What is the chemical process by which a catalytic converter reduces NOx emissions?

A catalytic converter reduces NOx emissions through a chemical process called reduction. NOx, or nitrogen oxides, are formed during high-temperature combustion in an engine. Catalytic converters typically use a three-way catalyst, which simultaneously reduces NOx, oxidizes hydrocarbons (HC), and oxidizes carbon monoxide (CO). The NOx reduction process involves converting NOx into nitrogen gas (N2) and oxygen gas (O2). This occurs on the catalyst surface, which is typically made of platinum, palladium, and rhodium. Rhodi....