Reduction of NO by CO on unsupported Ir: Bridging the materials Gap

Wenhua Chen, Quantong Shen, Robert A. Bartynski, Payam Kaghazchi, Timo Jacob

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Temperature programmed desorption (TPD) and density functional theory (DFT) are used to investigate adsorption sites and reaction of coadsorbed NO and CO on planar Ir(210) and faceted Ir(210) with tailored sizes of three-sided nanopyramids exposing (311), (311̄) and (110) faces. Both planar and faceted Ir(210) are highly active for reduction of NO by CO with high selectivity to N2, which is accompanied by simultaneous oxidation of CO. Evidence is found for structure sensitivity in adsorption sites and reaction of coadsorbed NO and CO on faceted Ir(210) versus planar Ir(210). Strong interaction between NO and CO at high NO exposure and one-monolayer CO pre-coverage results in "explosive" evolution of N2 and CO2 on planar Ir(210) and size effects in reduction of NO by CO on faceted Ir(210) for average facet size ranging from 5 to 14 nm without change in facet structure.

Original languageEnglish (US)
Pages (from-to)2515-2520
Number of pages6
JournalChemPhysChem
Volume11
Issue number12
DOIs
StatePublished - 2010

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

Keywords

  • Heterogeneous catalysis
  • Iridium
  • Nanostructures
  • Structure-activity relationships
  • Surface chemistry

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