Details
| Original language | English |
|---|---|
| Pages (from-to) | 12694-12703 |
| Number of pages | 10 |
| Journal | Journal of Physical Chemistry C |
| Volume | 122 |
| Issue number | 24 |
| Early online date | 9 Mar 2018 |
| Publication status | Published - 21 Jun 2018 |
Abstract
Chemical wave patterns and the formation of macroscopic vanadium oxide islands have been investigated in the 10-4 mbar range during catalytic methanol oxidation on ultrathin VOx films (θV ≤ 1 monolayer equivalent) supported on Rh(110). At temperatures around 800 K, wave fragments traveling along the [110] direction and oxidation/reduction fronts exhibiting different front geometries are observed with photoemission electron microscopy. At ≈1000 K, a redistribution of VOx leads to the growth of macroscopic oxide islands under reaction conditions. On these macroscopic V-oxide islands chemical waves including traveling wave fragments propagate. Under conditions close to equistability of oxidized and reduced phase, a dendritic growth of the V-oxide islands is observed. In contrast to Rh(111)/VOx, almost no catalytic activity in formaldehyde production is found on Rh(110)/VOx.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- General Energy
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
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In: Journal of Physical Chemistry C, Vol. 122, No. 24, 21.06.2018, p. 12694-12703.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Chemical Wave Patterns and Oxide Redistribution during Methanol Oxidation on a V-Oxide Promoted Rh(110) Surface
AU - Von Boehn, Bernhard
AU - Imbihl, Ronald
N1 - Publisher Copyright: © 2018 American Chemical Society. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018/6/21
Y1 - 2018/6/21
N2 - Chemical wave patterns and the formation of macroscopic vanadium oxide islands have been investigated in the 10-4 mbar range during catalytic methanol oxidation on ultrathin VOx films (θV ≤ 1 monolayer equivalent) supported on Rh(110). At temperatures around 800 K, wave fragments traveling along the [110] direction and oxidation/reduction fronts exhibiting different front geometries are observed with photoemission electron microscopy. At ≈1000 K, a redistribution of VOx leads to the growth of macroscopic oxide islands under reaction conditions. On these macroscopic V-oxide islands chemical waves including traveling wave fragments propagate. Under conditions close to equistability of oxidized and reduced phase, a dendritic growth of the V-oxide islands is observed. In contrast to Rh(111)/VOx, almost no catalytic activity in formaldehyde production is found on Rh(110)/VOx.
AB - Chemical wave patterns and the formation of macroscopic vanadium oxide islands have been investigated in the 10-4 mbar range during catalytic methanol oxidation on ultrathin VOx films (θV ≤ 1 monolayer equivalent) supported on Rh(110). At temperatures around 800 K, wave fragments traveling along the [110] direction and oxidation/reduction fronts exhibiting different front geometries are observed with photoemission electron microscopy. At ≈1000 K, a redistribution of VOx leads to the growth of macroscopic oxide islands under reaction conditions. On these macroscopic V-oxide islands chemical waves including traveling wave fragments propagate. Under conditions close to equistability of oxidized and reduced phase, a dendritic growth of the V-oxide islands is observed. In contrast to Rh(111)/VOx, almost no catalytic activity in formaldehyde production is found on Rh(110)/VOx.
UR - http://www.scopus.com/inward/record.url?scp=85047574294&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.8b00852
DO - 10.1021/acs.jpcc.8b00852
M3 - Article
AN - SCOPUS:85047574294
VL - 122
SP - 12694
EP - 12703
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 24
ER -