Ir-Catalysed nitrous oxide (N2O) decomposition: effect of Ir particle size and metal–support interactionsIr-Catalysed nitrous oxide (N2O) decomposition: effect of Ir particle size and metal–support interactions Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2019-11-142018enThe 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.http://creativecommons.org/licenses/by/4.0/Catalysis Letters1481341-347 Gentekakis Ioannis Γεντεκακης Ιωαννης Goula Grammatiki Γουλα Γραμματικη Betsi-Argyropoulou Ioanna-Idyli Μπετση-Αργυροπουλου Ιωαννα-Ηδυλη Panagiotopoulou Paraskevi Παναγιωτοπουλου Παρασκευη Taylor Martin J. Kyriakou Georgios Lambert Richard M. Kabouri Stavroula Καμπουρη Σταυρουλα Springer Nature [academic journals on nature.com] Ceria Nanoparticles sintering Nitrous oxide decomposition Ostwald ripening Oxygen storage capacity Thermal aging