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Demonstrating a 2-stroke and 4-stroke large scale ammonia marine engine

Project description

Demonstrating the benefits of ammonia as a no-carbon shipping fuel

Accelerating shipping decarbonisation is a key pillar of the European Green Deal and of achieving carbon neutrality by 2050. ‘Green’ ammonia (NH3) has been gaining interest over the last decade as a fuel for transportation. Unlike conventional hydrocarbons based on fossil fuels, NH3 has no carbon atoms so its combustion generates no CO2 emissions. The ambitious EU-funded Ammonia2-4 project will develop and demonstrate a four-stroke and a two-stroke dual-fuel marine engine running on ammonia as the main fuel. The four-stroke will be a new engine while the two-stroke can be retrofitted to any commercially available two-stroke engine. The two engines have the potential to reduce greenhouse gas emissions by at least 80 % including nitrous oxide emissions.


The overall aim of the Ammonia2-4 project is to demonstrate at full scale two types of dual fuel marine engines running on ammonia as main fuel: (i) a four-stroke and (ii) a two-stroke engine. The proposed four-stroke innovation is a newbuild 10MW engine to be demonstrated in lab conditions closely mimicking real-life operations in ambient conditions. The proposed two-stroke innovation is a medium-pressure ammonia fuel injection platform that can be retrofitted onto any two-stroke marine engine available in the market today. It will be demonstrated in the project at two stages: a lab demonstration followed by retrofitting onto a container vessel of the alpha customer MSC. Both engine innovations are expected to result in at least 80% less GHG emissions (including nitrous oxide emissions), NOx emissions below IMO Tier III regulations and a negligible ammonia slip below 10ppm. By demonstrating both engine types at full scale the project partners are aiming for commercial exploitation of the project results towards more than 90% of the maritime intercontinental transport in terms of gross tonnage, including retrofits and newbuilds to enter the fleet within the next ten years. It is expected that both Ammonia2-4 innovations will lead to an annual reduction of CO2 emitted by deep sea vessels calling at EU ports by 2.3 million tons, and reduce the emissions of harmful pollutants such as SOx by 15 tons annually. The project will go beyond purely technological developments and investigate a number of non-technical aspects crucial for a successful uptake of ammonia as marine fuel: health & safety, ammonia supply infrastructure, crew training & acceptance, but also novel standardisation pathways for regulating emissions from ammonia marine engines.



Net EU contribution
€ 2 743 167,75
Bagnoli della rosandra 334
34018 San dorligo della valle

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Nord-Est Friuli-Venezia Giulia Trieste
Activity type
Private for-profit entities (excluding Higher or Secondary Education Establishments)
Other funding
€ 1 828 778,50

Participants (6)

Partners (1)