Currently the most important process of fixing nitrogen, in which the nitrogen is made to combine with hydrogen under influence of high temperatures 400 -500 C, high pressure 2 x 107 N m 2, and catalyst of finely-divided iron from iron III oxides, in large continuous enclaves. Many variants operate at different pressures according to the catalyst. The product ammonia may be dissolved in water or condensed, and unreacted gases recycled.

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