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← ScienceWhich outcome results when a catalytic converter operates sub-optimally?
A)Increased uncombusted hydrocarbon emissions✓
B)Higher particulate matter filter efficiency
C)Decreased engine NOx emission
D)Lower carbon dioxide generation rates
💡 Explanation
Increased uncombusted hydrocarbons result because catalyst poisoning reduces the surface area of catalytic δ-alumina using reactive sites promoting oxidation. Therefore, incomplete conversion of fuel increases hydrocarbon emissions, rather than lowering emissions as is usually the case with a functional catalytic converter.
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