C-class diesel engines are equipped as standard with a catalytic converter and an exhaust gas recirculation system. The catalytic converter is located in the exhaust system in the front exhaust pipe instead of an additional muffler.
Catalyst housing (1), as well as tubular connections are made of high quality steel. The noble metal layer deposited on the catalyst contributes to the additional oxidation of the exhaust gases. Shock sensitive monolith (3) fixed with a metal cloth (2).
In a diesel engine, a so-called oxidation catalyst is used. This catalyst oxidizes carbon monoxide (SO) and hydrocarbons (NS) to the water (H2O) and carbon dioxide (CO2), harmless to the environment.
When the exhaust gases are recirculated, part of them again enters the combustion chamber. This reduces the combustion temperature, which leads to less formation of nitric oxide (NOx).