Ir-catalysed N2O decomposition effect of Ir particle size and metal support interactions

Yentekakis, I.V.; Goula, G.; Kampouri, S.; Betsi-argyropoulou, I.; Panagiotopoulou, P.; Taylor, M.J.; Kyriakou, G.; Lambert, R.M.

Abstract

The effect of the morphology of Ir particles supported on γ-Al2O3, 8 mol%Y2O3-stabilized ZrO2 (YSZ), 10 mol%Gd2O3-doped CeO2 (GDC) and 80 wt%Al2O3–10 wt%CeO2–10 wt%ZrO2 (ACZ) on their stability on oxidative conditions, the associated metal–support interactions and activity for catalytic decomposition of N2O has been studied. Supports with intermediate or high oxygen ion lability (GDC and ACZ) effectively stabilized Ir nanoparticles against sintering, in striking contrast to supports offering negligible or low oxygen ion lability (γ-Al2O3 and YSZ). Turnover frequency studies using size-controlled Ir particles showed strong structure sensitivity, de-N2O catalysis being favoured on large catalyst particles. Although metallic Ir showed some de-N2O activity, IrO2 was more active, possibly present as a superficial overlayer on the iridium particles under reaction conditions. Support-induced turnover rate modifications, resulted from an effective double layer [Oδ−–δ+](Ir) on the surface of iridium nanoparticles, via O2− backspillover from the support, were significant in the case of GDC and ACZ.

Citation

Yentekakis, I., Goula, G., Kampouri, S., Betsi-argyropoulou, I., Panagiotopoulou, P., Taylor, M., …Lambert, R. (2018). Ir-catalysed N2O decomposition effect of Ir particle size and metal support interactions. Catalysis Letters, 148(1), 341-347. https://doi.org/10.1007/s10562-017-2233-z

• Journal Article Type: Article
• Acceptance Date: Oct 25, 2017
• Online Publication Date: Nov 13, 2017
• Publication Date: Jan 1, 2018
• Deposit Date: Dec 5, 2018
• Publicly Available Date: Dec 5, 2018
• Print ISSN: 1011-372X
• Electronic ISSN: 1572-879X
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 148
• Issue: 1
• Pages: 341-347
• DOI: https://doi.org/10.1007/s10562-017-2233-z
• Keywords: Nitrous oxide decomposition; Thermal aging; Nanoparticles sintering; Ostwald ripening; Oxygen storage capacity; Ceria
• Public URL: https://hull-repository.worktribe.com/output/1172652
• Publisher URL: https://link.springer.com/article/10.1007/s10562-017-2233-z
• Related Public URLs: https://research.aston.ac.uk/portal/en/researchoutput/ircatalysed-nitrous-oxide-n2o-decomposition-effect-of-ir-particle-size-and-metalsupport-interactions(934ea7fe-150a-485d-b7f0-8e833d47e85f).html