Tag: DEF

AdBlue emulators are devices intended to take over control of the SCR (Selective Catalytic Reduction) system. SCR system is responsible for control of exhaust system on the modern truck, bus or other vehicles. A lot of the vehicles made and used in Europe equipped with diesel engines. Older diesel engines had a simple catalytic converter called DOC (Diesel Oxidation Catalyst). This type of catalytic converter is common for all compression-ignition engines. Diesel oxidation catalytic converter made from ceramic core coated with palladium, platinum and aluminum oxide. These coatings serve as catalysts to oxidize the remains of the hydrocarbons and carbon monoxide in the exhaust gasses with oxygen to form carbon dioxide and water. But at certain conditions diesel engines may produce significant amounts of NOx (Mono-Nitrogen Oxides) emissions. Mono-nitrogen oxides NO and NO2 (nitric oxide and nitrogen dioxide) considered as pollutants and led to the introduction of SCR (Selective Catalytic Reduction) systems.

Selective Catalytic Reduction systems

Selective Catalytic Reduction (SCR) system is a device that has one purpose, to reduce the quantity of Mono-Nitrogen Oxides (NOx) in engine exhaust gasses. While diesel oxidation catalytic converter (DOC) is capable of reducing emissions of hydrocarbons and carbon monoxide, SCR is capable of reducing NOx emissions. SCR catalytic converter core usually made from ceramic (titanium oxide) and coated with oxides of such metals as tungsten, vanadium, molybdenum and other precious or rare metals. Anyway, this type of catalytic converter needs an additional component to perform necessary reduction reaction. The required reduction reaction is only possible by adding a solution of anhydrous ammonia, aqueous ammonia or urea. This additive called DEF (Diesel Exhaust Fluid). The most popular DEF solution on the market is AdBlue.

Selective Catalytic Reduction catalytic converter works by injecting Diesel Exhaust Fluid (DEF) for example AdBlue to the exhaust system. DEF injected before catalytic converter chamber where it mixes with exhaust gasses. Selective Catalytic Reduction System is capable of reducing NOx quantity in exhaust gasses only when the specified temperature reached in catalytic converter chamber. It is important that the temperature will reach 360-450°C otherwise SCR effectiveness is relatively small. Continue reading AdBlue Emulators, SCR systems, and DPF filters – everything you need to know!