A three-way catalytic converter (TWC) is a crucial component for emission control in contemporary vehicles.
It targets three primary exhaust gas pollutants: Carbon Monoxide (CO), Hydrocarbons (HC), and Nitrogen Oxides (NOx).
Specifically, CO and HC are oxidized into CO2 and water, while NOx is reduced to inert nitrogen and oxygen.
This process renders the three-way converter highly effective in mitigating vehicle emissions.
CO2 and O2 are not considered pollutants requiring conversion.
Sulfur Dioxide (SO2) is managed through alternative methods in certain diesel systems, distinct from standard TWCs.
Consequently, the accurate identification of a pollutant treated by TWCs is NOx.