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Which risk significantly increases when continuously straining a catalytic converter heated by irregular internal combustion?

A)Catalyst particle surface area reduction
B)Increased carbon monoxide production rate
C)Decreased platinum oxidation number
D)Increased hydrothermal sintering formation

💡 Explanation

Increased thermal cycling causes hydrothermal sintering, altering the catalyst's crystalline structure because it favors larger, less active particles; eventually, reduced surface area impairs function, therefore catalyst activity decline, rather than oxidation number being affected; CO production changes depend on richness.

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