Why is leaded petrol not recommened for use in catalytic converter?

Leaded petrol is not recommended for use in catalytic converters because the lead in the petrol can damage the catalytic converter and reduce its effectiveness. Catalytic converters are designed to reduce the amount of harmful pollutants in car exhaust, such as carbon monoxide, hydrocarbons, and nitrogen oxides. Lead can coat the surface of the catalytic converter and prevent it from working properly, which can lead to increased emissions of these pollutants. Additionally, lead can also damage the oxygen sensors in a car, which can affect the fuel economy and performance of the vehicle. For these reasons, it is important to use unleaded petrol in cars that have catalytic converters.