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  How Does the Catalytic Converter Work? Catalytic Converter A Catalytic Converter is a device that helps to convert pollutants in exhaust gas from an internal combustion engine into less harmful substances. The main function of a catalytic converter is to reduce emissions of carbon monoxide (CO), hydrocarbons (HC), and oxides of nitrogen (NOx). Catalytic converters are typically used on vehicles that run on gasoline or diesel fuel, such as cars, trucks, and buses. Some converters are designed for use with other fuels, such as natural gas or propane. How do catalytic converters work? Catalytic converters make use of a chemical reaction to convert pollutants into less harmful substances. The converter contains a catalyst, which is a material that helps to speed up the reaction. The most common type of catalyst used in catalytic converters is platinum. The converter also contains a honeycomb-like structure made of ceramic or metal that provides a large surface area for the reaction t...