Controlling the duality of the mechanism in liquid-phase oxidation of benzyl alcohol catalysed by supported Au-Pd nanoparticles

Meenakshisundaram, Sankar ORCID: https://orcid.org/0000-0002-7105-0203, Nowicka, Ewa ORCID: https://orcid.org/0000-0001-7449-2720, Tiruvalam, R., He, Qian ORCID: https://orcid.org/0000-0003-4891-3581, Taylor, Stuart H. ORCID: https://orcid.org/0000-0002-1933-4874, Kiely, Christopher John ORCID: https://orcid.org/0000-0001-5412-0970, Bethel, D., Knight, David William and Hutchings, Graham John ORCID: https://orcid.org/0000-0001-8885-1560 2011. Controlling the duality of the mechanism in liquid-phase oxidation of benzyl alcohol catalysed by supported Au-Pd nanoparticles. Chemistry - A European Journal 17 (23) , pp. 6524-6532. 10.1002/chem.201003484

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Abstract

In the solvent-free oxidation of benzyl alcohol to benzaldehyde using supported gold-palladium nanoparticles as catalysts, two pathways have been identified as the sources of the principal product, benzaldehyde. One is the direct catalytic oxidation of benzyl alcohol to benzaldehyde by O2, whereas the second is the disproportionation of two molecules of benzyl alcohol to give equal amounts of benzaldehyde and toluene. Herein we report that by changing the metal oxide used to support the metal-nanoparticles catalyst from titania or niobium oxide to magnesium oxide or zinc oxide, it is possible to switch off the disproportionation reaction and thereby completely stop the toluene formation. It has been observed that the presence of O2 increases the turnover number of this disproportionation reaction as compared to reactions in a helium atmosphere, implying that there are two catalytic pathways leading to toluene. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Subjects:	Q Science > QD Chemistry
Uncontrolled Keywords:	bascitiy/acidity; Benzyl alcohol; Catalytic pathways; Disproportionation reactions; Disproportionations; gold-palladium nanoparticles; Helium atmosphere; Liquid-phase oxidation; Metal oxides; Solvent-free oxidation; support effect; Titania; Turnover number, Aldehydes; Catalysts; Gold; Helium; Magnesium; Metallic compounds; Nanoparticles; Niobium; Niobium oxide; Oxidation; Palladium; Titanium dioxide; Toluene; Zinc oxide, Catalytic oxidation
Publisher:	Wiley
ISSN:	0947-6539
Last Modified:	07 Nov 2024 22:17
URI:	https://orca.cardiff.ac.uk/id/eprint/10220

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