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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

Authors

Bhavana Tripathi

Larysa Paniwnyk

Nikolay Cherkasov

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Dr Alex Ibhadon A.O.Ibhadon@hull.ac.uk
Reader in Catalysis and Reactor Engineering

Teresa Lana Villarreal

Roberto Gómez



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
Electronic ISSN 1873-2828
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.

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