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Highly selective continuous flow hydrogenation of cinnamaldehyde to cinnamyl alcohol in a Pt/SiO2 coated tube reactor
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Bai, Yang, Cherkasov, Nikolay, Huband, Steven, Walker, David, Walton, Richard I. and Rebrov, Evgeny V. (2018) Highly selective continuous flow hydrogenation of cinnamaldehyde to cinnamyl alcohol in a Pt/SiO2 coated tube reactor. Catalysts, 8 (2). 58. doi:10.3390/catal8020058 ISSN 2073-4344.
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Official URL: http://dx.doi.org/10.3390/catal8020058
Abstract
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.
Item Type: | Journal Article | |||||||||
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Subjects: | T Technology > TP Chemical technology | |||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry Faculty of Science, Engineering and Medicine > Engineering > Engineering Faculty of Science, Engineering and Medicine > Science > Physics |
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Library of Congress Subject Headings (LCSH): | Aldehydes -- Reactivity, Hydrogenation, Flow chemistry, Platinum | |||||||||
Journal or Publication Title: | Catalysts | |||||||||
Publisher: | MDPI | |||||||||
ISSN: | 2073-4344 | |||||||||
Official Date: | 2 February 2018 | |||||||||
Dates: |
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Volume: | 8 | |||||||||
Number: | 2 | |||||||||
Article Number: | 58 | |||||||||
DOI: | 10.3390/catal8020058 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||
Date of first compliant deposit: | 9 February 2018 | |||||||||
Date of first compliant Open Access: | 12 February 2018 | |||||||||
RIOXX Funder/Project Grant: |
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