Why is palladium widely used in automobile catalytic converters?

Palladium is widely used in automobile catalytic converters because it acts as an effective catalyst to accelerate the chemical conversion of harmful exhaust gases into less damaging substances.1

Within the converter, palladium—often used in combination with rhodium—facilitates the oxidation of hydrocarbons and carbon monoxide into water and carbon dioxide. Additionally, it assists in the reduction of nitrogen oxides into nitrogen and oxygen. This process is essential for meeting modern automotive emission standards, which mandate the reduction of pollutants discharged from internal-combustion engines.213