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← ScienceWhich rate-limiting outcome occurs when catalytic converters become excessively sulfurized?
A)Reduced pollutant oxidation efficiency noticeably✓
B)Increased catalyst metal surface area
C)Higher operating temperature attained rapidly
D)Elevated precious metal redox kinetics
💡 Explanation
When sulfur accumulates, it poisons the catalyst by blocking active sites via adsorption, limiting reactant access; therefore, the oxidation of pollutants decreases because the catalytic activity is suppressed, rather than temperature or redox kinetics rising under these sulfurized conditions.
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