Three-way catalysts (TWC) are designed to simultaneously convert three pollutants to harmless emissions: Carbon Monoxide (CO) → Carbon Dioxide (CO2). Hydrocarbons (HC) → Water (H2O). Oxides of Nitrogen (NOx) → Nitrogen (N2). A three-way catalyst can cut CO, HC and NOx by over 99% if the air to fuel ratio is accurately controlled.
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