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← ScienceWhich outcome occurs when a catalytic converter's washcoat becomes contaminated with silicone?
A)Reduced catalyst surface area✓
B)Increased NO[x] formation
C)Lower exhaust gas temperature
D)Elevated carbon monoxide emission
💡 Explanation
When silicone contaminates the washcoat, it blocks the catalyst's active sites, forming silicon dioxide which reduces the available surface area because it inhibits the oxidation and reduction reactions. Therefore reduced catalyst surface area results, rather than altering gas temperature, or emissions which require specific catalyst poisoning or deactivation mechanisms.
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