text: normally it referes to a three way catalitic converter, a device used in cars for pollution control.\n\nA three-way catalytic converter has three simultaneous tasks:\nreduction of Nitrogen oxides to Nitrogen and Oxygen: 2NOx → O2 + N2\noxidation of Carbon Monoxide to Carbon Dioxide: 2CO + O2 → 2CO2\noxidation of unburnt non-Methane hydrocarbons (HC) to Carbon Dioxide and water: CxHy + nO2 → xCO2 + mH2O