SELECTIVE CATALYTIC REDUCTION (SCR) PROCESS
1) Exhaust gases leave turbo outlet and travel through the Diesel Oxidation Catalyst (DOC) canister, where precise amounts of DEF are injected into the exhaust stream
2) DEF quickly vaporizes and converts to ammonia and carbon dioxide (the basic elements of DEF)
3) Exhaust, carbon dioxide and ammonia pass into the SCR chamber
4) In the SCR canister, carbon dioxide is neutralized, and the ammonia catalytically reacts to NOx
5) After the catalytic reaction, the harmless nitrogen vapor and water vapor are released through the exhaust pipe to the atmosphere