Process intensification of alkynol semihydrogenation in a tube reactor coated with a Pd/ZnO catalyst


Semihydrogenation of 2-methyl-3-butyn-2-ol (MBY) was studied in a 5 m tube reactor wall-coated with a 5 wt % Pd/ZnO catalyst. The system allowed for the excellent selectivity towards the intermediate alkene of 97.8 ± 0.2% at an ambient H 2 pressure and a MBY conversion below 90%. The maximum alkene yield reached 94.6% under solvent-free conditions and 96.0% in a 30 vol % MBY aqueous solution. The reactor stability was studied for 80 h on stream with a deactivation rate of only 0.07% per hour. Such a low deactivation rate provides a continuous operation of one month with only a two-fold decrease in catalyst activity and a metal leaching below 1 parts per billion (ppb). The excellent turn-over numbers (TON) of above 10 5 illustrates a very efficient utilisation of the noble metal inside catalyst-coated tube reactors. When compared to batch operation at 70 °C, the reaction rate in flow reactor can be increased by eight times at a higher reaction temperature, keeping the same product decomposition of about 1% in both cases.

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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: The continuous flow hydrogenation allows for a significant process intensification by increasing  The continuous flow hydrogenation allows for a significant process intensification by increasing the process temperature by 90 ◦°C above that used in a conve
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: Acetylene,Ethylene,Flow chemistry,Hydrogenation,Lindlar,Palladium,Process intensification,Selectivity,Catalysis,Physical and Theoretical Chemistry
Publication ISSN: 2073-4344
Last Modified: 15 Jul 2024 07:56
Date Deposited: 12 Jul 2019 15:11
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2017-11-25
Accepted Date: 2017-11-20
Authors: Cherkasov, Nikolay
Bai, Yang (ORCID Profile 0000-0002-8050-5716)
Rebrov, Evgeny



Version: Published Version

License: Creative Commons Attribution

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