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← ScienceWhich kinetic consequence results when iron catalyst particles agglomerate during ammonia synthesis?
A)Decreased reaction rate per reactor volume✓
B)Increased activation energy for dissociation
C)Shift in equilibrium towards reactants
D)Higher rate of explosive byproduct formation
💡 Explanation
When catalyst particles agglomerate, the total surface area decreases because surface atoms become buried in particle edges, consequently reducing available active sites for reactant adsorption, lowering the reaction rate constant. Therefore, the rate diminishes per volume, rather than activation energy increase lowering equilibrium constant or byproduct increase because mass transport limitation dominates.
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