Do diesel engines have catalytic converters?

Yes, diesel engines can have catalytic converters. Catalytic converters are devices that use a catalyst to convert harmful pollutants in engine exhaust gas to less harmful pollutants. In diesel engines, catalytic converters are used to reduce the emissions of nitrogen oxides (NOx) and carbon monoxide (CO), as well as particulate matter (PM).

Diesel engines operate at higher temperatures than gasoline engines, so they require different types of catalytic converters. Diesel catalytic converters are typically made of ceramic or metal substrates coated with a catalyst, such as platinum, rhodium, or palladium. The catalyst helps to speed up the chemical reactions that convert NOx and CO into nitrogen gas, water vapor, and carbon dioxide.

Diesel catalytic converters can be very effective at reducing emissions, but they can also be quite expensive. In addition, they can cause a slight decrease in engine performance. However, the environmental benefits of using diesel catalytic converters far outweigh the disadvantages.