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← ScienceWhich consequence results when the Damköhler number greatly exceeds one in catalyst design?
A)External mass-transfer limits reactor rate✓
B)Surface area has minimal effectiveness
C)Pore diffusion limitations are minimized
D)Intrinsic kinetics dominate reaction rate
💡 Explanation
When the Damköhler number exceeds one mass transport limitations dominate, because the reaction rate quickly consumes reactants before transport can replenish them, resulting in external mass-transfer becoming rate-limiting rather than reaction kinetics. Therefore the overall reaction slows.
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