Why does maximizing the surface area of the core increase the effectiveness of a catalytic converter

A catalytic converter is an emissions control device that converts toxic gases and pollutants in exhaust gas to less toxic pollutants by catalyzing a redox reaction (an oxidation and a reduction reaction). Catalytic converters are used with internal combustion engines fueled by either petrol (gasoline) or diesel - including lean-burn engines as well as kerosene heaters and stoves.