The DOC is the first device in the after treatment system. ![]() There are many variances between these systems but the biggest difference between DOC, DPF and SCR filters lies in their individual purposes. Using a combination of physical mechanisms and chemical reactions these systems can, under the right conditions, achieve near complete removal of particulates and harmful gases. The exhaust aftertreatment devices that are applied to vehicles are Diesel Oxidation Catalysts (DOC), Diesel Particulate Filters (DPF) and Selective Catalytic Reduction (SCR) catalysts. Untreated emissions from a diesel engine contains a cocktail of harmful chemicals and particulate matter, however today’s system can reduce this down to harmless substances, oxygen, and water. The diesel exhaust aftertreatment system has arisen to solve one problem the difficult task of removing harmful particulate matter from diesel engine emissions. But why do we have more than one filter in the exhaust system and what are their differences? Differences between DOC, DPF and SCR Filters Further development arose thanks to the necessity to comply with emissions standards, and several techniques to cater to this requirement emerged. In order to achieve their necessary power and performance every facet of each component is in finely tuned balance. ![]() ![]() It has been said that necessity is the mother of invention and modern compression ignition engines are such an example of remarkable engineering.
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