What chemical reaction occurs in a catalytic converter to remove nitrogen oxides?

In a catalytic converter, the key chemical reaction that facilitates the removal of nitrogen oxides involves the reaction between carbon monoxide (CO) and nitrogen monoxide (NO) to produce carbon dioxide (CO₂) and nitrogen gas (N₂). This reaction effectively reduces the harmful nitrogen oxides present in vehicle emissions.

The presence of a catalyst within the converter allows this reaction to occur at lower temperatures and with increased efficiency, which is essential for reducing pollutants released into the atmosphere. The conversion of nitrogen oxides into harmless nitrogen gas contributes significantly to meeting environmental regulations regarding vehicle emissions.

The other options do not accurately represent the primary reaction facilitated by a catalytic converter. For instance, reactions involving water vapor and hydrogen or solely the decomposition of nitrogen dioxide do not reflect the removal of nitrogen oxides in the manner enabled by catalytic converters.