Hydrogen, as a clean energy vector, holds immense potential for decarbonizing industries and transportation. However, storing and transporting this lightweight gas poses significant challenges due to its low volumetric density.
Among the storage solutions available, physical-based technologies – namely, storing hydrogen by raising the pressure (compress gaseous storage) or decreasing the temperature (liquid hydrogen storage) – are today the most established methods for enabling hydrogen transportation.
Compression and liquefaction are surely playing a critical role in building the hydrogen economy. However, along with their specific advantages, they also present limitations that must be considered when discussing how to transport hydrogen.
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Transportation of Compressed Gaseous Hydrogen
Compressed hydrogen storage is the most established and widely used storage method, relying on high-pressure vessels to store hydrogen gas at pressures ranging from 200 to 700 bar. Modern pressure vessels, such as Type III (aluminum-lined composite shell) and Type IV (plastic-lined composite shell), offer lightweight solutions with higher storage densities than traditional steel tanks.
Advantages of compressed hydrogen transportation:
- Flexibility: Ideal for small-scale applications or areas lacking pipeline infrastructure.
- Convenience: Can be easily integrated into existing transportation systems, such as tube trailers and containers.
Challenges of compressed hydrogen transportation:
- Limited Capacity: Trucks carrying compressed hydrogen are constrained by weight and storage capacity, typically transporting only 200–900 kg of hydrogen per trip.
- Cost and Energy Intensity: High-performance materials like carbon fiber make tanks expensive, and compression requires 10–15% of the equivalent energy stored.
- Safety Concerns: Handling high-pressure gas requires rigorous safety measures and regulatory compliance.
Compressed hydrogen offers a flexible solution for short-distance transportation, but its limitations make it less viable for large-scale or long-distance applications.
Transportation of Liquid Hydrogen
Liquefied hydrogen storage involves cooling hydrogen gas to -253°C, transforming it into a dense liquid form that can be stored and transported in cryogenic tanks. With significantly higher volumetric density than compressed hydrogen, liquid hydrogen is ideal for transporting larger quantities over long distances.
Advantages of liquid hydrogen transportation:
- Higher Energy Density: Enables transportation of larger volumes in a compact form.
- Suitability for Long Distances: Well-suited for applications requiring high-capacity delivery.
Challenges of liquid hydrogen transportation:
- Energy-Intensive Liquefaction: The liquefaction process consumes around 40% of the hydrogen’s energy content.
- Boil-Off Losses: Up to 30% of hydrogen can evaporate in transit, requiring timely delivery to minimize losses.
- Safety and Costs: Cryogenic tanks are expensive, and maintaining hydrogen at such low temperatures involves significant infrastructure and operational costs.
Liquid hydrogen storage offers a scalable solution for long-distance transportation but comes at the cost of energy losses and high operational expenses.
Challenging the Status-Quo with Material-Based Hydrogen Storage
While both compressed and liquid hydrogen storage are currently the main enablers of hydrogen transportation, their limitations call for innovative solutions to store and transport hydrogen in a safer, more efficient way.
Material-based storage technologies, including reticular materials such as Metal-Organic Frameworks (MOFs), are emerging as a promising alternative to traditional compressed and liquid hydrogen storage.
H2MOF’s technology, based on nano-engineered reticular materials with exceptional adsorption properties, makes it possible to safely store and transport hydrogen in solid state, at low pressure and near ambient temperature. This results in a significant reduction of costs, since no compression or liquefaction are required, mitigating the safety concerns typically associated with high-pressure gases or cryogenic liquids.
Learn more on the available technologies for hydrogen transportation in our white paper!
