● The three-way catalytic converter is the most important external purification device installed in the automobile exhaust system. The three-way catalytic reactor is similar to a muffler. Its outer surface is made of double-layer stainless steel sheet in a cylindrical shape. A heat-insulating material-asbestos fiber felt is installed in the double-layer sheet sandwich. Inside, there is a purifying agent in the middle of the mesh partition. The purifying agent is composed of a substrate and a catalyst. The main function of the 3 way catalytic converter is to convert harmful gas into harmless gas, which plays a role in protecting the environment. It is installed in the exhaust pipe of a car, close to one end of the engine. After the exhaust gas is discharged, it is converted through three-way catalysis. After the exhaust gas is converted, it is discharged outside the car.