Ir-Catalysed Nitrous Oxide (N2O) Decomposition: Effect of Ir Particle Size and Metal–Support Interactions

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.

Publication DOI: https://doi.org/10.1007/s10562-017-2233-z
Dataset DOI: https://doi.org/10.17036/researchdata.aston.ac.uk.00000302
Divisions: College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Chemical Engineering & Applied Chemistry
College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > Energy and Bioproducts Research Institute (EBRI)
Additional Information: © Springer Science+Business Media, LLC 2017. Funding: Technical University of Crete, Aston University PhD scholarship, Royal Society and EPSRC.
Uncontrolled Keywords: Nitrous oxide decomposition Thermal aging Nanoparticles sintering Ostwald ripening Oxygen storage capacity Ceria
Full Text Link: http://link.spr ... 0562-017-2233-z
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PURE Output Type: Article
Published Date: 2017-11-13
Published Online Date: 2017-11-13
Accepted Date: 2017-10-25
Authors: Yentekakis, I. V.
Goula, G.
Kampouri, S.
Betsi-argyropoulou, I.
Panagiotopoulou, P.
Taylor, M. J.
Kyriakou, G.
Lambert, R. M.

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