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← ScienceWhich outcome occurs in a catalytic converter when exhaust gas flow fluctuates rapidly?
A)Oscillating reaction rates, reduced efficiency✓
B)Substrate sintering, decreased surface area
C)Catalyst poisoning, irreversible deactivation
D)Increased backpressure, engine performance drop
💡 Explanation
When exhaust gas flow fluctuates, the reaction rate oscillates due to transient variations in reactant concentrations and residence time, leading to incomplete conversion and reduced efficiency because the catalyst system struggles to maintain optimal conditions. Therefore, oscillating reaction rates occur, not sintering, poisoning or backpressure from sustained overload conditions.
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