-2067(18)63129-8
Keywords
NH3-NO/NO2 selective catalytic reduction; CeWTi catalyst; Surface acidity; NH4NO3; Reaction mechanism
Funding
- National Natural Science Foundation of China [51775296, 51375253]
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The CeO2-TiO2 (CeTi) and CeO2/WO3-TiO2 (CeWTi) catalysts were prepared by a sol-gel precipitation method and their NH3-NO/NO2 selective catalytic reduction (SCR) performance was studied. N2O formation and effect of oxygen concentration on SCR performance over CeWTi catalyst were also investigated while varying the NO2/NOx ratio. Results indicate that fast SCR behavior of CeWTi catalyst has the best NH3-NO/NO2 SCR performance due to the catalyst reoxidation rate by NO2 higher than by O-2. Compared with CeTi catalyst, CeWTi catalyst exhibits higher de-NOx performance under NH3-NO/NO2 SCR conditions. As the CeTi and CeWTi catalysts exhibit similar redox property, addition of WO3 provides more acid sites which accelerate the reaction between NH4NO3 and NO to get a superior low-temperature activity. Amount of N2O formation shows a peak at 250 degrees C mainly derived from NH4NO3 decomposition. (C) 2018, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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