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← ScienceWhich outcome occurs when endothermic reaction in catalytic converter has insufficient activation energy at startup?
A)Increased hydrocarbon emissions✓
B)Catalyst poisoning from sulfur buildup
C)Overheating of exhaust manifold
D)Backpressure increase due to soot formation
💡 Explanation
When an endothermic reaction lacks sufficient activation energy at a catalytic converter startup, the reaction rate limiting step is the catalyst's ability to lower the activation barrier causing incomplete conversion. Therefore increased hydrocarbon emissions result, rather than poisoning, overheating, or backpressure increase which require different thermal or chemical mechanisms.
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