Details
| Original language | English |
|---|---|
| Pages (from-to) | 1545-1556 |
| Number of pages | 12 |
| Journal | Topics in catalysis |
| Volume | 63 |
| Issue number | 15-18 |
| Early online date | 31 Jul 2020 |
| Publication status | Published - Nov 2020 |
Abstract
The growth of ultrathin layers of VOx (< 12 monolayers) on Pt(111) and the activity of these layers in catalytic methanol oxidation at 10−4 mbar have been studied with low-energy electron diffraction, Auger electron spectroscopy, rate measurements, and with photoemission electron microscopy. Reactive deposition of V in O2 at 670 K obeys a Stranski–Krastanov growth mode with a (√3 × √3)R30° structure representing the limiting case for epitaxial growth of 3D-VOx. The activity of VOx/Pt(111) in catalytic methanol oxidation is very low and no redistribution dynamics is observed lifting the initial spatial homogeneity of the VOx layer. Under reaction conditions, part of the surface vanadium diffuses into the Pt subsurface region. Exposure to O2 causes part of the V to diffuse back to the surface, but only up to one monolayer of VOx can be stabilized in this way at 10−4 mbar.
Keywords
- Methanol oxidation, Pt(111), Stranski–Krastanow growth, Supported catalyst, vanadium oxide catalysts
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
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In: Topics in catalysis, Vol. 63, No. 15-18, 11.2020, p. 1545-1556.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Reactivity and Stability of Ultrathin VOx Films on Pt(111) in Catalytic Methanol Oxidation
AU - von Boehn, Bernhard
AU - Scholtz, Lena
AU - Imbihl, Ronald
N1 - Funding Information: Open Access funding provided by Projekt DEAL. Bernhard von Boehn would like to thank the Department of Inorganic Chemistry of the Fritz Haber Institute of the Max Planck Society for financial support.
PY - 2020/11
Y1 - 2020/11
N2 - The growth of ultrathin layers of VOx (< 12 monolayers) on Pt(111) and the activity of these layers in catalytic methanol oxidation at 10−4 mbar have been studied with low-energy electron diffraction, Auger electron spectroscopy, rate measurements, and with photoemission electron microscopy. Reactive deposition of V in O2 at 670 K obeys a Stranski–Krastanov growth mode with a (√3 × √3)R30° structure representing the limiting case for epitaxial growth of 3D-VOx. The activity of VOx/Pt(111) in catalytic methanol oxidation is very low and no redistribution dynamics is observed lifting the initial spatial homogeneity of the VOx layer. Under reaction conditions, part of the surface vanadium diffuses into the Pt subsurface region. Exposure to O2 causes part of the V to diffuse back to the surface, but only up to one monolayer of VOx can be stabilized in this way at 10−4 mbar.
AB - The growth of ultrathin layers of VOx (< 12 monolayers) on Pt(111) and the activity of these layers in catalytic methanol oxidation at 10−4 mbar have been studied with low-energy electron diffraction, Auger electron spectroscopy, rate measurements, and with photoemission electron microscopy. Reactive deposition of V in O2 at 670 K obeys a Stranski–Krastanov growth mode with a (√3 × √3)R30° structure representing the limiting case for epitaxial growth of 3D-VOx. The activity of VOx/Pt(111) in catalytic methanol oxidation is very low and no redistribution dynamics is observed lifting the initial spatial homogeneity of the VOx layer. Under reaction conditions, part of the surface vanadium diffuses into the Pt subsurface region. Exposure to O2 causes part of the V to diffuse back to the surface, but only up to one monolayer of VOx can be stabilized in this way at 10−4 mbar.
KW - Methanol oxidation
KW - Pt(111)
KW - Stranski–Krastanow growth
KW - Supported catalyst
KW - vanadium oxide catalysts
UR - http://www.scopus.com/inward/record.url?scp=85088875477&partnerID=8YFLogxK
U2 - 10.1007/s11244-020-01321-z
DO - 10.1007/s11244-020-01321-z
M3 - Article
AN - SCOPUS:85088875477
VL - 63
SP - 1545
EP - 1556
JO - Topics in catalysis
JF - Topics in catalysis
SN - 1022-5528
IS - 15-18
ER -