Ammonia goes green in carbon-free energy demonstrator

The Green Ammonia Energy Storage Demonstrator, developed by Siemens alongside the Science and Technology Facilities Council and the Universities of Oxford and Cardiff, with funding from Innovate UK, is designed to show the complete cycle of renewable power, storage as ammonia, and conversion back to electricity.

Powered by renewable energy, the device first extracts nitrogen from the air and uses electrolysis to separate hydrogen from water, according to Ian Wilkinson, programme manager at Siemens Corporate Technologies.

The two elements are then combined using the Haber-Bosch process, in which hydrogen and nitrogen are reacted under high temperature and pressure in the presence of a catalyst, to produce ammonia.

“We already know how to synthesise ammonia in big quantities, store it, and transport it; the infrastructure is already there,” said Wilkinson.

However, existing techniques to produce ammonia typically rely on the use of natural gas or other fossil fuels, meaning they generate large amounts of carbon dioxide.