Discussion
State whether the following is true or false.
Ammonia synthesis is run at the temperature that gives the best equilibrium conversion.
Answer: B
Correct answer: False
Ammonia synthesis is exothermic, so equilibrium favours the lowest temperature - at which the rate over the iron catalyst is negligible. The plant runs at 400 to 500 degrees, accepting a poorer equilibrium for a workable rate, and recovers the lost yield by operating at 150 to 250 bar and recycling the unconverted gas. It is the standard illustration of a kinetic and thermodynamic compromise.
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