Boulho, C., Gibson, E. K. , McAllister, M. I., Moss, R. and Lennon, D. (2020) The application of attenuated total reflection infrared spectroscopy to investigate the liquid phase hydrogenation of benzaldehyde over an alumina-supported palladium catalyst. Topics in Catalysis, 63, pp. 386-393. (doi: 10.1007/s11244-020-01323-x)
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Abstract
The hydrogenation of benzaldehyde in cyclohexane over a 5 wt% Pd/Al2O3 catalyst at 313 K is firstly investigated at ambient pressure in a stirred batch reactor. The formation of benzyl alcohol is a facile process and a small mass imbalance is indirectly attributed to the formation of benzene as a by-product. No hydrogenolysis reaction to form toluene is observed. Secondly, examination of this reaction system by attenuated total reflection infrared (ATR-IR) spectroscopy enables the chemistry at the liquid/solid interface to be probed. Specifically, the ν(C=O) modes of solvated and adsorbed benzaldehyde are evident at 1712 and 1691 cm−1 respectively, providing information on how the reagent is partitioning within the reaction medium. Spectral acquisition on initiation of hydrogenation then enables the benzaldehyde → benzyl alcohol transition to be tracked. The additional presence of a broad CO stretching band of chemisorbed carbon monoxide (1852–1929 cm−1) is attributed to the hydrogen-assisted decarbonylation pathway that forms the benzene by-product.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | McAllister, Miss Mairi and Boulho, Dr Cedric and Gibson, Dr Emma and Lennon, Professor David |
| Authors: | Boulho, C., Gibson, E. K., McAllister, M. I., Moss, R., and Lennon, D. |
| College/School: | College of Science and Engineering > School of Chemistry |
| Journal Name: | Topics in Catalysis |
| Publisher: | Springer |
| ISSN: | 1022-5528 |
| ISSN (Online): | 1572-9028 |
| Copyright Holders: | Copyright © 2020 The Authors |
| First Published: | First published in Topics in Catalysis 63:386–393 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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