What is three-way catalysis? What kinds of three-way catalysis are included?

First, what is three-way catalysis? Three-way catalysis is a very important external purification device in automobile exhaust system. Its main function is to make the harmful gas emitted by the engine become harmless gas.

The three-way catalytic converter is located in the first section of the automobile exhaust pipe, and its shape is similar to that of a marching pot.

There are two explanations about "three-way" in three-way catalyst. There is a theory that the catalytic converter contains three precious metals: platinum (Pt), rhodium (Rh) and palladium (Pd), so it is called ternary.

These three precious metals can promote the three main harmful gases produced after engine combustion to react with each other, and finally produce harmless carbon dioxide, nitrogen dioxide and water.

To put it another way, the three-way catalytic converter can convert three main harmful substances produced by engine combustion into harmless substances at the same time, so it is called three-way.

Three main harmful substances are: CO (carbon monoxide), HC (hydrocarbons) and nitrogen oxides (nitrogen oxides).

If the three-way catalysis is broken, there will be the following disadvantages:

1, the three-way catalyst has an oxygen sensor, which will affect the closed-loop control of oxygen concentration, and then affect the fuel injection control and throttle opening.

2. It pollutes the environment and cannot pass the exhaust gas detection during the annual inspection.

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