Journal
TOPICS IN CATALYSIS
Volume 56, Issue 9-10, Pages 567-575Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11244-013-0016-3
Keywords
Environmental catalysis; Exhaust after-treatment; Selective catalytic reduction; Ammonia oxidation; Ion-exchange; Incipient wetness impregnation
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Funding
- Swedish Energy Agency
- AB Volvo
- ECAPS AB
- Haldor Topsoe A/S
- Scania CV AB
- Volvo Car Corporation AB
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Fe-ZSM-5 catalysts, prepared by different methods, have been characterized by BET, ICP-AES, XRD, XPS, NH3-TPD and NO-TPD and evaluated for NOx reduction according to standard NH3-SCR, NH3 oxidation and NO oxidation, in absence and presence of water. The presence of water has a significant influence on both the SCR and oxidation reactions. The most active catalyst for NH3-SCR is prepared by ion exchange using FeCl2 as iron precursor. The XPS results indicate that Fe2+ ions are the main active sites for the SCR reactions, while Fe3+ ions are the primarily active sites for oxidation of ammonia.
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