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8304676 
Journal Article 
A MnO2-based catalyst with H2O resistance for NH3-SCR: Study of catalytic activity and reactants-H2O competitive adsorption 
Zhang, N; Li, L; Guo, Y; He, J; Wu, Rui; Song, L; Zhang, G; Zhao, J; Wang, D; He, H; , 
2020 
Yes 
Applied Catalysis B: Environmental
ISSN: 0926-3373 
ELSEVIER 
AMSTERDAM 
118860 
WOS:000526110500018 
MnO2 with interlayer Ce3+ cation (Ce-MnO2) was synthesized by ion exchange approach. The Ce-MnO2 exhibited better low-temperature NH3-SCR catalytic activity as compared to Ce0.38Mn0.62O2-CP prepared by co-precipitation. The good performance was due to easy supply of labile oxygen species generated by migration of Ce species in Ce-MnO2 catalyst, which could promote the oxidation of reactants. The special structure of Ce-MnO2 promoted better properties in terms of low-temperature reduction properties, lower element species, adsorption capacity of reactants and surface acid sites, which was beneficial to NH3-SCR at low-temperature. It also showed superior H2O resistance with NOx conversion above 90 % below 150 degrees C. The competitive adsorptions between H2O and reactants over both of Ce-containing catalysts were investigated by in-situ DRIFT and TPD. The results indicated NOx with strong competitive adsorption on Ce-MnO2 surface than H2O. No competitive adsorption between NH3 and H2O over both of Ce-containing catalysts was also observed, different from previous reports.