On the use of microkinetic modeling to elucidate NOx conversion pathways in Lean NOx Traps

摘要

Introduction Lean-burn engines provide higher fuel efficiency and lower CO2 emissions compared to gasoline contenders. However, reducing the toxic lean-burn NOx exhaust becomes more delicate task. The nitrogen oxide storage-reduction (NSR) concept is a leading choice of aftertreatment technology capable of meeting severe regulations on mobile source NOx emissions. Numerous studies challenge the detailed description of a NSR operating cycle, and the model catalyst commonly used for elucidating reaction pathways is Pt/Ba/Al2O3 either washcoated in a monolith reactor or powdered in a fixed-bed reactor.