Small quantities of diesel exhaust fluid (DEF) are injected into the exhaust upstream of a catalyst, where it vaporizes and decomposes to form ammonia and carbon dioxide. The ammonia (NH3) is the desired product which in conjunction to the SCR catalyst, converts the NOx to harmless nitrogen (N2) and water (H2O).
DEF Failure or What Happens When You Put BAD DEF In A Diesel Truck / Lessons Learned - Duration: 6:20. VAN TREKKING lifestyle 179,951 views
Storage. However, it can corrode some metals and so must be stored and transported carefully. DEF is stored in a tank on board the vehicle, and injected into the exhaust stream by a metering system. The injection rate depends on the specific after-treatment system, but is typically 2–6% of diesel consumption volume.
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Vehicle manufacturers use SCR to meet these standards. DEF is sprayed into the exhaust, breaking down NO x gases into nitrogen and water using an advanced catalyst system. As a result most new diesel trucks, pickups, SUVs, and vans are now fitted with SCR technology and have a DEF tank that must be regularly refilled.
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The treatment is a special fluid (DEF) that must combined with the burned exhaust gasses to form a chemical reaction. This chemical reaction dramatically reduces environmentally harmful pollutants, specifically nitrogen oxide.
All DEF filler caps are blue and the diameter of the opening smaller than of diesel to prevent mis-fueling. DEF tanks generally run from about 3 to as much as 17 gallons in size.
It began with the implementation of exhaust gas recirculation (EGR) systems, then progressed to the diesel particulate filter (DPF), and now the buzz is around selective catalytic reduction (SCR). Selective catalytic reduction systems use a consumable diesel exhaust fluid (DEF) in conjunction with a catalyst to reduce nitrous oxide (NOx) emissions.
The diesel exhaust fluid solution is a component of the Selective Catalytic Reduction system now present on diesel engines. The system The Selective Catalytic Reduction systems lowers the level of nitric oxide and nitrogen dioxide, two gases that are produced during the diesel combustion process.