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Open AccessArticle

Process Intensification of Alkynol Semihydrogenation in a Tube Reactor Coated with a Pd/ZnO Catalyst

by 1,2, 2 and 1,2,3,*
1
School of Engineering, University of Warwick, Coventry CV4 7AL, UK
2
Stoli Catalysts Ltd., Coventry CV3 4DS, UK
3
Department of Biotechnology and Chemistry, Tver State Technical University, Nab. A. Nikitina 22, 170026 Tver, Russia
*
Author to whom correspondence should be addressed.
Catalysts 2017, 7(12), 358; https://doi.org/10.3390/catal7120358
Received: 26 October 2017 / Revised: 16 November 2017 / Accepted: 20 November 2017 / Published: 25 November 2017
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 H2 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 105 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. View Full-Text
Keywords: palladium; hydrogenation; selectivity; acetylene; ethylene; Lindlar; flow chemistry; process intensification palladium; hydrogenation; selectivity; acetylene; ethylene; Lindlar; flow chemistry; process intensification
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MDPI and ACS Style

Cherkasov, N.; Bai, Y.; Rebrov, E. Process Intensification of Alkynol Semihydrogenation in a Tube Reactor Coated with a Pd/ZnO Catalyst. Catalysts 2017, 7, 358.

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