A three-way catalytic converter is a crucial external purification device installed in a car's exhaust system. It converts harmful gases like CO, HC, and NOx emitted from the tailpipe into harmless carbon dioxide, water, and nitrogen through oxidation and reduction processes. As the high-temperature exhaust gas passes through the purification unit, the catalyst in the three-way catalytic converter boosts the reactivity of the CO, HC, and NOx gases, prompting them to undergo certain oxidation-reduction chemical reactions. CO is oxidized into colorless and non-toxic carbon dioxide gas at high temperatures; HC compounds are oxidized into water (H20) and carbon dioxide; and NOx is reduced to nitrogen and oxygen. The three harmful gases are transformed into harmless ones, thereby purifying the car's exhaust.

Three-way catalytic converter, an essential off-carrier purification device installed in the vehicle exhaust system, converts harmful gases such as CO (carbon monoxide), HC (hydrocarbons), and NOx (nitrogen oxides) emitted from the tailpipe into harmless CO2 (carbon dioxide), water, and nitrogen through oxidation and reduction reactions. As this catalytic converter can simultaneously convert the three main harmful substances in the exhaust gas into harmless substances, it is named "three-way."