Part 1

SELECTIVE CATALYTIC REDUCTION (SCR)• Ammonia and catalyst transformNOx in exhaust into Nitrogen (N)& Water (H 2 O)• A „reductant‟ is added to theexhaust flow to create reaction incatalyst chamber• Liquefied urea is the bestchoice - AdBlue®• Proven in on-highway• Safe, clean, effective, availableSCR is one of the possible Tier 4 Final solutionsCopyright © 2000-2012 Cummins Inc. All rights reserved. Presented at the Shell Technology Forum, October 2012