There are mainly two types of catalytic converters:
Three-way catalytic converters (TWCs): These are commonly used in gasoline engines and can simultaneously reduce NOx, CO, and HC emissions. They are called "three-way" because they facilitate three different reactions: oxidation of CO, oxidation of HC, and reduction of NOx. Diesel oxidation catalysts (DOCs): These are used in diesel engines to oxidize CO and HC emissions into COâ and HâO. However, they are not effective in reducing NOx emissions, which is why additional technologies like selective catalytic reduction (SCR) are often used in conjunction.
