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← ScienceWhich outcome limits catalytic converter efficiency near startup?
A)Catalyst thermal mass delays light-off✓
B)Precious metal poisoning deactivates sites
C)Zeolite framework collapses at temperature
D)Excess oxygen lowers reduction potential
💡 Explanation
Emissions increase because catalytic converters rely on a minimum light-off temperature for activity; the catalyst's thermal mass heats slowly, therefore conversion remains low, rather than precious metal disruption causing deactivation at startup.
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