Three-way catalyst (TWC)

In lambda controlled three-way catalysts the following three basic reactions are catalyzed in parallel:

2 NO + 2 CO → N₂ + 2 CO₂

2 CO + O₂ → 2 CO₂

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O