Why are catalytic converters removed from used cars?

[MadelineFitz]

Selling catalytic converters for profit. Below is an introduction to catalytic converters: 1. Introduction: The catalytic converter, installed in a vehicle's exhaust system as the most crucial external purification device, converts harmful gases like CO, HC, and NOx emitted from vehicle exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions. When high-temperature exhaust gases pass through this purification device, the catalyst inside the catalytic converter enhances the activity of CO, HC, and NOx, promoting specific oxidation-reduction chemical reactions. CO oxidizes into colorless, non-toxic carbon dioxide gas at high temperatures; HC compounds oxidize into water (H2O) and carbon dioxide; NOx reduces into nitrogen and oxygen. These three harmful gases are transformed into harmless substances, thereby purifying the vehicle's exhaust. 2. Performance characteristics: Catalytic converters feature stable performance, reliable quality, and long service life.