Does a diesel need a catalytic converter?

The task of the catalyst is to reduce the emission of harmful exhaust components, including those emitted by a diesel engine.

For more than 20 years, car manufacturers have been using catalytic converters in the exhaust systems of gasoline engines. Since a catalytic converter is a device that is used to reduce the emission of harmful components into exhaust gases, it is also used in diesel engines. The diesel engine emits soot, hydrocarbons, sulfur dioxide, nitrogen oxides and metals: calcium, magnesium, iron and zinc due to the principle of operation and the fuel used. The widely used oxidation catalyst provides 98 percent sulfur dioxide emissions and more than 80 percent hydrocarbon and carbon monoxide emissions. From 2005, when the Euro IV standard comes into force in the exhaust systems of diesel engines, it will become necessary to install catalysts and a particulate filter, possibly an additional catalyst will be added to neutralize nitrogen oxides.