Ultraviolet-laser induced desorption of NO from the Cr2O3(0001) surface: Involvement of a precursor state?

Wilde, Markus; Seiferth, Oliver; Al‐Shamery, Katharina; Freund, Hans‐Joachim

doi:10.1063/1.479300

Cited by 31 publications

(25 citation statements)

References 61 publications

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“…The observations described above can be interpreted on the basis of previous work on NO adsorption on different oxide [41][42][43] and metal surfaces (see refs. 43-51 and references therein).…”

Section: No Interaction With the Pristine Al 2 O 3 Model Supportmentioning

confidence: 77%

Interaction of NO with alumina supported palladium model catalysts

Schauermann

Johánek

Laurin

et al. 2003

Phys. Chem. Chem. Phys.

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The interaction of NO with a well-defined supported Pd model catalyst has been investigated, employing a combination of IR reflection absorption spectroscopy (IRAS) and molecular beam methods. The model catalyst is based on an ordered Al 2 O 3 film, grown on NiAl(110) and has been characterized in detail with respect to its geometric and electronic structure previously. In a first step the interaction of NO with the pure Al 2 O 3 model support is studied. It is observed that NO slowly decomposes at low surface temperature (100 K), resulting in the formation of a variety of N x O y surface species. The decomposition process involves strong structural transformations of the Al 2 O 3 film and is initiated at oxide defect sites. The adsorption of NO on the Pd/Al 2 O 3 model system is explored systematically as a function of surface coverage and temperature. For NO adsorption on the Pd particles, characteristic absorption bands are identified by comparison with single crystal data, which are indicative of particle-specific sites such as edges and other defects. At 300 K and above NO dissociation occurs on the Pd particles, whereas the low-temperature decomposition channel on the alumina support is found to be strongly suppressed in the presence of the Pd particles. Finally, co-adsorption of NO with oxygen-and CO-precovered Pd particles is investigated. Preadsorbed oxygen results in the formation of a mixed adsorbate layer with an enhanced NO population of on-top sites on the particles. NO adsorption on a CO layer, on the other hand, gives rise to a compression of the CO layer and an enhanced population of on-top sites by CO.

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Section: No Interaction With the Pristine Al 2 O 3 Model Supportmentioning

confidence: 77%

Interaction of NO with alumina supported palladium model catalysts

Schauermann

Johánek

Laurin

et al. 2003

Phys. Chem. Chem. Phys.

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“…Lastly, the appearance of the peak at 1885 cm −1 occurs at coverages at which the NO TPD spectra begin to exhibit peaks below about 170 K. Wilde et al have reported analogous behavior in the adsorption of NO on a Cr 2 O 3 (0001) surface and show that NO dimers are responsible for the weak RAIRS peak near 1885 cm −1 . 40 To further investigate the N−O stretch bands that arise from the different NO binding states on Fe 3 O 4 (111), we collected RAIR spectra after heating an NO layer to different temperatures. Figure 4b shows RAIR spectra obtained after preparing a saturated NO layer at 87 K and heating the surface to temperatures of 170 and 315 K, where these temperatures are selected to desorb NO from the predominant states revealed by TPD (Figure 3).…”

Section: ■ Resultsmentioning

confidence: 99%

Adsorption of NO on FeO_x Films Grown on Ag(111)

et al. 2016

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We used temperature-programmed desorption (TPD) and reflection absorption infrared spectroscopy (RAIRS) to characterize the adsorption of NO on crystalline iron oxide films grown on Ag(111), including a Fe3O4(111) layer, an FeO(111) monolayer, and an intermediate FeO x multilayer structure. TPD shows that the NO binding energies vary significantly among the Fe cation sites present on these FeO x surfaces, and provides evidence that NO binds more strongly on Fe2+ sites than Fe3+ sites. The NO TPD spectra obtained from the Fe3O4(111) layer exhibit a dominant peak at 380 K, attributed to NO bound on Fe2+ sites, as well as a broad feature centered at ∼250 K that is consistent with NO bound on Fe3+ sites of Fe3O4(111) as well as NO adsorbed on a minority FeO structure. The NO TPD spectra obtained from the monolayer FeO(111) film exhibits a prominent peak at 269 K. After growing FeO x multilayer islands within the FeO(111) monolayer, we observe a new NO TPD feature at ∼200 K as well as diminution of the sharp TPD peak at 269 K. We speculate that these changes occur because the multilayer FeO x islands expose Fe3+ sites that bind NO more weakly than the Fe2+ sites of the FeO monolayer. RAIR spectra obtained from the NO-covered FeO x surfaces exhibit an N–O stretch band that blueshifts over a range from about 1800 to 1840 cm–1 with increasing NO coverage. The measured N–O stretching frequency is only slightly red-shifted from the gas-phase value, and lies in a range that is consistent with atop, linearly bound NO on the Fe surface sites. In contrast to the NO binding energy, we find that the N–O stretch band is relatively insensitive to the NO binding site on the FeO x surfaces. This behavior suggests that π-backbonding occurs to similar extents among the adsorbed NO species, irrespective of the oxidation state and local structural environment of the Fe surface site.

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“…The photodesorption of NO has also been studied [279]. The photodesorption of NO has also been studied [279].…”

Section: Mo Momentioning

confidence: 99%

Ultrathin Oxide Films

Freund

Goodman

2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Introduction Magnesium Oxide Mg O (100)/ Mo (100) Mg O (100)/ Ag (100) Mg O (111)/ Mo (110) Nickel Oxide Ni O (100)/ Ni (100), Mo (100) Ni O (111)/ Ni (111) Alumina Alumina/ Ni Al (110) Alumina/ Ni 3 Al (111) Al 2 O 3 (111)/ Ta (110) Al 2 O 3 (111)/ Mo (110) and Cu / Al 2 O 3 (111)/ Mo (110) Silica Si O 2 / Mo (110) Si O 2 / Mo (211) Cu / Si O 2 / Mo (110) Pd / Si O 2 / Mo (110) Au / Si O 2 / Mo (211) and Au / Ti O 2 / Si O 2 / Mo (211) Titania Ti x O y / Mo (100), Mo (110), Pt (111), Ni (110), W (100) Au / Ti O x / Mo (211) Chromia Cr 2 O 3 (111)/ Cr (11O) Vanadia Vanadium Sesquioxide Iron oxides Fe O / Pt (111), Fe 2 O 3 (0001)/ Pt (111), Fe 3 O 4 (001)/ Pt (111) Pd , Au on Iron Oxides Niobia Molybdenum Oxide Ceria Binary Oxides Ni O / Mg O , Ni O / Ca O , Mg O / Ni O , Ca O / Ni O / Mo (100) Conclusions Acknowledgments

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Ultraviolet-laser induced desorption of NO from the Cr2O3(0001) surface: Involvement of a precursor state?

Cited by 31 publications

References 61 publications

Interaction of NO with alumina supported palladium model catalysts

Interaction of NO with alumina supported palladium model catalysts

Adsorption of NO on FeO_x Films Grown on Ag(111)

Ultrathin Oxide Films

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Ultraviolet-laser induced desorption of NO from the Cr2O3(0001) surface: Involvement of a precursor state?

Cited by 31 publications

References 61 publications

Interaction of NO with alumina supported palladium model catalysts

Interaction of NO with alumina supported palladium model catalysts

Adsorption of NO on FeOx Films Grown on Ag(111)

Ultrathin Oxide Films

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Adsorption of NO on FeO_x Films Grown on Ag(111)