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← ScienceWhich outcome occurs when a catalytic converter operates continuously with excessive hydrocarbons and insufficient oxygen?
A)Catalyst poisoning by carbon deposition✓
B)Substrate melting from extreme exotherm
C)Thermal shock failure of ceramic bricks
D)Pressure buildup due to impeded flow
💡 Explanation
When excess hydrocarbons and insufficient oxygen reach the catalytic converter, incomplete combustion leads to carbon deposition on the catalyst surface, because the catalyst active sites are blocked, reducing efficiency. Therefore catalyst poisoning results, rather than melting, thermal shock, or pressure buildup which require different imbalances and temperatures.
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