Where is the three-way catalytic converter located in a car?
2 Answers
The three-way catalytic converter is generally installed in the first bulge of the car's exhaust manifold, resembling a device similar to a canteen. It is positioned within the vehicle's exhaust system and serves as a crucial external purification device in the exhaust system. The term "three-way" in the three-way catalytic converter has two interpretations: First, it can convert the three main harmful substances produced after engine combustion into harmless substances. This converter simultaneously transforms the three primary harmful substances resulting from engine combustion into harmless materials, hence the name "three-way." The three main substances are: carbon monoxide, hydrocarbons, and nitrogen oxides. Second, because this converter contains three precious metals: platinum, rhodium, and palladium, it is called "three-way." These three precious metals facilitate the reaction between the three main harmful gases produced after engine combustion, ultimately forming harmless carbon dioxide, nitrogen dioxide, and water.
I remember last time when I got my car repaired, I specifically asked the mechanic about the location of the catalytic converter. It's installed at the front end of the exhaust system, near the engine block below. If you follow the exhaust pipe, you'll find a large metal box-shaped component. It's placed here because when the engine first starts, the exhaust gas temperature is high, which can immediately initiate the catalytic reaction, converting toxic gases like carbon monoxide and nitrogen oxides into harmless substances. That time, I accidentally drove over a big pothole and damaged the catalytic converter, resulting in sluggish acceleration and black smoke from the exhaust. When replacing it, the technician said the location should be chosen to avoid obstacles to prevent impact damage. For regular maintenance, it's best to check the oxygen sensor signals and use standard gasoline to reduce carbon buildup and clogging in the catalytic converter, thereby extending its service life.
