Allan, M;
Grinter, D;
Dhaliwall, S;
Muryn, C;
Forrest, T;
Maccherozzi, F;
Dhesi, SS;
(2019)
Redox behaviour of a ceria–zirconia inverse model catalyst.
Surface Science
, 682
pp. 8-13.
10.1016/j.susc.2018.12.005.
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Abstract
The redox behaviour modification following the addition of zirconia to ceria nanostructures supported on Rh(111) has been investigated using a combination of Low Energy Electron Diffraction (LEED) and X-ray Photoemission Electron Microscopy (XPEEM). Soft X-ray irradiation was employed to reduce ZrO2-x(111) supported on Rh(111) and, by introducing oxygen, the reoxidation process of the thin film was monitored. CeO2(111) was then deposited on zirconia/Rh(111) and, using XPEEM, we determined that the mixed metal oxide formed a phase-separated structure with CeO2(111) nanoparticles on top of the zirconia. Upon exposure of CeO2-x/ZrO2-x/Rh(111) to X-ray illumination, the zirconia no longer undergoes any observable reduction while at the same time the ceria is reduced. Our results indicate a synergy between the zirconia and ceria in the phase-separated system expected in the working catalyst, with oxygen transfer between the metal oxides. This sheds light on the mechanism of the enhancement of catalytic properties seen with the addition of zirconia to ceria and highlights the oxygen storage and release ability of ceria.
| Type: | Article |
|---|---|
| Title: | Redox behaviour of a ceria–zirconia inverse model catalyst |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.susc.2018.12.005 |
| Publisher version: | https://doi.org/10.1016/j.susc.2018.12.005 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Ceria-zirconia, Redox, X-ray photoelectron microscopy, Oxygen transfer |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10063835 |
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