Ultrasound-assisted selective hydrogenation of C-5 acetylene alcohols with Lindlar catalysts

Tripathi, Bhavana; Paniwnyk, Larysa; Cherkasov, Nikolay; Ibhadon, Alex O.; Lana Villarreal, Teresa; Gómez, Roberto

Abstract

The selective hydrogenation of 2-methyl-3-butyn-2-ol (MBY) was performed in the presence of Lindlar catalyst, comparing conventional stirring with sonication at different frequencies of 40, 380 and 850 kHz. Under conventional stirring, the reaction rates were limited by intrinsic kinetics, while in the case of sonication, the reaction rates were 50–90% slower. However, the apparent reaction rates were found to be significantly frequency dependent with the highest rate observed at 40 kHz. The original and the recovered catalysts after the hydrogenation reaction were compared using bulk elemental analysis, powder X-ray diffraction and scanning and transmission electron microscopy coupled with energy-dispersive X-ray analysis. The studies showed that sonication led to the frequency-dependent fracturing of polycrystalline support particles with the highest impact caused by 40 kHz sonication, while monocrystals were undamaged. In contrast, the leaching of Pd/Pb particles did not depend on the frequency, which suggests that sonication removed only loosely-bound catalyst particles.

Citation

Tripathi, B., Paniwnyk, L., Cherkasov, N., Ibhadon, A. O., Lana Villarreal, T., & Gómez, R. (2015). Ultrasound-assisted selective hydrogenation of C-5 acetylene alcohols with Lindlar catalysts. Ultrasonics Sonochemistry, 26, 445-451. https://doi.org/10.1016/j.ultsonch.2015.03.006

• Acceptance Date: Mar 6, 2015
• Online Publication Date: Mar 12, 2015
• Publication Date: 2015-09
• Deposit Date: Apr 5, 2017
• Publicly Available Date: Apr 5, 2017
• Journal: Ultrasonics sonochemistry
• Print ISSN: 1350-4177
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 26
• Pages: 445-451
• DOI: https://doi.org/10.1016/j.ultsonch.2015.03.006
• Keywords: Ultrasound; Semihydrogenation; Lindlar catalyst; Alkynol; Palladium
• Public URL: https://hull-repository.worktribe.com/output/450393
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S1350417715000681
• Additional Information: This is the author's accepted manuscript of an article published in Ultrasonics sonochemistry, 2015, v.26.
• Contract Date: Apr 5, 2017