Hydrogen and ammonia – green marine fuels
Both hydrogen and ammonia can be entirely emission-free fuels. The way they are produced determines their total carbon footprint. The two fuels are related, as ammonia is hydrogen in a chemically bound form. Nevertheless, they have somewhat different properties and application areas.
“You have to use a calculator to calculate which fuel is most suitable for a given operation and ship operational profile. For example, ammonia has higher energy density, so you can get more energy than from hydrogen on larger vessels that sail longer distances. But in cases where weight is important, such as for high-speed vessels, hydrogen may be the most suitable fuel,” explains Økland. She stresses that these are only a few of many factors taken into consideration when choosing a fuel.
As regards ammonia, another important factor is that there are already well-developed and scaled value chains for production and transport in place. This is because ammonia is one of the most important raw materials for manufacturing fertiliser.
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