What Types of Catalysts are Used in Emission Control Systems?
In emission control systems, several types of catalysts are used, including three-way catalysts (TWCs), diesel oxidation catalysts (DOCs), and selective catalytic reduction (SCR) catalysts. TWCs are common in gasoline engines and help convert nitrogen oxides (NOx), carbon monoxide (CO), and hydrocarbons (HC) into nitrogen (N2), carbon dioxide (CO2), and water (H2O). DOCs are used in diesel engines to oxidize CO and HC, while SCR systems reduce NOx emissions using a urea-based solution.
