We still can't make fertilizer the gentle way that bacteria do

The problem

Nearly all synthetic fertilizer is made by the Haber–Bosch process, which forces nitrogen and hydrogen together over an iron catalyst at hundreds of degrees and around 200 atmospheres of pressure. It consumes on the order of 1–2 percent of the world's energy and emits large amounts of carbon dioxide. Yet the enzyme nitrogenase in ordinary soil bacteria performs the same nitrogen-to-ammonia conversion at ambient temperature and pressure, and chemists still cannot match that feat at any useful scale. Molecular catalysts and electro-, photo-, and plasma-driven routes exist, but none approaches the efficiency, rate, and durability needed to rival Haber–Bosch.

Why it matters

Ammonia synthesis feeds roughly half the world's population through fertilizer, so a mild, low-energy route would cut a major slice of global energy use and industrial carbon emissions. It could also enable distributed, on-site fertilizer production and green ammonia as a fuel.

Progress so far

• 1909Fritz Haber demonstrates ammonia synthesis from its elements, later scaled up industrially by Carl Bosch
• 2003Yandulov and Schrock report the first molecular catalyst to convert N₂ to ammonia at room temperature and 1 atmosphere
• 2011Nishibayashi and co-workers introduce a molybdenum pincer catalyst, boosting molecular catalytic turnover
• 2026reviews and new electro-, photo-, plasma-, and molecular-catalysis approaches still fall far short of replacing Haber–Bosch on efficiency and scale

References

1. Wikipedia — contrast between ambient nitrogenase and the high-temperature, high-pressure Haber process
2. Wikipedia — conditions and history of the industrial process the challenge aims to beat
3. Nature Chemistry (2011) — Nishibayashi molybdenum pincer catalyst for catalytic ammonia formation