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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.


I.V. Yentekakis

G. Goula

S. Kampouri

I. Betsi-argyropoulou

P. Panagiotopoulou

G. Kyriakou

R.M. Lambert


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.


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. doi: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
Keywords Nitrous oxide decomposition; Thermal aging; Nanoparticles sintering; Ostwald ripening; Oxygen storage capacity; Ceria
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