Oxidation of CO by NO on planar and faceted Ir(210)

Chen, Wenhua; Bartynski, Robert A.; Kaghazchi, Payam; Jacob, Timo

doi:10.1063/1.4723811

Title: Oxidation of CO by NO on planar and faceted Ir(210)

Journal Article · Mon Jun 11 00:00:00 EDT 2012 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4723811· OSTI ID:1349426

Chen, Wenhua ^[1]; Bartynski, Robert A. ^[1]; Kaghazchi, Payam ^[2]; Jacob, Timo ^[3]

Rutgers, The State Univ. of New Jersey, Piscataway, NJ (United States)
Univ. Ulm, Ulm (Germany)
Univ. Ulm, Ulm (Germany); Helmholtz-Institute Ulm, Ulm (Germany)

Oxidation of CO by pre-adsorbed NO has been studied on planar Ir(210) and nanofaceted Ir(210) with average facet sizes of 5 nm and 14 nm by temperature programmed desorption (TPD). Both surfaces favor oxidation of CO to CO₂, which is accompanied by simultaneous reduction of NO with high selectivity to N₂. At low NO pre-coverage, the temperature (T_i) for the onset of CO₂ desorption as well as CO₂ desorption peak temperature (T_p) decreases with increasing CO exposure, and NO dissociation is affected by co-adsorbed CO. At high NO pre-coverage, T_i and T_p are independent of CO exposure, and co-adsorbed CO has no influence on dissociation of NO. Moreover, at low NO pre-coverage, planar Ir(210) is more active than faceted Ir(210) for oxidation of CO to CO₂: T_i and T_p are much lower on planar Ir(210) than that on faceted Ir(210). In addition, faceted Ir(210) with an average facet size of 5 nm is more active for oxidation of CO to CO₂ than faceted Ir(210) with an average facet size of 14 nm, i.e., oxidation of CO by pre-adsorbed NO on faceted Ir(210) exhibits size effects on the nanometer scale. In comparison, at low O pre-coverage planar Ir(210) is more active than faceted Ir(210) for oxidation of CO to CO₂ but no evidence has been found for size effects in oxidation of CO by pre-adsorbed oxygen on faceted Ir(210) for average facet sizes of 5 nm and 14 nm. The TPD data indicate the same reaction pathway for CO₂ formation from CO + NO and CO + O reactions on planar Ir(210). Lastly, the adsorption sites of CO, NO, O, CO + O, and CO + NO on Ir are characterized by density functional theory.

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Research Organization:: Rutgers Univ., Piscataway, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-93ER14331

OSTI ID:: 1349426

Journal Information:: Journal of Chemical Physics, Vol. 136, Issue 22; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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