Passive Ammonia SCR for Lean SIDI Engines: Modeling Overview

Kushal  Narayanaswamy, General Motors R&D

Co-authors: Wei Li, Paul M. Najt, Chang H. Kim and Kevin L Perry

Passive Ammonia SCR operation is a low-cost promising alternative for lean NOx aftertreatment in SIDI engines. This talk provides an overview of system level analysis as a compliment to experimental testing in the development of a passive SCR based afterteratment system. 

The size and location of the lean NOx aftertreatment device was determined to achieve the best trade-off between engine back-pressure, catalyst warm-up and acceptable thermal aging under high speed/load conditions. In addition, various aftertreatment architecture (SCR type, the order of the catalysts) were efficiently evaluated and screened, requirements for aftertreatment components and exhaust thermal management devices were defined, and promising technologies were recommended for further development and testing.

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