NOx Storage-Reduction Characteristics of Lean NOx Trap Catalysts Subjected to Simulated Road Aging

Mark  Crocker, University of Kentucky

NOx Storage-Reduction Characteristics of Lean NOx Trap Catalysts Subjected to Simulated Road Aging

Yaying Ji1, Courtney Fisk1, Vence Easterling 1, Mark Crocker1*,
Jae-Soon Choi2, William Partridge2
1 Center for Applied Energy Research, University of Kentucky,
2540 Research Park Drive, Lexington, KY 40511-8479
2 Fuels, Engines, and Emissions Research Center, Oak Ridge National Laboratory,
2360 Cherahala Blvd., Knoxville, TN 37932-1563

Although Lean NOx Trap (LNT) catalyst technology has made significant strides in recent years, the issue of LNT durability remains problematic. Following on from our previous research concerning the effect of ceria addition on LNT performance, in this study we focus on the role of ceria in ameliorating the deterioration of Ba-based LNT catalysts during aging. Indeed, we have observed that spectacular improvements in LNT durability can be achieved through the incorporation of CeO2-ZrO2 into the LNT formulation, and, to a lesser extent, La-stabilized ceria.

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