Liquid organic hydrogen
carriers (LOHCs) store hydrogen by covalent
bonds in a safe and dense manner. Recovery of hydrogen is realized
by an endothermal dehydrogenation reaction. Theoretically, its heat
demand could be covered by waste heat, e.g., from a fuel cell. However,
to facilitate this, it is crucial to increase the temperature level
of polymer electrolyte membrane fuel cells and lower the temperature
level of the dehydrogenation reaction. In this study, strategies for
releasing hydrogen from LOHCs at low temperatures are presented and
evaluated. Thereby, the focus is on approaches for overcoming limitations
by the reaction equilibrium. We see three main options: (i) dehydrogenation
at a low pressure, (ii) dilution of hydrogen with an inert gas, and
(iii) reactive distillation. These options are examined, particularly
regarding their suitability for integrating waste heat, e.g., from
fuel cells. Low-pressure dehydrogenation and reactive distillation
show the highest potential for realizing efficient low-temperature
hydrogen release.
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