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What happens when you put diesel in the DEF tank? By using Ammonia, the SCR system can target and reduce NOx.Įven though the name suggests so, Urea that we use nowadays is synthetic Precautions The process is called Hydrolysis:Īs you can see there is more Ammonia created for use, but as you can see also, the process releases some CO 2. Isocyanic acid is converted further with the help of the water that got evaporated from before. HNCO is called isocyanic acid and cannot be used in this form in the SCR. NH 3 is Ammonia and is the substance that reacts in the SCR and not Urea. The separation of Urea and Water due to heat, is called thermolysis. It is injected into the exhaust stream, where it’s water evaporates.
5 MPH MAX SERVICE DEF SYSTEM UPDATE
If you have a question not answered below, please leave a comment below and ask your question, I’lll be sure to update this article! DEF definition and propertiesĭiesel Exhaust Fluid or DEF for short, is a mixture of 32.5% Urea (for the ones that like chemistry: (NH2)2CO) and 67.5% de-ionised water. So on to the questions that you guys and gals have been asking. Diesel Exhaust Fluid (DEF) Questions & Answers I know a lot of you will read the above paragraphs and wonder how a Urea-based liquid, is injected at the exhaust system and give water? Keep reading and it will all make sense in a bit.
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The result is remarkable DEF breaks down NOx to H 2O (water), CO 2(Carbon Dioxide) and N 2 (Nitrogen). The solution is injected in the stream of hot exhaust gases and is carried to the SCR catalyst, where it chemically reacts with its surface material and NOx. So what’s in DEF?ĭEF is a solution (or mixture) of 32.5% Urea and 67.5% de-ionised water. Since around 2002, SCR (Selective Catalytic Reduction) systems that use Diesel Exhaust Fluid (DEF) made their appearance in the automotive market. The fight to reduce NOx without the need to redesign the whole engine has intensified. With the current economic climate, companies try to be as efficient as possible on spending their research budget. Both options can cost from a few millions to maybe billions of dollars. Money spent on research to develop a new engine, or modify an existing engine in order to meet the new standards. From an engine manufacturer’s perspective however, this means money. To most of us, numbers mean nothing at all. With every new legislation, the maximum acceptable levels of pollutants change.įor example, when we compare the change of the Nitrogen Oxides (NOx) limits between EPA2007 and EPA2013, it went from 1.2g/hp-hr to 0.2 g/hp-hr. One of the pollutants that interest the legislators particularly, is Nitrogen Oxides (NOx). It is a fact nowadays that diesel emission legislation is becoming stricter and stricter.
5 MPH MAX SERVICE DEF SYSTEM PROFESSIONAL
I have been a professional diesel training instructor for six years, so let me explain what it is and then answer your questions! DEF Overview I’ve seen a ton of questions out there about Diesel Exhaust Fluid, or DEF for short.