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Which risk increases significantly when a catalyst in a fixed-bed chemical reactor experiences thermal runaway?

A)Uncontrolled reaction exothermicity
B)Decreased substrate diffusion rates
C)Enhanced product selectivity
D)Reduced catalyst surface fouling

💡 Explanation

Uncontrolled reaction exothermicity becomes pronounced during thermal runaway because the Arrhenius equation dictates an exponential increase in reaction rate promoting runaway; therefore, significant energy is released, rather than controlled catalysis or diffusional limitations.

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