Which outcome occurs when a catalytic converter's platinum catalyst is coated with silicone compounds?

💡 Explanation

When silicone contaminates the platinum catalyst, catalyst poisoning occurs because silicone binds strongly to the active sites, blocking reactant molecules and reducing available area for reaction, decreasing NOx conversion. Therefore reduced NOx conversion efficiency results, rather than increased CO, elevated temperatures, or decreased combustion, which require different mechanisms.

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