Kinetic analysis to describe co-operative redox enhancement effects exhibited by bimetallic Au-Pd systems in aerobic oxidation

Daniel, Isaac T., Zhao, Liang, Bethell, Donald, Douthwaite, Mark, Pattisson, Samuel, Lewis, Richard J., Akdim, Ouardia, Morgan, David J. ORCID: https://orcid.org/0000-0002-6571-5731, McIntosh, Steven and Hutchings, Graham J. ORCID: https://orcid.org/0000-0001-8885-1560 2022. Kinetic analysis to describe co-operative redox enhancement effects exhibited by bimetallic Au-Pd systems in aerobic oxidation. Catalysis Science & Technology 10.1039/D2CY01474B

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Abstract

Recent work has demonstrated that for bimetallic Au–Pd systems, the rate of catalytic alcohol and formyl dehydrogenation (DH) is intrinsically linked to the rate of oxygen reduction (ORR) within the same system. Herein, the rate enhancement as a result of the coupling between these two processes is assessed via kinetic analysis for the oxidative dehydrogenation of 5-hydroxymethylfurfural. The influence of the Au and Pd molar ratio is explored for a physical mixture of carbon-supported catalysts by changing the mass of each 1 wt% catalyst. Importantly, the activity of the bimetallic system exceeds the sum of the monometallic analogues, at all molar ratios. It is shown that by considering the coupling between two individual reactions (DH and ORR), the kinetic analysis of the system predicts where the maxima in monometallic and bimetallic activity will be observed. The accuracy of the model provides further evidence and understanding of cooperative redox enhancement (CORE) effects observed in bimetallic, heterogeneous catalytic systems.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	Royal Society of Chemistry
ISSN:	2044-4753
Funders:	EPSRC National Facility for XPS (�HarwellXPS�), Wolfson Foundation and Welsh Government
Date of First Compliant Deposit:	2 December 2022
Date of Acceptance:	9 November 2022
Last Modified:	05 Jan 2024 04:43
URI:	https://orca.cardiff.ac.uk/id/eprint/154617

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