Chemicals · Vol. IV|Haber–Bosch ammonia|1909 (Haber); 1913 (Bosch industrial)
Haber–Bosch ammonia
1909 (Haber); 1913 (Bosch industrial)
Plants need nitrogen. The air is full of it, locked as N₂. Haber found a catalyst, heat, and pressure that would stitch hydrogen to nitrogen as ammonia. Bosch scaled the autoclaves. Fertilizer from air fed a population boom. The same ammonia fed explosives in both world wars. Few processes have a double ledger so stark.
Fritz Haber; Carl Bosch · Germany
How the mechanism is arranged
How it works
- Mix nitrogen and hydrogen at high pressure over an iron catalyst.
- Ammonia forms; cool it out; recycle the rest.
- Convert ammonia to nitrates for fertilizer or further chemistry.
Why it mattered
- Broke the limit set by Chilean nitrate and manure.
- Supports a large share of the world’s food calories today.
- Tied agriculture to fossil hydrogen and to the ethics of dual use.
Who turned the wheel
What it unlocked
For further study
- Smil, Enriching the Earth. Haber–Bosch and population.
- Nobel lectures, Haber and Bosch. Primary scientific accounts.
Check
Why is atmospheric nitrogen useless to most crops without help?