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Article Dans Une Revue International Journal of Hydrogen Energy Année : 2023

Evaluation of acetophenone as a novel alcohol-cycloalkane bifunctional liquid organic hydrogen carrier (LOHC)

Résumé

In this contribution, we propose the couple 1-Cyclohexylethanol/Acetophenone as a new biobased and bifunctional LOHC. This material shows promises for hydrogen storage by DFT modelling, while commercial catalysts were identified to carry out both hydrogenation and dehydrogenation: Ru/Al2O3 was found to catalyse the complete hydrogenation of the LOHC at 115 °C in 2 h with 98% selectivity and, for the first time, Pt/C carries out the dehydrogenation at 205 °C in 36 h with total conversion but with a limited Degree of Dehydrogenation of 72%. The system was cycled three times during which up to 50% of the total hydrogen capacity was exploited, stable after 3 cycles. Kinetics experiments and DFT modelling of the reactions intermediates show that a system pairing C–O and C–C bonds is prone to degradation, due to side-reactions initiated by the O-moiety and the reversible hydrogenation of the Cdouble bondO bond during the dehydrogenation step.

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Chimie
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cea-04440528 , version 1 (06-02-2024)

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Florian d'Ambra, Julia Levy, Parviz Hajiyev, Thibault Cantat, Gérard Gébel, et al.. Evaluation of acetophenone as a novel alcohol-cycloalkane bifunctional liquid organic hydrogen carrier (LOHC). International Journal of Hydrogen Energy, 2023, 48 (85), pp.33207-33222. ⟨10.1016/j.ijhydene.2023.05.024⟩. ⟨cea-04440528⟩
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