Details
| Original language | English |
|---|---|
| Pages (from-to) | 171-176 |
| Number of pages | 6 |
| Journal | Catalysis letters |
| Volume | 136 |
| Issue number | 3-4 |
| Publication status | Published - 12 Mar 2010 |
Abstract
The behavior of ultra-thin (<1 ML) films of vanadium oxide on Rh(111) during the H2 + O2 reaction was studied in the 10 -6-10-4 mbar range with photoemission electron microscopy (PEEM). One observes that under reaction conditions the V-oxide condenses forming a stripe pattern of macroscopic dimensions on the surface. The pattern is characterized by an intrinsic wave length which obeys a power law dependence on the reactants pressure. The origin of the pattern is discussed within the concept of reactive phase separation, i.e. the strongly attractive interactions between V and O and/or changes in the interfacial energies caused by reduction are presumably the main driving forces for condensation.
Keywords
- H + O reaction, Photoelectron emission microscopy, Reactive phase separation, Rhodium, Stationary pattern, Vanadium oxide
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
- General Chemistry
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In: Catalysis letters, Vol. 136, No. 3-4, 12.03.2010, p. 171-176.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Redistribution of supported vanadium oxide catalysts by pattern formation
AU - Lovis, Florian
AU - Hesse, Martin
AU - Imbihl, Ronald
PY - 2010/3/12
Y1 - 2010/3/12
N2 - The behavior of ultra-thin (<1 ML) films of vanadium oxide on Rh(111) during the H2 + O2 reaction was studied in the 10 -6-10-4 mbar range with photoemission electron microscopy (PEEM). One observes that under reaction conditions the V-oxide condenses forming a stripe pattern of macroscopic dimensions on the surface. The pattern is characterized by an intrinsic wave length which obeys a power law dependence on the reactants pressure. The origin of the pattern is discussed within the concept of reactive phase separation, i.e. the strongly attractive interactions between V and O and/or changes in the interfacial energies caused by reduction are presumably the main driving forces for condensation.
AB - The behavior of ultra-thin (<1 ML) films of vanadium oxide on Rh(111) during the H2 + O2 reaction was studied in the 10 -6-10-4 mbar range with photoemission electron microscopy (PEEM). One observes that under reaction conditions the V-oxide condenses forming a stripe pattern of macroscopic dimensions on the surface. The pattern is characterized by an intrinsic wave length which obeys a power law dependence on the reactants pressure. The origin of the pattern is discussed within the concept of reactive phase separation, i.e. the strongly attractive interactions between V and O and/or changes in the interfacial energies caused by reduction are presumably the main driving forces for condensation.
KW - H + O reaction
KW - Photoelectron emission microscopy
KW - Reactive phase separation
KW - Rhodium
KW - Stationary pattern
KW - Vanadium oxide
UR - http://www.scopus.com/inward/record.url?scp=77952882764&partnerID=8YFLogxK
U2 - 10.1007/s10562-010-0320-5
DO - 10.1007/s10562-010-0320-5
M3 - Article
AN - SCOPUS:77952882764
VL - 136
SP - 171
EP - 176
JO - Catalysis letters
JF - Catalysis letters
SN - 1011-372X
IS - 3-4
ER -