Why do catalytic converters have a large surface area?

Catalytic converters have a large surface area to maximize the efficiency of the chemical reactions that convert harmful exhaust gases into less harmful emissions. The extensive surface area, typically achieved through a ceramic or metallic honeycomb structure, allows for more contact between the exhaust gases and the catalyst materials, enhancing the reaction rate. This design not only improves the converter's performance but also helps reduce the overall size of the unit while maintaining effective emissions control.