Does temperature affect the ammonia synthesis reaction

The ammonia synthesis reaction is a reversible exothermic reaction. When the reaction temperature rises, the equilibrium moves in the direction of ammonia decomposition; when the temperature is lowered the reaction moves in the direction of ammonia production. Therefore, from the point of view of equilibrium, in order to make the equilibrium yield of ammonia is high, the lower reaction temperature should be taken.

But from the point of view of the speed of chemical reaction, increase the temperature can always make the reaction speed up, this is because the temperature of the molecular movement accelerated, intermolecular collision rate increases, and at the same time make the molecular ability to overcome resistance to increase, thus increasing the molecular effective combination of the rate.

In short, when the temperature is low, the reaction is conducive to the direction of ammonia synthesis, but the reaction rate of ammonia synthesis is low; increase the temperature is not conducive to the direction of ammonia synthesis, but the reaction rate can be increased. The choice of reaction temperature in actual production is mainly determined by the performance of ammonia synthesis catalyst.