Chronic poisoning
The catalyst is very sensitive to elements such as sulfur, lead, phosphorus, and zinc. Sulfur and lead come from gasoline, and phosphorus and zinc come from lubricating oil. These four substances and their oxide particles formed after combustion in the engine are easily adsorbed on the catalyst. surface, so that the catalyst cannot contact the exhaust gas, thus losing its catalytic effect, the so-called “poisoning” phenomenon.
surface area carbon
When the car works at a low temperature for a long time, the three-way catalytic converter cannot be started, and the soot emitted from the engine will adhere to the surface of the catalyst, making it impossible to contact CO and HC. In the long run, the pores of the carrier will be blocked, affecting its conversion efficiency. .
Exhaust deterioration
The catalytic converter’s ability to convert pollutants has a certain limit, so the original exhaust gas must be minimized through in-machine purification technology. If the concentration and total amount of each component of the exhaust gas pollutants are too large, such as the mixture is too rich, it will affect the catalytic conversion capacity of the catalyst and reduce its conversion efficiency. In addition, after a large amount of HC and CO in the exhaust gas enter the catalytic reactor, an excessive oxidation reaction will occur therein, and the oxidation reaction generates a large amount of heat, which will cause the catalytic reactor to be damaged due to excessive temperature.