Highly selective continuous flow hydrogenation of cinnamaldehyde to cinnamyl alcohol in a Pt/SiO2 coated tube reactor


A novel continuous flow process for selective hydrogenation of α, β-unsaturated aldehyde (cinnamaldehyde, CAL) to the unsaturated alcohol (cinnamyl alcohol, COL) has been reported in a tube reactor coated with a Pt/SiO2 catalyst. A 90% selectivity towards the unsaturated alcohol was obtained at the aldehyde conversion of 98.8%. This is a six-fold improvement in the selectivity compared to a batch process where acetals were the main reaction products. The increased selectivity in the tube reactor was caused by the suppression of acid sites responsible for the acetal formation after a short period on stream in the continuous process. In a fixed bed reactor, it had a similar acetal suppression phenomenon but showed lower product selectivity of about 47–72% due to mass transfer limitations. A minor change in selectivity and conversion caused by product inhibition was observed during the 110 h on stream with a turnover number (TON) reaching 3000 and an alcohol production throughput of 0.36 kg gPt −1 day−1 in the single tube reactor. The catalysts performance after eight reaction cycles was fully restored by calcination in air at 400◦C. The tube reactors provide an opportunity for process intensification by increasing the reaction rates by a factor of 2.5 at the reaction temperature of 150◦C compared to 90◦C with no detrimental effects on catalyst stability or product selectivity.

Publication DOI: https://doi.org/10.3390/catal8020058
Divisions: College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Chemical Engineering & Applied Chemistry
College of Engineering & Physical Sciences > Energy and Bioproducts Research Institute (EBRI)
Funding Information: Acknowledgments: The authors are grateful to Jonathan Strong for the ICP and TEM analysis, Guannan Hu for the SEM study of the Pt/SiO2 catalyst. We also acknowledge the support of the European Research Council Proof of Concept grant (project Micarf 693739
Additional Information: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
Uncontrolled Keywords: Alcohol,Catalyst-coated,Flow chemistry,Hydrogenation,Platinum,Selectivity,Stability,Tube reactor,Unsaturated aldehyde,Catalysis,Physical and Theoretical Chemistry
Publication ISSN: 2073-4344
Last Modified: 12 Feb 2024 08:28
Date Deposited: 12 Jul 2019 14:39
Full Text Link:
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
https://www.mdp ... 073-4344/8/2/58 (Publisher URL)
PURE Output Type: Article
Published Date: 2018-02-02
Accepted Date: 2018-01-29
Authors: Bai, Yang (ORCID Profile 0000-0002-8050-5716)
Cherkasov, Nikolay
Huband, Steven
Walker, David
Walton, Richard I.
Rebrov, Evgeny



Version: Published Version

License: Creative Commons Attribution

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