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

Cherkasov, Nikolay; Bai, Yang; Rebrov, Evgeny

Abstract

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.

Citation

Cherkasov, N., Bai, Y., & Rebrov, E. (2017). Process intensification of alkynol semihydrogenation in a tube reactor coated with a Pd/ZnO catalyst. Catalysts, 7(12), Article 358. https://doi.org/10.3390/catal7120358

• Journal Article Type: Article
• Acceptance Date: Nov 20, 2017
• Online Publication Date: Nov 25, 2017
• Publication Date: Dec 1, 2017
• Deposit Date: Sep 6, 2020
• Publicly Available Date: Jan 25, 2022
• Journal: Catalysts
• Electronic ISSN: 2073-4344
• Publisher: MDPI
• Peer Reviewed: Peer Reviewed
• Volume: 7
• Issue: 12
• Article Number: 358
• DOI: https://doi.org/10.3390/catal7120358
• Keywords: Palladium; Hydrogenation; Selectivity; Acetylene; Ethylene; Lindlar; Flow chemistry; Process intensification
• Public URL: https://hull-repository.worktribe.com/output/3583534
• Publisher URL: https://www.mdpi.com/2073-4344/7/12/358