What does a three-way catalytic converter mean?

[AuroraRose]

A three-way catalytic converter is an important external purification device installed in the automotive exhaust system. It converts harmful gases such as CO, HC, and NOx emitted from vehicle exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions, thereby achieving purification. The three-way catalytic converter is installed in the engine exhaust pipe. Since this converter can simultaneously transform the main harmful substances in exhaust gases into harmless substances, and with increasingly stringent environmental protection requirements, more and more vehicles are equipped with exhaust catalytic converters and oxygen sensor devices. Typically, the substrate of a three-way catalytic converter is made of porous ceramic material, and its air passages are designed in a mesh or polygonal cross-section pattern.