

Fertiliser Technology - Engineering
Q1: Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperatureA rate of reaction is very low.
B very high pressure is required resulting in costly pressure vessel.
C space velocity of gas is very low resulting in decreased conversion.
D none of these
ANS:A - rate of reaction is very low. Keeping the temperature moderately high (around 550°C) in the Haber-Bosch process for ammonia synthesis, despite the kinetic preference for lower temperatures, is primarily due to the following reasons:
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