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Title: Selective catalytic reduction of NO by hydrocarbons in the presence of excess oxygen using Pt/MCM-41 catalysts
Authors: Shen, S.-C. 
Kawi, S. 
Keywords: DeNOx
In situ FTIR
In situ XRD
Issue Date: 25-Sep-2003
Citation: Shen, S.-C., Kawi, S. (2003-09-25). Selective catalytic reduction of NO by hydrocarbons in the presence of excess oxygen using Pt/MCM-41 catalysts. Applied Catalysis B: Environmental 45 (1) : 63-76. ScholarBank@NUS Repository.
Abstract: The selective catalytic reduction of NO by C3H6 and C3H8 in the presence of 5% O2 over 0.5-2% Pt supported on siliceous MCM-41 has been studied in detail. Pt/MCM-41 shows better activity for NO reduction than Pt/SiO2 and Pt/Al 2O3 under the same reaction conditions due to the larger surface area and pore volume of MCM-41. Two types of Pt species having different reduction temperatures (50-200, 350-500°C, respectively) are formed on Pt/MCM-41. The Pt species having lower reduction temperature is suggested to be responsible for the selective reduction of NO. A redox mechanism is used to explain this behavior. In addition to its high stability in the presence of water vapor, Pt/MCM-41 shows high resistance to SO 2 without irreversible deactivation due to its weak interaction with SO2. The activity of Pt/MCM-41 catalyst is found to be improved in the presence of A1 species both in the framework or on the surface of MCM-41 support, possibly due to the improvement of the acidity of Pt/MCM-41 by A1 species. In situ XRD result indicates that the surface A1-species prevent the active Pt from sintering at high temperature, hence improving the thermal stability of Pt/MCM-41. Having additive Ru species, Pt/Ru/Si-MCM-41 is found to widen the reaction window and decrease the selectivity of the conversion of NO to N2O during the SCR of NO; this is an important finding for overcoming the main shortcoming of Pt-based catalyst. © 2003 Elsevier Science B.V. All rights reserved.
Source Title: Applied Catalysis B: Environmental
ISSN: 09263373
DOI: 10.1016/S0926-3373(03)00108-5
Appears in Collections:Staff Publications

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