According to the World Platinum Investment Council, there are signs that a global market in green hydrogen or green hydrogen derivatives is emerging, with more than 80 announcements made between 2020 and 2021 for projects or collaborations that relate to global hydrogen or ammonia trade.

Based on these announcements, the most active prospective importers are Germany, Japan and the Netherlands, with the most active prospective exporter being Australia.

The focus on strengthening Europe’s long-term sustainable security of energy supply has provided additional impetus to the aim of boosting the region’s future hydrogen capability and availability.

A recent report on the global hydrogen trade outlook to 2050 issued by the International Renewable Energy Agency showed that the use of green hydrogen as an energy carrier is set to provide a way of transporting renewable electricity over long distances, linking low-cost production sites – regions with an abundance of wind or solar power – with demand centres that need to import green hydrogen.

Hydrogen – especially emissions-free green hydrogen – is an important source of energy for achieving a carbon-neutral economy. To produce green hydrogen, renewable energy is converted into hydrogen through electrolysis, with platinum-based proton exchange membrane (PEM) electrolysers forming a key technology.

The production of green hydrogen could grow by almost five times to 614-million tonnes a year between now and 2050 to satisfy clean energy demands. The global capacity for electrolysers producing green hydrogen needed to meet this demand is forecast to increase from the 300 MW installed now to about 5 000 GW in 2050.

However, this growth potential is predicated on the establishment of a global trade in green hydrogen as a commodity.

Today, the transportation and storage of hydrogen is mainly based on compressed hydrogen, which, owing to its low density, needs to be stored at either extremely high pressures of between 350 bar and 700 bar, or as a liquid at extremely low temperatures of about –253 ºC, requiring specialist handling.

An alternative is to first transform the hydrogen into a commodity with a higher density by volume that is easier and more cost-effective to transport, for example ammonia.

Ammonia gas can be stored as a liquid at room temperature under a pressure of just 10 bar, or under atmospheric pressure at –33 ºC. More than 125-million tonnes of ammonia is produced globally every year and processed into fertiliser in agriculture or used in chemical processes, among other things.

Using ammonia as a carrier to transport hydrogen enables the use of existing, well-developed supply chain infrastructure and trading mechanisms.