Selective Oxidation of Ammonia by Co-adsorbed Oxygen on Iridium Surfaces: Formation of N2O

Wenhua Chen, Quantong Shen, Robert Bartynski

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Temperature programmed desorption is used to investigate ammonia oxidation by pre-adsorbed oxygen on planar Ir(210) and faceted Ir(210) with different facet sizes. Evidence is found for formation of N2O from both surfaces, which is the first observation of N2O production in catalytic ammonia oxidation under UHV conditions (<1 × 10-9 Torr). The selectivity of the reaction to N2, N2O and NO can be tuned by oxygen pre-coverage, surface structure, and facet size. The reaction exhibits strong structure sensitivity on faceted Ir(210) versus planar Ir(210) and moderate size effects on faceted Ir(210) for average facet sizes of 5-14 nm. (Graph Presented).

Original languageEnglish (US)
Pages (from-to)757-761
Number of pages5
JournalCatalysis Letters
Volume145
Issue number3
DOIs
StatePublished - Mar 4 2015

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Keywords

  • Ammonia
  • Faceting
  • Iridium
  • Oxygen
  • Selectivity
  • Surface morphology

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