Atomic-Scale View of VOX-WOX Coreduction on the α-Al2O3 (0001) Surface

Martin E. McBriarty, Gavin P. Campbell, Tasha L. Drake, Jeffrey W. Elam, Peter C Stair, Donald E. Ellis, Michael J. Bedzyk

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The catalytic activity of oxide-supported vanadium oxide is improved by the presence of tungsten oxide for the selective catalytic reduction of nitric oxides. We propose a mechanism for V-W synergy through studies of the reduction-oxidation behavior of near-monolayer VOX and WOX species grown by atomic layer deposition on the α-Al2O3 (0001) single crystal surface. In situ X-ray standing wave measurements reveal an overlayer of W6+ species that is correlated with the substrate lattice as well as a redox-reversible shift from uncorrelated V5+ to correlated V4+. X-ray photoelectron spectroscopy and electronic structure calculations show a partial reduction of W6+ in the presence of V4+, improving the Brønsted acidity in mixed V-W catalyst systems. This mechanism of V-W synergy suggests that control of W d-states might be used as a design parameter for Brønsted acid sites in multicomponent oxide catalysts.

Original languageEnglish
Pages (from-to)16179-16187
Number of pages9
JournalJournal of Physical Chemistry C
Volume119
Issue number28
DOIs
Publication statusPublished - Jul 16 2015

Fingerprint

Oxides
Single crystal surfaces
catalysts
Vanadium
Catalysts
Selective catalytic reduction
tungsten oxides
oxides
vanadium oxides
Atomic layer deposition
nitric oxide
atomic layer epitaxy
crystal surfaces
standing waves
Acidity
acidity
Electronic structure
catalytic activity
Monolayers
Catalyst activity

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

McBriarty, M. E., Campbell, G. P., Drake, T. L., Elam, J. W., Stair, P. C., Ellis, D. E., & Bedzyk, M. J. (2015). Atomic-Scale View of VOX-WOX Coreduction on the α-Al2O3 (0001) Surface. Journal of Physical Chemistry C, 119(28), 16179-16187. https://doi.org/10.1021/acs.jpcc.5b04802

Atomic-Scale View of VOX-WOX Coreduction on the α-Al2O3 (0001) Surface. / McBriarty, Martin E.; Campbell, Gavin P.; Drake, Tasha L.; Elam, Jeffrey W.; Stair, Peter C; Ellis, Donald E.; Bedzyk, Michael J.

In: Journal of Physical Chemistry C, Vol. 119, No. 28, 16.07.2015, p. 16179-16187.

Research output: Contribution to journalArticle

McBriarty, ME, Campbell, GP, Drake, TL, Elam, JW, Stair, PC, Ellis, DE & Bedzyk, MJ 2015, 'Atomic-Scale View of VOX-WOX Coreduction on the α-Al2O3 (0001) Surface', Journal of Physical Chemistry C, vol. 119, no. 28, pp. 16179-16187. https://doi.org/10.1021/acs.jpcc.5b04802
McBriarty, Martin E. ; Campbell, Gavin P. ; Drake, Tasha L. ; Elam, Jeffrey W. ; Stair, Peter C ; Ellis, Donald E. ; Bedzyk, Michael J. / Atomic-Scale View of VOX-WOX Coreduction on the α-Al2O3 (0001) Surface. In: Journal of Physical Chemistry C. 2015 ; Vol. 119, No. 28. pp. 16179-16187.
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