SCR works by first routing exhaust gases through an oxidation catalyst, which removes hydrocarbons and converts a small amount of NOx to NO2. Exhaust fluid is converted into ammonia, which reacts with the remaining NOx in the SCR catalyst to produce harmless nitrogen and water.
What does diesel exhaust fluid do?
In 2010, the EPA required diesel engines to reduce their production of (NOx) nitrogen oxides. That reduction is accomplished with the additive Diesel Exhaust Fluid (DEF). This fluid reduces NOx and air pollution. So it helps heavy machinery and trucks operate within the federal emissions guidelines.
Is DEF fluid made from urine?
The Bottom Line on Urine and DEF Diesel exhaust fluid is not made of urine, and if you are going to urinate in your SCR system, you’re looking at having to pay some pretty hefty repair costs to clean and replace engine components once they have been contaminated.
How long does DEF fluid last?
about two years
Diesel exhaust fluid normally has a shelf life of about two years. However, exposure to sunlight or sustained high temperatures can compromise it.
What is blue DEF used for?
BlueDEF® Diesel Exhaust Fluid is a mixture of high purity synthetic urea and deionized water that is used in Selective Catalytic Reduction (SCR) systems in diesel vehicles. DEF is used to help convert NOx to harmless nitrogen and water.
What happens if DEF gets in diesel?
What Happens If I Put Diesel into a DEF Tank? Diesel is less dense than DEF, so it will float on the DEF. If it enters the SCR catalyst, significant damage can occur that may require servicing or even worse, a (costly) replacement of the catalyst.
What is the urea in DEF?
Specifically, DEF is an aqueous urea solution made with 32.5% urea and 67.5% deionized water. DEF is consumed in selective catalytic reduction (SCR) that lowers the concentration of nitrogen oxides (NO.
What kind of urea is used in DEF fluid?
DEF and AdBlue are an aqueous urea solution 32 (AUS 32), a clear 32.5% nitrogen solution of high-purity urea in demineralized water. The urea solutions are safe to handle, manufacturers claim. AdBlue can be bought in bulk in Europe or by the liter at some service stations.
How do I know when my DEF tank is full?
When DEF runs out entirely, the light turns red, and the truck is electronically limited from going more than five mph. DEF levels can also be checked manually. The storage tank can typically be found next to the diesel fuel saddle tank on a truck, or in the spare tire area of a passenger vehicle.
How a DEF system works?
Inside the exhaust pipe, the DEF vaporizes and decomposes into ammonia and carbon dioxide. Those two compounds then react with oxygen and detrimental nitrogen oxides inside the vehicle’s selective catalytic reduction (SCR) catalyst. This produces three benign tailpipe gases: nitrogen, water vapor, and carbon dioxide.
What year trucks require Def?
What Year Chevrolet and GMC Trucks Require DEF? In 2007, Duramax produced a 6.6L engine with new diesel particulate filter technology. However they didn’t start using DEF until 2010 in response to 2010 EPA regulations. In 2011 General Motors released the latest in its Duramax line, labeled the LML. This version introduced advanced emission controls, including diesel exhaust fluid injection.
What is the purpose of diesel exhaust fluid?
Diesel exhaust fluid, or DEF, is designed for use in SCR systems to reduce nitrogen oxide emissions. It is a urea-based chemical produced from raw fossil fuel sources such as natural gas, coal, and a variety of other petroleum based products by dissolving solid urea of high purity in de-ionized water.
Is diesel exhaust fluid dangerous?
Diesel Exhaust Fluid (DEF) is not toxic, harmful or dangerous. In fact, of all the fluids used in a truck, such as diesel, engine oil, brake fluid, antifreeze and windscreen wash, DEF is the least hazardous.
What is diesel exhaust fluid used for?
Diesel Exhaust Fluid. Diesel Exhaust Fluid is used in Selective Catalytic Reduction to change smog-forming nitrogen oxides into mild nitrogen and aquatic vapour. Nitrogen oxide (NOx) is a main contaminant that adds to pollution and can cause asthma, respiratory and heart illnesses.
