Which outcome results when a catalytic converter's operating temperature drops significantly below designed parameters?

💡 Explanation

When catalytic converter temperature drops, the activation energy for oxidation and reduction reactions is not sufficiently overcome, lowering reaction rates and therefore leading to incomplete conversion of hydrocarbons and CO. This results in increased uncombusted emissions, rather than catalyst degradation, NOx efficiency, or thermal runaway, which all require higher temperatures or different active mechanisms.

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