Resolving N2O formation dynamics during lean/rich cycling of a commercial LNT

Jae-Soon  Choi, Oak Ridge National Laboratory

Jae-Soon Choi, Josh A. Pihl, Todd J. Toops, William P. Partridge (Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA)
Petr Kočí, David Mráček, Šárka Bártová, Miloš Marek (Institute of Chemical Technology, Prague, Czech Republic)

The lean NOx trap (LNT) catalyst is an effective NOx control technology for vehicles powered by lean-burn engines. During NOx reduction over an LNT catalyst, in addition to the desired N2 product, NH3 and N2O can be generated. To facilitate the development of strategies to control these byproducts, it is critical to gain detailed understanding of the reaction mechanisms involved. In contrast to the NH3 chemistry, the mechanisms of N2O formation are not well understood. In this presentation, we will describe our recent investigation of LNT regeneration chemistry with a particular emphasis on N2O formation dynamics based on spatiotemporal resolution of reactions during lean/rich cycling experiments with a commercial LNT catalyst. We believe that the insights can facilitate the development of predictive kinetic models and LNT operating strategies to minimize the emission of this potent greenhouse gas.

Acknowledgements. Research sponsored by the Czech Ministry of Education (Kontakt II project LH 12086) and the U.S. Department of Energy Vehicle Technologies Office.

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