The most important external purification device installed in the automobile exhaust system, it can convert the harmful gases such as CO, HC and NOx discharged from the automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction. Because this catalytic converter can simultaneously convert the main harmful substances in the exhaust gas into harmless substances. With the increasingly stringent environmental protection requirements, more and more vehicles have installed exhaust gas catalytic converters and oxygen sensors. It is installed in the engine exhaust pipe, through the REDOX reaction, carbon dioxide and nitrogen, so it is also called a three-way (effect) catalytic converter.

Of course, the main role of the three-way catalytic converter is obvious, and its role is mainly to purify the air discharged from the tail of the car. When the high-temperature automobile exhaust passes through the purification device, the purifier in the three-way catalytic converter will enhance the activity of the three gases CO, HC and NOx, and promote it to carry out a certain oxidation-reduction chemical reaction.

CO oxidizes at high temperature to become colorless, non-toxic carbon dioxide gas; HC compounds are oxidized to water (H20) and carbon dioxide at high temperatures; NOx reduction to nitrogen and oxygen; This achieves the purpose of purifying the air, which is a main role of the three-way catalytic converter.