Catalysis Letters

, Volume 145, Issue 3, pp 757–761 | Cite as

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

  • Wenhua Chen
  • Quantong Shen
  • Robert A. Bartynski


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.

Graphical Abstract


Iridium Faceting Ammonia Oxygen Selectivity Surface morphology 



We acknowledge support of this work by the U.S. Department of Energy, Office of Basic Energy Sciences (Grant No. DE-FG02-93ER14331).


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Wenhua Chen
    • 1
  • Quantong Shen
    • 1
  • Robert A. Bartynski
    • 1
  1. 1.Department of Physics and Astronomy, and Laboratory for Surface ModificationRutgers, The State University of New JerseyPiscatawayUSA

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