Fast and Highly Selective Continuous-Flow Catalytic Hydrogenation of a Cafestol–Kahweol Mixture Obtained from Green Coffee Beans
(2020) ACS Omega — Vol. 5, n° 40, p. 25712-25722 (2020)
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- Authors
Itabaiana, Ivaldo 
Rezende, Claudia Moraes
- 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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Citations
Lima, F. A., Bezerra, M. A. M., Souza, R., Itabaiana, I., Haynes, T., Hermans, S., Wojcieszak, R., Novaes, F. J. M., & Rezende, C. M. (2020). Fast and Highly Selective Continuous-Flow Catalytic Hydrogenation of a Cafestol–Kahweol Mixture Obtained from Green Coffee Beans. ACS Omega, 5(40), 25712-25722. https://doi.org/10.1021/acsomega.0c01835 (Original work published 2020)