What is the performance of three-way catalysis?How to clean the three-way catalysis

threeYuanThe catalytic converter, as the most important component in the exhaust gas purification system of gasoline vehicles, is responsible for the catalytic reduction of harmful gases such as carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides NOx in the exhaust gas: the CO, HC and The three main harmful gases of NOx are catalytically reduced into non-toxic and harmless water (H₂O), carbon dioxide (CO₂), nitrogen (N₂) And oxygen (O₂)discharge.

When the high-temperature automobile exhaust gas undergoes three-way catalysis, the purifier in the three-way catalysis will enhance the activity of the three harmful gases CO, HC and NOx, and promote their oxidation-reduction reactions. But if the three-way catalysis is blocked, the oxidation-reduction reaction will be greatly reduced, so how do we judge that the three-way catalysis is blocked? How to clean the three-way catalytic block?

How to judge that the three-way catalyst is blocked

1. Poor exhaust and engine overheating

If the three-way catalytic converter is damaged and blocked, the engine temperature will easily become too high due to the accumulation of high-temperature exhaust gas.

2. Increase in fuel consumption and decrease in power

Three-way catalytic blockage will affect the normal signal of the oxygen sensor, which will result in the engine's inability to accurately control the fuel injection volume, which will result in increased fuel consumption and decreased power.

3. The engine fault light is on

When the engine electronic control ECU fails to monitor or monitors the oxygen sensor signal is abnormal, the engine fault light will light up.

4. Carbon accumulation

As the air-fuel ratio of the combustible mixture in the cylinder is seriously unbalanced, the carbon deposits produced by incomplete combustion will accumulate in the cylinder in a large amount, thereby increasing the "chronic disease" of the engine.

How to clean the three-way catalysis?

The three-way catalytic cleaning mode has two types: no disassembly cleaning and disassembly cleaning.

Disassembly-free cleaning is the same way as cleaning the engine oil circuit and carbon deposits by using a bottle to clean. At present, this form is promoted by 4S shops and maintenance shop owners. The advantage is that it is convenient to clean, but the cleaning effect is not obvious.

Disassembly and washing means removing the three-way catalyst and soaking it in an oxalic acid solution. This method has a good cleaning effect, but it is relatively troublesome and has been rarely used.