LOHC stands for Liquid Organic Hydrogen Carrier. These are organic compounds that can store and release hydrogen through reversible chemical reactions, making them a potential solution for hydrogen storage and transport. They are gaining attention due to their ability to use existing fuel infrastructure and offer a safer alternative to high-pressure hydrogen storage.
Here's a more detailed explanation:
Hydrogen Storage and Release:
LOHCs work by hydrogenating (adding hydrogen to) a hydrogen-lean molecule to create a hydrogen-rich molecule, effectively storing hydrogen. When hydrogen is needed, the hydrogen-rich molecule can be dehydrogenated (have hydrogen removed) to release it.
Liquid State:
Both the hydrogen-lean and hydrogen-rich forms of LOHCs are liquid, making them easy to transport and store in existing fuel infrastructure.
Advantages:
Safer and Easier Transport: LOHCs offer a safer and more practical alternative to compressing hydrogen gas for transportation and storage.
Compatibility with Existing Infrastructure: They can utilize existing fuel infrastructure for transportation and storage, reducing the need for new infrastructure development.
High Volumetric Storage: LOHCs can store hydrogen at a higher volumetric density compared to compressed hydrogen gas.
Types of LOHCs:
LOHC systems are often classified into three categories: cycloalkane/aromatic couples, N-heterocyclic compounds, and other molecules.
Examples:
Some examples of LOHCs include dibenzyltoluene/perhydro-dibenzyltoluene, benzene/cyclohexane, and N-ethylcarbazole.
Applications:
LOHCs are being explored for various applications, including:
Hydrogen refueling stations:
Hydrogen-powered ships and trains:
Large-scale hydrogen import and distribution:
International hydrogen transport:
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