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Which risk increases when uncombusted methane reaches catalytic converter temperatures?

A)Aggressive catalytic reaction runaway will occur
B)Steam-induced catalyst grain sintering happens
C)Partial oxidation inhibits NOx reduction
D)Methane emission rate slowly self-corrects

💡 Explanation

Runaway (positive feedback) is promoted because the Arrhenius equation dictates that increasing temperatures dramatically increase reaction rates. Faster oxidation of uncombusted methane heats the catalyst further, therefore a runaway reaction will occur rather than controlled reactions or self-corrections at those high temperatures.

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