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Which consequence follows when industrial ammonia synthesis uses excessively high pressures?

A)Catalyst poisoning accelerates sharply
B)Equilibrium shifts unfavorably for ammonia
C)Haber-Bosch process becomes endothermic
D)Adsorption kinetics become rate-limiting overall

💡 Explanation

Excessive pressure increases reactant concentration at the catalyst surface, which accelerates catalyst poisoning because active metal sites are blocked due to stronger chemisorption of impurities; therefore, catalyst activity degrades rapidly, rather than improving equilibrium which only plateaus at the optimum pressure.

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