The role of a three way catalytic converter, what is a three way catalytic converter

The three-way catalytic converter is the most important external purification device installed in the automobile exhaust system, which can convert harmful gases such as CO, HC and NOx emitted from automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction. When the high-temperature automobile exhaust gas passes through the purification device, the purification agent in the three-way catalytic converter will enhance the activity of CO, HC and NOx, and promote it to carry out a certain oxidation-reduction chemical reaction, in which CO is oxidized into colorless and non-toxic carbon dioxide gas at high temperature; HC compounds are oxidized to water (H20) and carbon dioxide at high temperatures; NOx is reduced to nitrogen and oxygen. The three harmful gases become harmless gases, so that the exhaust gas of the car can be purified.

The three-way catalytic converter is the most important external purification device installed in the automobile exhaust system, which can convert harmful gases such as CO carbon monoxide, HC hydrocarbons and NOx nitrogen oxides discharged from automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction.

Because this catalytic converter can convert the three main harmful substances in the exhaust gas into harmless substances at the same time, it is called ternary.

Chinese name. Three-way catalytic converter. Generally. State.

The most important off-board purification device.

How it works. Enhances gas activity.

Catalytic spraying carriers.

The role of the three-way catalytic converter.

The three-way catalytic converter is the most important external purification device installed in the exhaust system of automobiles.

The three-way catalytic converter converts harmful gases such as CO, HC and NOx from automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction.

The working principle of the three-way catalytic converter is: when the high-temperature automobile exhaust gas passes through the purification device, the purification agent in the three-way catalytic converter will enhance the activity of CO, HC and NOx three gases, and promote it to carry out a certain oxidation-reduction chemical reaction, and the meta-catalytic reactor is similar to the muffler. Its outer part is made of a double layer of stainless steel sheet to make a barrel.

In a double-layer sheet interlayer is installed an insulating material - asbestos fiber felt. The inside is filled with a purifying agent in the middle of a mesh partition. The purification agent consists of a carrier and a catalyst.

The three-way catalytic converter is the most important external purification device installed in the exhaust system of automobiles. It is possible to convert a part of the car exhaust into non-harmful substances and then discharge them into the air, because it can be converted into harmless substances by three harmful substances, so it is called ternary, and its existence can reduce a large part of the emissions of harmful cars.

The three-way catalytic converter cleaning agent is made of chlorine-free benzene-based environmentally friendly solvent, which can strongly clean impurities, carbon deposits and other attachments in the three-way catalytic converter device of automobiles; Prevent the occurrence of catalytic converter poisoning due to heavy metal adhesion; Reducing the emission of harmful substances in the exhaust gas can also remove deposits from the intake tract, valve, combustion chamber and at the same time, improve the efficiency of the engine, save energy and reduce consumption significantly after cleaning, and improve the exhaust emission standard.

The so-called three-way catalytic converter is usually installed in the exhaust pipe of the head section of the exhaust valve closest to the engine exhaust valve of the automobile exhaust system, usually looks like a silencing package on the exhaust pipe, the outside is made of double-layer stainless steel, the interlayer is equipped with thermal insulation materials, and the internal part that looks like a network is composed of a carrier and a catalytic material. However, its carrier does not participate in catalysis, and the main materials used to catalyze the exhaust gas are platinum, rhodium, palladium and other materials covered on the carrier, which catalyzes the exhaust gas discharged from engine combustion under the action of high temperature, and converts harmful gases into harmless substances through oxidation and reduction.

How does a three-way catalytic converter work, and why do cars have to install it? Today is a long time to see.

It is said that the three-way catalytic converter has a special role in turning decay into magic, so what is the role of the three-way catalytic converter? When the car ignition starts, the engine rumbles into operation, the engine will produce a certain amount of energy in the process of operation, and will also discharge a certain amount of exhaust gas, such as CO, HC, NOX and other harmful gases, at this time, the three-way catalytic converter plays a role in purifying such gases, so that the exhaust gas can be purified, reducing the pollution of the human body and the air.

Three-way catalysis is the use of some chemical agents to carry out a series of chemical reactions with harmful gases in the tail gas to convert them into harmless gases. Whether the three-way catalytic converter can work normally determines the fuel consumption, power, emissions and other working conditions of the engine.

The three-way catalytic converter is used to purify the exhaust gas, the three-way catalytic converter can reduce the pollutants in the exhaust gas, the three-way catalytic converter is good for protecting the earth, and the three-way catalytic converter will be installed on the exhaust pipe of every car. The three-way catalytic converter is installed at the head of the exhaust pipe, which is an important component for the car.

The exhaust pipe of the car is composed of three parts, which are the head section, the middle section, and the tail section.

The first section is the exhaust manifold, and the three-way catalytic converter is installed behind the exhaust manifold, and the exhaust gas of the engine passes through the three-way catalytic converter after it is discharged.

After the exhaust gas passes through the three-way catalytic converter, the content of pollutants and toxic substances decreases.

