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← ScienceWhich 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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