Greener fertilisers are coming your way. James T M Towill, CC BY-SA Researchers have developed a method to produce ammonia simply from air and water. Not only is it more energy efficient than the century-old Haber-Bosch process currently in use all over the world, but it is also greener. Ammonia – made up of three parts hydrogen and one part nitrogen (or NH3) – has had a momentous impact on society. Without the mass production of this chemical, it is estimated that as many as a third of us won’t be alive. This is because its main use is to make fertilisers, which have helped improve crop yields and sustain a large population. Developed in 1909, the Haber-Bosch process – often cited as themost important invention of the 20th century – involves heating purified nitrogen and hydrogen gas at very high temperature and pressure in presence of an iron catalyst. The presence of the catalyst, which doesn’t take part in the reaction but lowers the energy threshold of the reaction, is vital. Despite which, ammonia’s production – about 140m tons in 2012 – consumes nearly 2% of the world’s energy supply. Apart from large energy requirements to achieve reaction conditions, the current production method is inefficient because it needs hydrogen gas, which
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