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Preparation and Characterization of V2O5/a-TiO2(101) Model Catalysts

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DOI

We prepared vanadia-titania model catalysts with V(+5) oxidation state by sublimating V2O5 powder onto clean anatase TiO2(101) [a-TiO2(101)]. The V2O5/a-TiO2(101) model catalysts with V2O5 in the sub-monolayer coverage range were studied with scanning tunneling microscopy, lab-source X-ray photoelectron spectroscopy, and synchrotron-radiation X-ray photoelectron spectroscopy. On freshly prepared V2O5/a-TiO2(101) samples, we find well-dispersed V2O5 clusters as the smallest species, together with larger particles of V2O5 stoichiometry. Upon vacuum-annealing at ∼500 K, small V2O5 clusters agglomerate into larger particles. Upon vacuum-annealing at ∼700 K, vanadia reduces and, eventually, disappears from the surface via V diffusion into the bulk. The V2O5/a-TiO2(101) model catalyst can be hydroxylated by an ice-assisted preparation. We find evidence for OH groups located at the V2O5/a-TiO2(101) interface as well as at the a-TiO2(101) support.

Original languageEnglish
JournalJournal of Physical Chemistry C
Volume124
Issue49
Pages (from-to)26916-26924
Number of pages9
ISSN1932-7447
DOIs
Publication statusPublished - Dec 2020

Bibliographical note

Funding Information:
We acknowledge support from the Innovation Fund Denmark (IFD), file no. 6151-00008B (ProNOx), the Villum Fonden (project no. 16562), and Haldor Topsøe A/S.

Publisher Copyright:
© 2020 American Chemical Society.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

    Research areas

  • ANATASE, CRYSTAL, GAS-PHASE, MONOLAYER CATALYSTS, PHOTOEMISSION, REACTION-MECHANISM, SPECTROSCOPY, SYNCHROTRON, THERMAL REDUCTION, VANADIUM-OXIDE CATALYSTS

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