What is LOHC Storage?

Hydrogen is central to the global clean energy transition, with its ability to decarbonize sectors ranging from transportation to heavy industries. However, efficient hydrogen storage remains a key challenge. Among the various technologies available, Liquid Organic Hydrogen Carriers (LOHCs) have emerged as a promising solution due to their ability to store and transport hydrogen safely and efficiently. This blog explores LOHCs in detail, compares them with pressurized and metal hydride storage technologies, and presents a case study showcasing their real-world application.

Understanding LOHCs

LOHCs are organic compounds that chemically bond with hydrogen, creating a reversible system for hydrogen storage and transport. During hydrogenation, hydrogen reacts with the LOHC at high temperatures in the presence of a catalyst, becoming chemically bonded. The hydrogen can be released through a reverse process called dehydrogenation when needed.

Key Features of LOHC Storage

1. Safety — LOHCs are non-toxic, non-flammable, and remain liquid at ambient temperature and pressure, making them safer compared to high-pressure or cryogenic hydrogen storage methods.
2. Infrastructure Compatibility — LOHCs can leverage existing fossil fuel transport infrastructure, such as tankers and pipelines, reducing the need for specialized hydrogen logistics systems.
3. Reusability — Once dehydrogenated, the carrier can be reused multiple times, offering a sustainable and cost-effective solution.

Comparison of LOHCs with Other Hydrogen Storage Technologies

LOHC storage differs from pressurized hydrogen storage and metal hydride storage across several dimensions — safety profile, infrastructure requirements, energy density, and reusability. LOHCs stand out for operating at ambient pressure and temperature (unlike pressurized gas storage, which requires high-pressure vessels), and for being fully reusable across many cycles (unlike some metal hydride systems, which can degrade over repeated cycling).

Case Study: Hydrogen Transport Using LOHCs in Germany

Background

Hydrogenious LOHC Technologies, a German company, has pioneered LOHC-based hydrogen storage and transport systems. The company partnered with the Port of Rotterdam and EWE, an energy provider, to create a scalable hydrogen transport model using LOHCs.

Implementation

The implementation followed three steps. First, in the hydrogenation process, hydrogen produced via electrolysis from renewable energy sources was bonded with an LOHC (benzyl toluene), allowing the hydrogen to be stored and transported as a stable liquid at ambient conditions. Second, for transportation, the LOHC was moved via conventional liquid fuel tankers from Germany to the Netherlands — unlike compressed hydrogen tanks, which require specialized containers, this method significantly reduced logistical costs. Third, dehydrogenation occurred at the destination: at the Port of Rotterdam, the LOHC underwent dehydrogenation to release hydrogen for use in industrial applications and fueling stations, and the "empty" LOHC was then shipped back for reuse.

Outcomes

LOHC storage proved to be safer and more scalable than pressurized systems for long-distance transport. Utilizing existing fuel transport infrastructure reduced costs significantly, and the system facilitated the large-scale movement of green hydrogen, supporting Europe's decarbonization goals.

Future Implications

This case study demonstrated the potential of LOHCs to overcome hydrogen logistics challenges and integrate seamlessly into existing energy systems. Similar systems could be replicated globally, particularly in regions with strong renewable energy potential but limited hydrogen demand.

Advantages of LOHC Technology

1. Scalability — LOHCs offer a viable solution for large-scale hydrogen storage and transport, critical for expanding global hydrogen economies.
2. Long-Term Storage — Unlike pressurized or metal hydride systems, LOHCs do not suffer from hydrogen leakage or degradation, making them ideal for extended storage periods.
3. Infrastructure Compatibility — By leveraging existing infrastructure, LOHCs avoid the high upfront costs associated with developing new hydrogen logistics networks.
4. Safety and Flexibility — The non-flammable and stable nature of LOHCs makes them suitable for diverse applications, from grid energy storage to international hydrogen trade.

Challenges and Future Developments

While LOHC technology is promising, it faces challenges such as energy intensity — hydrogenation and dehydrogenation processes require high temperatures and catalysts, increasing energy demand. Catalyst costs are also a factor, since developing cost-effective and efficient catalysts remains a priority. Gravimetric efficiency is a limitation too, as the weight of the carrier limits its application in mobile systems like fuel cell vehicles.

Researchers are focusing on improving LOHC efficiency, developing new carrier compounds with higher hydrogen densities, and integrating renewable energy sources to power hydrogenation processes.

The Way Ahead

Liquid Organic Hydrogen Carriers (LOHCs) are redefining hydrogen storage and transport by addressing the limitations of traditional methods like pressurized and metal hydride storage. Their unique features — safety, scalability, and compatibility with existing infrastructure — position them as a critical enabler of the global hydrogen economy.

As demonstrated in the German case study, LOHCs offer a sustainable and cost-effective solution for long-distance hydrogen transport, aligning with international decarbonization goals. With ongoing advancements, LOHC technology could play a pivotal role in accelerating the adoption of hydrogen as a clean energy carrier.