Three-way catalyst, also known as three-way catalyst, is a kind of equipment used for automobile exhaust treatment.Its main function is to convert harmful substances in automobile exhaust into harmless or low-hazard substances in order to achieve the purpose of reducing environmental pollution.

The working principle of three-way catalyst is to use the characteristics of catalysts to chemically react harmful substances such as carbon monoxide, nitrogen oxides and unburned hydrocarbons at high temperatures, producing harmless or low-hazard substances such as carbon dioxide, nitrogen and water vapor.

Three-way catalyst mainly consists of two parts: carrier and active substance.The carrier is usually made of ceramics or metal, and the active substance is a metal element that can promote chemical reactions, such as platinum, rhodium and palladium.

It should be noted that the three-way catalyst is not omnipotent, it can only deal with part of the harmful substances.For example, for some harmful substances containing sulfur, phosphorus and other elements, the three-way catalyst can not be processed.

The difference between vehicles with three-way catalyst and those without three-way catalyst is mainly reflected in the following aspects:

 1. Environmental performance: when vehicles with three-way catalyst emit exhaust gas, the emission of harmful substances will be greatly reduced, and the environmental pollution will be smaller. Without the three-way catalyst, the emissions of harmful substances in the exhaust gas are higher and the environmental pollution is greater.

 2. Fuel economy: the three-way catalyst can effectively improve the combustion efficiency of fuel, thus improving the fuel economy of the vehicle.Without the three-way catalyst, the fuel combustion efficiency is low and the fuel economy is poor.

 3. Power performance: the three-way catalyst can improve the power performance of the engine and make the car accelerate more rapidly.Without the three-way catalyst, the power performance of the engine may be affected to a certain extent.

 4. Service life: the service life of the three-way catalyst is relatively long, generally up to 8-10 years.Without the three-way catalyst, the service life of the engine may be affected.

 5. Maintenance cost: the maintenance cost of the three-way catalyst is relatively high, and once it is damaged, a new three-way catalyst needs to be replaced.Without the three-way catalyst, the maintenance cost is relatively low.

The three-way catalyst is an important part of the automobile exhaust system, which is mainly responsible for the treatment and reduction of the exhaust gas emissions of the engine, especially the transformation of CO, HC and NOx in the exhaust gas into harmless substances, so as to achieve the reduction of automobile exhaust pollution to the environment.

If the car does not install the three-way catalyst, it will have a variety of adverse effects on the vehicle:

 1. Excessive exhaust emissions: the lack of three-way catalyst will directly lead to the excessive emission of harmful substances such as CO, HC and NOx in the exhaust gas, which will have an impact on the environment.

 2. Increased fuel consumption: the lack of three-way catalyst will affect the normal operation of the oxygen sensor, which will also affect the accuracy of the oxygen sensor signal received by the engine, so that the fuel injection, intake and ignition can not be accurately controlled, and the fuel consumption will increase.

 3. Impaired exhaust and decreased power: the lack of three-way catalyst will affect the power output of the engine. For example, when high-pressure exhaust is needed, the exhaust is not smooth due to blockage, which affects the intake volume, and then leads to the decrease of engine power, and then leads to the decrease of power and weak refueling, and the running will not be strong.

 4. Unable to pass the annual inspection: the lack of three-way catalyst will cause the vehicle to fail to pass the annual inspection.

 5. Obvious leakage sound will be heard when refueling after the vehicle is started: this is because there is no three-way catalyst, the exhaust gas can not be discharged in time, which will cause back pressure backflow. When the pressure exceeds the pressure value of the engine discharge, the exhaust gas will recoil to the combustion chamber, causing the engine to shake, gasp and even stall.

 6. During the driving of the vehicle, the fault light of the engine will light up: this is because there is no three-way catalytic converter, the engine will produce a certain amount of carbon deposits, resulting in the fault light of the engine.

To sum up, not installing three-way catalytic converter will have a negative impact on the operation performance and environmental performance of the vehicle. Therefore, it is recommended to go to a professional 4S shop to re-install the three-way catalytic converter as soon as possible.