Which outcome occurs when a catalytic converter operates below its light-off temperature?

💡 Explanation

When a catalytic converter is below its light-off temperature, the activation energy for the oxidation and reduction reactions is not reached because the catalyst's active sites require sufficient heat, hindering the conversion of pollutants. Therefore hydrocarbon and CO emissions increase, rather than decreased surface area, uncontrolled reaction, or poisoning, which involve other temperature-dependent mechanisms.

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