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Fast and Highly Selective Continuous-Flow Catalytic Hydrogenation of a Cafestol–Kahweol Mixture Obtained from Green Coffee Beans

Abstract : This work investigates batch and continuous-flow heterogeneous catalytic hydrogenation of a mixture of cafestol and kahweol (C&K) to obtain pure cafestol. These diterpenes were extracted from green coffee beans, and hydrogenation was performed using well-established palladium catalysts (Pd/C, Pd/CaCO3, Pd/BaSO4, and Pd/Al2O3) and a carbon black-supported Pd catalyst coated by a covalently tethered SiO2 shell with mesoporous texture (Pd/CB@SiO2), all partially deactivated with quinoline. Pd/C 10% poisoned with 1 wt % quinoline gave the best result for batch reaction, producing cafestol from kahweol with high selectivity (>99%) after 10 min. Excellent selectivity was also obtained with the catalyst Pd/CB@SiO2 with only 1% Pd. In addition, Pd/C-quinoline adapted for continuous-flow experiments exhibited the best catalytic activity, also providing cafestol with excellent selectivity (>99%) after 9.8 s.
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https://hal.univ-lille.fr/hal-03024504
Contributeur : Lilloa Université de Lille <>
Soumis le : mercredi 25 novembre 2020 - 19:16:43
Dernière modification le : mercredi 17 février 2021 - 09:56:08
Archivage à long terme le : : vendredi 26 février 2021 - 20:20:07

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Fernanda Alves Lima, Marco A. M. Bezerra, Rodrigo Souza, Ivaldo Itabaiana, Tommy Haynes, et al.. Fast and Highly Selective Continuous-Flow Catalytic Hydrogenation of a Cafestol–Kahweol Mixture Obtained from Green Coffee Beans. ACS Omega, ACS Publications, 2020, 5 (40), pp.25712-25722. ⟨10.1021/acsomega.0c01835⟩. ⟨hal-03024504⟩

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