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← ScienceWhich outcome primarily governs steady-state conversion in a catalytic reactor when space velocity significantly increases?
A)Shifting rate-determining step control
B)Equilibrium constant dominance diminishes
C)Catalyst poisoning from reactant excess
D)Intraparticle diffusion limitation intensifies✓
💡 Explanation
When space velocity increases significantly, the residence time of reactants inside a catalytic reactor decreases, enhancing intraparticle diffusion limitations because reactants are unable to diffuse into the core of the catalyst pores before exiting. Therefore, intraparticle diffusion intensifies, rather than shifting rate-determining steps, loss of equilibrium, or reactant poisoning, which result from different conditions.
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