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Why does the Haber-Bosch process require high pressure?
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ammonia
Ammonia and amines have a slightly flattened trigonal pyramidal shape with a lone pair of electrons above the nitrogen. In quaternary ammonium ions, this area is occupied by a fourth substituent.
The Haber-Bosch process requires high pressure because the yield of ammonia is directly influenced by the reaction conditions. Specifically, the higher the pressure used during the synthesis of ammonia from nitrogen and hydrogen, the greater the proportion of ammonia produced in the resulting mixture.1
By applying pressures ranging from 200 to 400 atmospheres, the process effectively shifts the chemical equilibrium to favor the formation of the product. While a catalyst is used to allow the reaction to occur at more practical temperatures, the high-pressure environment remains essential for making the industrial fixation of nitrogen economically feasible.12