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← ScienceWhich 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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