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

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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.

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Acknowledgements

IVY acknowledges Technical University of Crete for partial financial support. MJT acknowledges Aston University for a PhD scholarship. GK acknowledges funding from the Royal Society and EPSRC. The authors would like to thank Dr C.M.A. Parlett and Dr M.A. Isaacs for their kind assistance with the TEM measurements.

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Authors and Affiliations

  1. School of Environmental Engineering, Technical University of Crete, 73100, Chania, Crete, Greece

    I. V. Yentekakis, G. Goula, S. Kampouri, I. Betsi-Argyropoulou & P. Panagiotopoulou

  2. European Bioenergy Research Institute, Chemical Engineering & Applied Chemistry, Aston University, Aston Triangle, Birmingham, B4 7ET, UK

    M. J. Taylor & G. Kyriakou

  3. Chemistry Department, Cambridge University, Cambridge, UK

    R. M. Lambert

  4. Instituto de Ciencia de Materiales de Sevilla (CSIC), Americo Vespucio 49, 41092, Seville, Spain

    R. M. Lambert

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  1. I. V. Yentekakis
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  2. G. Goula
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  3. S. Kampouri
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  4. I. Betsi-Argyropoulou
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  5. P. Panagiotopoulou
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  6. M. J. Taylor
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  7. G. Kyriakou
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  8. R. M. Lambert
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Correspondence to I. V. Yentekakis.

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Yentekakis, I.V., Goula, G., Kampouri, S. et al. Ir-Catalysed Nitrous oxide (N2O) Decomposition: Effect of Ir Particle Size and Metal–Support Interactions. Catal Lett 148, 341–347 (2018). https://doi.org/10.1007/s10562-017-2233-z

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  • DOI: https://doi.org/10.1007/s10562-017-2233-z

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