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Working Principle of Three-way Catalytic Converter

Three-way Catalytic Converter: Enhance Gas Activity

The working principle of the three-way catalytic converter is: when the high-temperature automobile exhaust gas passes through the purification device, the purifying agent in the three-way catalytic converter will enhance the activity of the three gases of CO, HC and NOx, prompting them to carry out a certain oxidation-reduction chemical reaction, in which CO is oxidized to colorless, non-toxic carbon dioxide gas at high temperature; HC compounds are oxidized to water (H20) and carbon dioxide at high temperature; NOx is reduced to nitrogen and oxygen. The three harmful gases are turned into harmless gases, so that the exhaust gas of the car can be purified.

catalytic converter


Catalytic substrate:

The 3-way catalytic converter is similar to a muffler. Its outer surface is made of double-layer stainless steel sheet in a cylindrical shape. Insulation material –  asbestos fiber felt is installed in the double-layer thin plate interlayer. The interior is filled with a purifying agent in the middle of the mesh partition. The scavenger consists of the honeycomb catalyst substrate and a catalyst.

The catalyst converter is generally made of aluminum oxide, and its shape includes spherical, polygonal and mesh partitions. The scavenger is actually catalytic, also known as a catalyst. The catalysts used are platinum, rhodium, and palladium. Spraying one of them on the catalyst substrate constitutes a scavenger.