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← ScienceWhich kinetic effect occurs within catalytic converters when exhaust gas temperature dramatically decreases?
A)Catalyst poisoning by sulfur adsorption
B)Reduced adsorption rate due to kinetic slowdown✓
C)Increased conversion efficiency of hydrocarbons
D)Thermal runaway from exothermic reactions
💡 Explanation
When temperature decreases, catalytic activity diminishes because reaction rates are exponentially dependent on temperature (Arrhenius equation), reducing reactant adsorption and conversion. Therefore, reduced adsorption rates occur, rather than poisoning which requires specific contaminants, increased efficiency conflicting with kinetic slowdown, or thermal runaway requiring elevated temperatures.
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