Which effect arises when metal catalyst surface area is drastically reduced by sintering during industrial ammonia synthesis (Haber-Bosch)?

💡 Explanation

When sintering reduces catalyst surface area, the number of active catalytic sites decreases because there are fewer surfaces for reactants to adsorb and react, limiting the overall reaction rate. Therefore a decreased rate of ammonia production results, rather than byproducts, equilibrium shifts, or changes in activation energy which involve different chemical mechanisms.

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