Preparation, characterization, and catalytic properties of tungsten trioxide cyclic trimers on FeO(111)/Pt(111)

Shao Chun Li, Zhenjun Li, Zhenrong Zhang, Bruce D. Kay, Roger Rousseau, Zdenek Dohnálek

Research output: Contribution to journalArticle

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Abstract

The structure and catalytic activity of tungsten oxide clusters formed via sublimation of monodispersed cyclic (WO 3) 3 onto FeO(111)/Pt(111) has been studied by a combination of scanning tunneling microscopy (STM), X-ray photoemission spectroscopy (XPS), infrared reflection-absorption spectroscopy (IRAS), temperature-programmed desorption (TPD), and density functional theory (DFT). After (WO 3) 3 deposition, STM images reveal new features composed of three bright maxima arranged in a equilateral triangular configuration with an edge length of ∼10 Å. This length is significantly larger than the size of (WO 3) 3, indicating that the clusters dissociated. This conclusion is corroborated by DFT calculations showing that cluster dissociation into surface-bound WO 3 monomers is exothermic and kinetically feasible at 300 K. The dissociation is accompanied by significant FeO(111) rearrangements with the Fe ions being pulled on top of the surface and bonded to the WO 3 fragments. Both surface spectroscopies (XPS and IRAS) and calculations indicate that the W ions in the WO 3 monomers remain in their original oxidation state (6+) and possess a single terminal W=O group. TPD studies show that this system does not efficiently catalyze alcohol dehydration. This inactivity is explained on the basis of the reaction mechanism calculated by DFT.

Original languageEnglish
Pages (from-to)908-916
Number of pages9
JournalJournal of Physical Chemistry C
Volume116
Issue number1
DOIs
Publication statusPublished - Jan 12 2012

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trimers
Density functional theory
Tungsten
tungsten
infrared reflection
Scanning tunneling microscopy
Temperature programmed desorption
Photoelectron spectroscopy
density functional theory
X ray spectroscopy
Absorption spectroscopy
preparation
scanning tunneling microscopy
absorption spectroscopy
photoelectric emission
monomers
Monomers
desorption
dissociation
Ions

ASJC Scopus subject areas

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

Cite this

Preparation, characterization, and catalytic properties of tungsten trioxide cyclic trimers on FeO(111)/Pt(111). / Li, Shao Chun; Li, Zhenjun; Zhang, Zhenrong; Kay, Bruce D.; Rousseau, Roger; Dohnálek, Zdenek.

In: Journal of Physical Chemistry C, Vol. 116, No. 1, 12.01.2012, p. 908-916.

Research output: Contribution to journalArticle

Li, Shao Chun ; Li, Zhenjun ; Zhang, Zhenrong ; Kay, Bruce D. ; Rousseau, Roger ; Dohnálek, Zdenek. / Preparation, characterization, and catalytic properties of tungsten trioxide cyclic trimers on FeO(111)/Pt(111). In: Journal of Physical Chemistry C. 2012 ; Vol. 116, No. 1. pp. 908-916.
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