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← ScienceWhich outcome results when a packed-bed reactor with solid catalyst experiences increased intraparticle diffusion limitations?
A)Observed reaction rate decreases sharply✓
B)Effective catalyst surface area increases
C)Reactor selectivity shifts predictably
D)Exothermic hotspots become increasingly stable
💡 Explanation
The observed reaction rate drops because increased intraparticle diffusion limits reactant access to the catalyst's active sites, becoming rate limiting, rather than the intrinsic reaction kinetics themselves. Therefore, the rate decreases, rather than selectivity changes or activity increases.
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