The effect of heat treatment on the performance and structure of carbon-supported Au-Pd catalysts for the direct synthesis of hydrogen peroxide

Edwards, Jennifer Kelly ORCID: https://orcid.org/0000-0003-4089-2827, Pritchard, James Charles, Piccinini, Marco ORCID: https://orcid.org/0000-0002-8479-4164, Shaw, Greg, He, Qian ORCID: https://orcid.org/0000-0003-4891-3581, Carley, Albert Frederick, Kiely, Christopher John ORCID: https://orcid.org/0000-0001-5412-0970 and Hutchings, Graham John ORCID: https://orcid.org/0000-0001-8885-1560 2012. The effect of heat treatment on the performance and structure of carbon-supported Au-Pd catalysts for the direct synthesis of hydrogen peroxide. Journal of Catalysis 292 , pp. 227-238. 10.1016/j.jcat.2012.05.018

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Abstract

The direct synthesis of hydrogen peroxide using supported gold palladium catalysts prepared by incipient wetness impregnation is described and discussed. The effect of an acid pre-treatment step on the activated carbon support prior to the deposition of the metals, together with the effect of the calcination temperature, has been investigated. The acid pre-treated samples all show superior activity to those materials prepared with the omission of this acid pre-treatment stage. The calcination temperature affects both the re-usability and hydrogenation activity of the catalysts. Detailed characterisation using X-ray photoelectron spectroscopy and aberration-corrected scanning transmission electron microscopy is described. The enhanced activity is associated with a higher surface concentration of palladium in the acid pre-treated samples which is principally present as Pd2+. Calcination of the catalysts at 400 °C is required to achieve re-usable and stable catalysts, and this is associated with the morphology and dispersion of the metal nanoparticles. The surface ratio of Pd0/Pd2+ is found to be an important factor controlling the hydrogenation of hydrogen peroxide, and a series of controlled reduction and re-oxidation of a sample show how the Pd0/Pd2+ surface ratio can influence the relative rates of hydrogen peroxide synthesis and hydrogenation.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Subjects:	Q Science > QD Chemistry
Uncontrolled Keywords:	Gold palladium nanoparticles; Hydrogen peroxide direct synthesis; Aberration-corrected microscopy
Publisher:	Elsevier
ISSN:	0021-9517
Last Modified:	11 Oct 2023 22:02
URI:	https://orca.cardiff.ac.uk/id/eprint/35907

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