Hydrogen transfer processes mediated by supported iridium oxide nanoparticles

Hammond, Ceri ORCID: https://orcid.org/0000-0002-9168-7674, Schuemperli, Martin T., Conrad, Sabrina and Hermans, Ive 2013. Hydrogen transfer processes mediated by supported iridium oxide nanoparticles. ChemCatChem 5 (10) , pp. 2983-2990. 10.1002/cctc.201300253

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Abstract

Homogeneous iridium catalysts have demonstrated exceptional catalytic activity for a number of hydrogen transfer reactions. Herein, we demonstrate the synthesis of a heterogeneous iridium catalyst supported on nanoparticulate cerium oxide and investigate its application for the aerobic oxidation of benzyl alcohol and the Meerwein–Ponndorf–Verley transfer hydrogenation of cyclohexanone. Along with the optimisation of the activity of the catalyst, the kinetic parameters have been examined to unravel the elementary reaction steps mediated by this catalyst and further rationalise the observed structure–activity relationships. Both spectroscopic and catalytic investigations suggest that iridium oxide nanoparticles, most likely Ir2O3, mediate these reactions via the formation of metal hydroxide species, which are subsequently reoxidised with either a molecular oxygen or a ketone. In contrast to many other metal- or metal oxide-based catalysts, this catalyst can perform the selective oxidation of alcohols in the absence of a base, at mild temperatures and at a low metal loading.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Subjects:	Q Science > QD Chemistry
Uncontrolled Keywords:	elimination; heterogeneous catalysis; iridium; oxidation; hydrogenation
Publisher:	Wiley
ISSN:	1867-3880
Last Modified:	25 Oct 2022 09:10
URI:	https://orca.cardiff.ac.uk/id/eprint/57518

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