There are also two oxygen sensors in front and behind the three-way catalytic converter.

In front of the three-way catalytic converter is the front oxygen sensor, and behind the three-way catalytic converter is the rear oxygen sensor.

The front oxygen sensor is mainly used to detect the oxygen content in the exhaust gas, and the ECU can adjust the air-fuel ratio according to the signal from the front oxygen sensor.

The rear oxygen sensor is mainly used to detect whether the three-way catalytic converter is failing.

If the data transmitted to the ECU by the front and rear oxygen sensors is the same, it means that the three-way catalytic converter has failed.

If the three-way catalytic converter fails, the car's dashboard will light up a fault light to alert the driver.

If the three-way catalytic converter fails, it needs to be replaced immediately, otherwise it will affect the normal operation of the car engine.

The main function of three-way catalysis is to purify exhaust gas!

There is also an oxygen sensor on the three-way catalysis, which controls emissions and the air-fuel ratio of the engine, that is, the proportion of air to fuel.

If the three-way catalysis is removed, the engine will not wait for the feedback signal, and then the engine will think that there is a fault, enter a primitive setting state, and work according to the standard air-fuel ratio, which can not be used to increase or reduce the engine power.

It can only be said that the exhaust resistance is reduced, so that the impact of the engine power is minimal.

The consequence is that fuel consumption rises, emissions exceed the standard, and noise increases!

It's just an extra three-way catalytic converter.

<> "Content Overview: The Functions and Effects of Three-Way Catalytic Converters, and the Concept of "Inline Transmission" in Racing.

With the gradual upgrading of automobile manufacturing emission standards, three-way catalytic converters have gradually become the focus of car enthusiasts. What is the function of this assembly, and what principle does it rely on to achieve exhaust gas purification?

There are two things you need to know to solve this problem: the temperature of the exhaust gas is very, very high, and there is a standard of 900 when it is discharged from the body to the exhaust manifold, and it only takes 100 oh to boil water. Therefore, the high-temperature exhaust gas meets the first requirement of catalysis (purification), that is, the starting temperature exceeds 200 degrees.

The concept of "ternary".

Hydrocarbon.

Nitrogen oxides. Carbon monoxide.

The catalytic converter uses platinum, rhodium and palladium as catalysts, and performs a fixed-time reduction reaction with the above three gases in a high-temperature environment, and obtains oxygen, nitrogen, carbon dioxide and water after the reaction.

However, this is not 100% catalytic for the three substances, but only a reduction in emissions.

The point has been marked: what does a fixed time reduction reaction mean? Theoretically, it is only possible to achieve full purification by confines the exhaust gas in the accelerator filter element and allows sufficient time for its reaction. But you can't do that!

The reason is that the engine is connected with the intake system and the exhaust system, and if the exhaust gas is blocked in the three-way catalytic converter for a long time and cannot be discharged, the result will inevitably form back pressure and cause the engine to be unable to take in; To put it bluntly, the process of plugging the catalytic converter makes the car have "intestinal obstruction", and it can't be pulled out, so it naturally can't be swallowed.

The concept of "in-line".

Modified cars or high-performance racing cars, these vehicles are not equipped with three-way catalytic converters, and they are not even equipped with front and rear mufflers! Why is that?

The reason is that as long as there is a catalytic converter and a muffler, the flow rate of combustion exhaust gases after it flows out of the engine will be affected; To put it bluntly, the intake efficiency is reduced by the exhaust resistance, and the fuel injection of the engine will also be reduced simultaneously.

The result will be a simultaneous reduction in the total amount of oil and gas in the mixture, and the torque power of combustion conversion will naturally not be high. So these cars are not equipped with catalytic systems and sound attenuation, even though the emissions will be high and the noise will be loud.

Knowledge points: Ordinary household transportation cars are not suitable for this state, because after removing the catalytic converter and muffler, the emissions generated by about 300 million cars in the country will be ridiculously large, and the air quality is absolutely uncontrollable. The elimination of the silencer causes noise pollution, which is also damaging to the environment.

However, the most important thing is that it will cause a significant increase in fuel consumption, because the exhaust will be very smooth without pressure, and the efficiency of the engine will be very high. To put it bluntly, a little throttle speed can be pulled to four or five thousand rpm, and the car can run a long way.

The role of the three-way catalytic converter: 1. It is said that the three-way catalytic converter has a special role in turning decay into magic, so what is the role of the three-way catalytic converter; 2. When the ignition of the car starts, the engine will rumble, and the engine will produce a certain amount of energy during the operation, and at the same time, a certain amount of exhaust gas, such as CO, HC, NOX and other harmful gases; 3. At this time, the three-way catalytic converter plays a role in purifying such Xunwei gas, so that the exhaust gas can be purified and reduce the pollution to the human body and air; 4. Three-way catalysis is the use of some chemical agents to carry out a series of chemical reactions with harmful gases in the tail gas to convert them into harmless gases. Whether the three-way catalytic converter can work normally determines the fuel consumption, power, emissions and other working conditions of the engine.