In chemistry, TWC stands for Three-Way Catalyst.
A three-way catalyst is primarily used in automotive exhaust systems to reduce harmful emissions. It simultaneously catalyzes three major reactions:
- Oxidation of carbon monoxide (CO) to carbon dioxide (CO₂).
- Oxidation of hydrocarbons (HC) to carbon dioxide (CO₂) and water (H₂O).
- Reduction of nitrogen oxides (NOx) to molecular nitrogen (N₂).
These three reactions work together to convert pollutants into less harmful substances, helping to reduce air pollution from vehicles. The catalyst typically consists of platinum, palladium, and rhodium supported on a ceramic substrate.
