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Ir-Catalysed Nitrous oxide (NO) Decomposition: Effect of Ir Particle Size and Metal–Support Interactions

Catalysis Letters, ISSN: 1572-879X, Vol: 148, Issue: 1, Page: 341-347
2018
  • 33
    Citations
  • 0
    Usage
  • 26
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    33
    • Citation Indexes
      33
  • Captures
    26

Article Description

Abstract: The effect of the morphology of Ir particles supported on γ-AlO, 8 mol%YO-stabilized ZrO (YSZ), 10 mol%GdO-doped CeO (GDC) and 80 wt%AlO–10 wt%CeO–10 wt%ZrO (ACZ) on their stability on oxidative conditions, the associated metal–support interactions and activity for catalytic decomposition of NO 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-AlO and YSZ). Turnover frequency studies using size-controlled Ir particles showed strong structure sensitivity, de-NO catalysis being favoured on large catalyst particles. Although metallic Ir showed some de-NO activity, IrO 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 [O–δ](Ir) on the surface of iridium nanoparticles, via O backspillover from the support, were significant in the case of GDC and ACZ. Graphical Abstract: [Figure not available: see fulltext.].

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