DEF is sprayed into the exhaust stream by an advanced injection system and then converted into ammonia on a catalyst. In automotive applications SCR delivers ammonia using a urea solution called Diesel Exhaust Fluid (DEF). The chemical reactions used in SCR systems require a constant feed of ammonia gas. SCR technology uses a catalyst system to break down dangerous NOx emissions produced by diesel engines into nitrogen and water. What is Selective Catalytic Reduction (SCR)?
It is stored in a separate tank, typically with a blue filler cap. DEF is not a fuel additive and never comes into contact with diesel. This system is called Selective Catalytic Reduction (SCR) and can be found on 2010 and later model year trucks and many diesel pickups and SUVs. DEF is sprayed into the exhaust stream of diesel vehicles to break down dangerous NOx emissions into harmless nitrogen and water. Frequently Asked Questions Overview What is Diesel Exhaust Fluid (DEF)? What is Selective Catalytic Reduction (SCR)? Diesel Exhaust Fluid (DEF) use Where can I buy Diesel Exhaust Fluid (DEF)? How much Diesel Exhaust Fluid (DEF) will my truck consume? How much can I expect to pay for Diesel Exhaust Fluid (DEF)? What will happen if my truck runs out of Diesel Exhaust Fluid (DEF)? Is there any danger of filling the Diesel Exhaust Fluid (DEF) tank with diesel and what problems will it cause? If I switch Diesel Exhaust Fluid (DEF) suppliers, what should I do with the fluid which remains in bulk storage tanks and do I need to have them cleaned out? Selective Catalytic Reduction (SCR) technology Why are manufacturers using Selective Catalytic Reduction (SCR) to meet the 2010 guidelines? Are there any heavy-duty truck manufacturers that don't use Selective Catalytic Reduction (SCR) technology? How does Selective Catalytic Reduction (SCR) affect a vehicle's performance? What fuel saving can I expect from a truck equipped with Selective Catalytic Reduction (SCR) technology? When was Selective Catalytic Reduction (SCR) technology first used? Diesel Exhaust Fluid (DEF) handling Is Diesel Exhaust Fluid (DEF) corrosive? Do I need to wear protective clothing when filling up the DEF tank? What should I do if a spill DEF? What is the shelf life of Diesel Exhaust Fluid (DEF)? A large part of Diesel Exhaust Fluid (DEF) is de-ionized water, do I have to worry about the tank or other parts of the Selective Catalytic Reduction (SCR) system freezing? Does DEF evaporate, and what happens if it does? What is the difference between agricultural urea and the urea used in Diesel Exhaust Fluid (DEF)? What happens if I ingest Diesel Exhaust Fluid (DEF)? What happens if I inhale Diesel Exhaust Fluid (DEF) fumes?ĭiesel Exhaust Fluid (DEF) is a non-hazardous solution, which is 32.5% urea and 67.5% de-ionized water.
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