Which consequence results when an automotive catalytic converter operates at excessively high temperatures?

💡 Explanation

When converter temperatures rise excessively, the equilibrium of the NOₓ decomposition reaction shifts towards reactants because the reaction converting NOx into N2 and O2 is exothermic, hindering NOₓ reduction. Therefore reduced NOₓ conversion results, rather than increased CO oxidation, decreased hydrocarbon efficiency, or elevated filtration, which are independent of thermal equilibrium effects.

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