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: | Schools > Chemistry Research Institutes & Centres > 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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