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← ScienceWhich effect accelerates a catalytic converter's initial reaction rate?
A)Exothermic preheating of catalytic core✓
B)Isothermal maintenance of constant temperature
C)Endothermic cooling of exhaust manifold
D)Adiabatic expansion within exhaust flow
💡 Explanation
Exothermic preheating accelerates initial reaction rate by rapidly raising the catalyst's temperature, promoting faster kinetics according to Arrhenius' equation—rather than alternatives dependent on cooling, or constant parameters—because active catalytic sites become more reactive; therefore, conversion efficacy grows faster.
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