- Automotive catalysts were implemented in production in the US (1975).
- Japan and thereafter Europe (1986) adopted the use of automotive catalysts.
- The most common type of catalyst found on gasoline engines is the so called: Three-way catalyst (TWC) :
Carbon Monoxide (CO) → Carbon Dioxide (CO2)
Hydrocarbons (HC) → Water (H2O)
Oxides of Nitrogen (NOx) → Nitrogen (N2)