Why Are Three-Way Catalytic Converters Expensive?

[JohnFitz]

Three-way catalytic converters are expensive because the catalysts on the surface of the ceramic substrate are rare precious metals such as palladium and rhodium. Here are the details: How a three-way catalytic converter works: When high-temperature exhaust gases pass through the purification device, the purifying agents in the three-way catalytic converter enhance the activity of CO, HC, and NOx gases, promoting specific oxidation-reduction chemical reactions. This converts harmful gases into harmless carbon dioxide, water, and nitrogen. Precautions for using a three-way catalytic converter: Avoid using leaded gasoline and factors that may cause an overly rich air-fuel mixture, such as leaking fuel injectors, failed fuel pressure regulators, failed oxygen sensors, or failed mass airflow sensors.