A catalytic converter is an emissions control device that converts toxic gases and pollutants in the exhaust gas to less toxic pollutants by catalysing a redox reaction (an oxidation and a reduction reaction). Catalytic converters are used with internal combustion engines fuelled by either petrol (gasoline) or diesel—including lean-burn engines as well as kerosene heaters and stoves. These converters combined oxygen with carbon monoxide (\\\\(CO\\\\)) and unburned hydrocarbons (\\\\(HC\\\\)) to produce carbon dioxide and water.