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Blue Ammonia

Blue Ammonia is ammonia (NH₃) produced from natural gas, where the CO₂ generated during production is captured and stored using carbon capture technology.

It is considered a low-carbon marine fuel option for future shipping.

How Blue Ammonia is Produced

1️⃣ Natural gas → converted to hydrogen (via steam methane reforming)
2️⃣ CO₂ produced during process
3️⃣ CO₂ is captured using Carbon Capture and Storage (CCS)
4️⃣ Hydrogen + Nitrogen → Ammonia (NH₃)

Why It Is Called “Blue”?

  • Grey ammonia → CO₂ released to atmosphere

  • Blue ammonia → CO₂ captured & stored

  • Green ammonia → Produced using renewable electricity (no fossil fuel)

Why Shipping Is Interested?

Driven by decarbonization targets set by the
International Maritime Organization

Advantages:

  • No CO₂ emitted during combustion

  • Carbon-free fuel at point of use

  • Suitable for large ocean-going vessels

  • Easier to store than hydrogen

Challenges in Marine Use

⚠️ Toxic and corrosive
⚠️ Requires special fuel systems
⚠️ Lower energy density than HFO
⚠️ NOx emissions must be controlled

Engine Considerations 

  • Modified dual-fuel engines

  • Special fuel pumps and sealing systems

  • Ventilation and gas detection

  • Emergency shutdown systems

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