382884 Multi-Layer Monolith Catalysts for Lean NOx Reduction

Monday, November 17, 2014: 3:15 PM
M302 (Marriott Marquis Atlanta)
Michael P Harold1, Vemuri Balakotaiah1, Dan Luss1, Sachi Shrestha1, Yang Zheng1, Bijesh M. Shakya1, Pranit S. Metkar1, Yi Liu2, Krishna Kamasamudram2 and Aleksey Yezerets2, (1)Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX, (2)Cummins Inc., Columbus, IN

The challenge of  achieving high NOx conversion and N2 selectivity and minimal release of unreacted NOx and NH3 in lean burn vehicle emission aftertreatment calls for structured catalysts with multiple functions.  We describe experimental and modeling studies of three different multi-layer applications. The first application combines Fe- and Cu-exchanged zeolitic layers to expand the high NOx conversion temperature range.  The second application combines periodic NOx storage and reduction with in situ NH3 generation and selective catalytic reduction.  The third application combines a Pt/Al2O3 bottom layer and a zeolitic toplayer to oxidize NH3 with high selectivity to N2.

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See more of this Session: Development and Applications of Automotive Catalysts II
See more of this Group/Topical: Environmental Division