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Which outcome results when catalyst-containing exhaust systems overheat?

A)Catalyst deactivation via thermal sintering
B)Enhanced NOx reduction performance occurs
C)Increased adsorption of air pollutants occurs
D)Reversible catalyst phase transformation occurs

💡 Explanation

Catalyst overheating leads to deactivation because thermal sintering causes the active catalytic material grain growth, reducing the surface area. Therefore, reduced surface area leads to decreased catalyst activity, rather than enhanced pollutant reactions.

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