What does catalytic convert to?

A catalytic converter is an emissions control device that converts harmful gases produced by an internal combustion engine into less harmful substances. Specifically, it transforms carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) into carbon dioxide (CO2), nitrogen (N2), and water vapor (H2O). This process is facilitated by catalysts, typically made of platinum, palladium, and rhodium, which accelerate the chemical reactions without being consumed in the process.