Passive SCR performance under pseudo-transient cycle: challenges and opportunities for meeting Tier 3 emissions

Vitaly  Prikhodko, Oak Ridge National Laboratory

The performance of a passive SCR that included a closed-couple TWC and an underfloor SCR catalysts was evaluated under GM provided 6-mode pseudo-transient cycle.  Engine operating strategies were investigated for NOx control to meet tier 3 emissions regulations.  The presentation discusses challenges and opportunities for meeting Tier 3 NOx+HC and CO emissions, and proposed catalyst system architecture to meet Tier 3 emissions while maximizing fuel savings.

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