6/14/2023 0 Comments Diesel exhaust fluid![]() Identifies for consumers diesel exhaust fluids that meet diesel engine manufacturer requirements.Diesel exhaust fluid marketers that have demonstrated that their products satisfy the requirements of the most recent and applicable edition of ISO 22241, Diesel engines – NOx reduction agent AUS 32, may be licensed to display the API Diesel Exhaust Fluid Certification Mark.ĪPI Diesel Exhaust Fluid Certification has many benefits: The API Diesel Exhaust Fluid (DEF) Certification Program is a voluntary program designed to certify and monitor the quality characteristics of diesel exhaust fluid intended for use in motor vehicles with diesel engines. This standard, published by the International Organization for Standardization (ISO), is intended to ensure that the diesel exhaust fluid used in SCR-equipped cars and trucks provides the purity required by diesel engine manufacturers and the quality to preserve the emissions control system and the environment. For the SCR unit to operate properly, the DEF must meet an exacting purity standard. To meet these requirements, many diesel engine manufacturers use Selective Catalytic Reduction (SCR), an emissions aftertreatment technology that converts nitrogen oxides (NOx) in the diesel-engine exhaust stream into nitrogen and water vapor, two natural components in the air we breathe.ĭiesel exhaust fluid (also referred to as DEF or AUS 32) is injected into the diesel exhaust stream and the heat from the exhaust, the fluid, and a catalyst convert the NOx into the harmless gases.ĭiesel exhaust fluid is a 32.5% solution of technically pure urea in purified water. Environmental Protection Agency (EPA) emissions requirements. Industries, including as a fertilizer in agriculture.Today, cars and trucks and other applications using diesel engines sold in the United States must meet stringent U.S. Urea is a compound of nitrogen that turns to ammonia when heated. It is a carefully blended aqueous urea solution of 32.5% high purity urea and 67.5% deionized water. It is standardised as AUS 32 (aqueous urea solution) in ISO 22241. DEF is used as a consumable in selective catalytic reduction (SCR) in order to lower NO x concentration in the diesel exhaust emissions from diesel engines. The ammonia (NH3) is the desired product which in conjunction to the SCR catalyst, converts the NOx to harmless nitrogen (N2) and water (H2O).ĭEF is the reactant necessary for the functionality of the SCR system. 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. SCR is the aftertreatment technology that treats exhaust gas downstream of the engine. The purpose of the SCR system is to reduce levels of NOx (oxides of nitrogen emitted from engines) that are harmful to our health and the environment. SCR is the leading technology being used to meet 2010 emission regulations. SCR is a technology that uses a urea based diesel exhaust fluid (DEF) and a catalytic converter to significantly reduce oxides of nitrogen (NOx) emissions. What is Selective Catalytic Reduction (SCR)? ![]() Because the fluid is consumed during the system’s normal operation, it requires the vehicles owner to not only monitor the fluids level but also refill it when it’s been used up. Selective catalytic reduction systems use a consumable diesel exhaust fluid (DEF) in conjunction with a catalyst to reduce nitrous oxide (NOx) emissions. 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). Emissions regulations have been on the minds of diesel pickup owners, prospective owners, and professional over-the-road drivers for some time now.
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