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Which mechanism limits reaction rate in a catalytic converter operating at low temperature?

A)Reduced surface adsorption
B)Increased catalyst poisoning
C)Elevated exhaust backpressure
D)Enhanced thermal decomposition

💡 Explanation

At low temperatures, fewer reactant molecules possess the necessary activation energy to effectively adsorb onto the catalytic surface, limiting the number of successful reaction events. Therefore, reduced surface adsorption limits the rate, rather than poisoning, backpressure, or decomposition, requiring different conditions.

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