The three-way catalyst is similar to a muffler. Its appearance is made of double-layer stainless steel plate. Insulation material asbestos fiber felt is installed in the interlayer. A special filtering and purification device is installed in the middle of the mesh partition.

 

The filtration and purification device is similar to a mesh partition. In fact, it plays a catalytic role. The catalyst uses platinum, rhodium and palladium. One of them is sprayed on the carrier to form a filtration and purification carrier.

 

The working principle of the three-way catalyst is: when the high-temperature automobile exhaust passes through the purification device, the filtering device in the three-way catalyst will enhance the activity of CO, HC and NOx and promote their reduction chemical reaction, in which CO is oxidized to colorless and non-toxic carbon dioxide gas at high temperature; HC compounds are oxidized to water and carbon dioxide at high temperature, and NOx is reduced to nitrogen and oxygen. The three harmful gases become harmless gases to purify automobile exhaust.

 

Therefore, this three-way catalyst is a key link in the vehicle emission system. If the three-way catalyst is damaged or aging, it will directly lead to unqualified vehicle exhaust, and the vehicle cannot pass the annual review normally during the normal annual review.

 

It is also very important to maintain the three-way catalytic converter. Carbon deposit cleaning and oil replacement shall be carried out on time.