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Which consequence results when a catalytic converter's cerium oxide is thermally aged?

A)Reduced oxygen storage capacity
B)Increased platinum surface dispersion
C)Enhanced rhodium catalytic activity
D)Improved nitrogen oxide reduction

💡 Explanation

Reduced oxygen storage occurs because sintering decreases surface area via Ostwald ripening, a thermodynamic process that reduces total surface energy; therefore cerium oxide's oxygen buffering diminishes rather than other noble metal activities within the converter under normal operating conditions.

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