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← ScienceWhich outcome occurs when an exhaust catalyst's temperature drops significantly below its light-off temperature?
A)Reduced NOₓ to N₂ conversion✓
B)Increased SO₂ to SO₃ equilibrium
C)Enhanced H₂O formation kinetics
D)Accelerated CO oxidation reaction
💡 Explanation
Less heat energy lowers the reaction rate because Arrhenius equation shows that the rate constant is exponentially dependent on temperature. Since NOₓ reduction requires activation energy, this conversion decreases via suppressed reaction kinetics, rather than oxidation or water formation, requiring high temperature.
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