Cu- and Fe-zeolite SCR catalysts emerged in recent years as the primary candidates for meeting the increasingly stringent lean exhaust emission regulations, due to their outstanding activity and durability characteristics. It is commonly known that Cu-zeolite catalysts possess superior activity to Fe-zeolites, in particular at low temperatures and sub-optimal NO₂/NOx ratios. In this work, we elucidate some underlying mechanistic differences between these two classes of catalysts, first based on their NO oxidation abilities, and then based on the relative properties of the two types of exchanged metal sites. Finally, by using the ammonia coverage-dependent NOx performance, we illustrate that state-of-the-art Fe-zeolites can perform better under certain transient conditions than in steady-state.
Why Cu- and Fe-Zeolite SCR Catalysts Behave Differently At Low Temperatures
Sae Int. J. Fuels Lubr
Sae International Journal of Fuels and Lubricants
SAE 2010 World Congress & Exhibition ; 2010
Sae International Journal of Fuels and Lubricants ; 3 , 1 ; 664-672
2010-04-12
9 pages
Conference paper
English
Why Cu-ceolite and Fe-zeolite SCR catalysts behave differently at low temperatures
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