Symptoms and phenomena of the three-way catalytic converter

The owner of the car knows that his car is equipped with a three-way catalytic device, but does not understand its construction, maintenance and use, which leads to early damage of the catalyst, causing unnecessary losses to the owner. The role of the three-way catalytic converter is to convert HC and CO in the exhaust gas into water and carbon dioxide, and at the same time decompose the Nox into nitrogen and oxygen. The service life of the three-way catalytic converter is not only related to its own quality, but also has a great relationship with the driver's use and daily maintenance. Sometimes when the car is turned on, it is found that the three-way catalytic converter has failed (blocked, or failed). What is the performance of the three-way catalytic converter?

If the owner pays attention to the bottom exhaust pipe, he will find a cylindrical device made of stainless steel sheet like a muffler. This is the three-way catalyst. The interior of the three-way catalytic converter is provided with a carrier and a catalyst. The carrier is generally made of alumina, which is a ceramic-like friable material, which is then formed into a spherical shape, a polygonal shape and a mesh separator shape. The purpose is to have a larger contact area with the exhaust gas. The catalyst uses precious metals such as platinum, rhodium and the like, and they are uniformly sprayed on the carrier to form a purifying agent.

In actual use, if the car has problems such as increased fuel consumption, accelerated acceleration, difficulty in speed increase, or difficulty in starting, the working condition of the three-way catalytic converter should be checked. Normally, the three-way catalytic converter can be cleaned or unblocked to return to normal. Fuel consumption and power. Secondly, when the driver finds the following symptoms, it also indicates that the catalytic converter is not working properly, and should go to the 4S shop for maintenance.

1. There will be obvious red burning phenomenon between the exhaust manifold and the three-way catalytic converter shortly after the vehicle starts.

2. When the vehicle is filling the fuel door, you can hear the sound of “漏” leaking sound or “咕噜咕噜” abnormal sound;

3. When idling or accelerating, you can smell the pungent and smelly smell. If the exhaust gas analysis is carried out, the nitrogen oxides (NOx) will be seriously exceeded, and it should be cleaned and repaired in time;

4. For a normal three-way catalytic converter, the temperature at the front of the catalytic converter is lower than the temperature at the rear. If the temperature at the front of the three-way catalytic converter is higher than the temperature at the rear, the catalytic converter is not working properly.

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