What is the difference between green hydrogen & green ammonia?


Ammonia is a hydrogen carrier, just like diesel, and the molecule is formed by 1x nitrogen atom and 3x hydrogen atoms. Green ammonia is produced by the Haber-Bosch process which combines nitrogen from the air and green hydrogen.

Why green ammonia?

Since hydrogen is the smallest and lightest molecule in the universe, it is not easily stored in large quantities. High pressured vessels or cryogenic tanks are required, making it only economical for smaller storage sizes. ammonia is in this respect a good solution as a carrier for hydrogen as it is easier to store, meaning that ammonia can be used as a more dense energy carrier.

CMB.TECH's dual fuel technology uses hydrogen on landside applications and smaller coastal vessels which have the possibility to refuel the hydrogen every two to three days. However, large ocean-going vessels do not have this possibility and thus green ammonia will be used resulting in longer autonomy with the same volume of storage.