Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 1452-1459 |
| Seitenumfang | 8 |
| Fachzeitschrift | CHEMPHYSCHEM |
| Jahrgang | 11 |
| Ausgabenummer | 7 |
| Publikationsstatus | Veröffentlicht - 3 Mai 2010 |
Abstract
The electrochemical promotion of the C2H4+O2 reaction to form CO2 and H2O is studied in the 10-5 and 10-4 mbar range with a Pt catalyst interfaced as working electrode to yttriumstabilized zirconia (YSZ). Photoemission electron microscopy (PEEM) was used as spatially resolving method. Under open-circuit conditions, that is, without an external voltage applied, the CO2 production exhibits a pronounced hysteresis upon cyclic variation of p(C2H4). The hysteresis is attributed to the build-up of a carbonaceous CHx layer inhibiting O2 adsorption and hence poisoning the reaction. It is shown that the application of a positive potential of 1 V triggers a transition from the unreactive branch of the reaction to an active branch. The large non-Faradayicity reported in the literature for this reaction system is explained as an ignition effect caused by the partial removal of the inhibiting carbonaceaous layer.
ASJC Scopus Sachgebiete
- Physik und Astronomie (insg.)
- Atom- und Molekularphysik sowie Optik
- Chemie (insg.)
- Physikalische und Theoretische Chemie
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in: CHEMPHYSCHEM, Jahrgang 11, Nr. 7, 03.05.2010, S. 1452-1459.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - The electrochemical promotion of ethylene oxidation at a pt/YSZ catalyst
AU - Toghan, Arafat
AU - Rösken, Liz M.
AU - Imbihl, Ronald
PY - 2010/5/3
Y1 - 2010/5/3
N2 - The electrochemical promotion of the C2H4+O2 reaction to form CO2 and H2O is studied in the 10-5 and 10-4 mbar range with a Pt catalyst interfaced as working electrode to yttriumstabilized zirconia (YSZ). Photoemission electron microscopy (PEEM) was used as spatially resolving method. Under open-circuit conditions, that is, without an external voltage applied, the CO2 production exhibits a pronounced hysteresis upon cyclic variation of p(C2H4). The hysteresis is attributed to the build-up of a carbonaceous CHx layer inhibiting O2 adsorption and hence poisoning the reaction. It is shown that the application of a positive potential of 1 V triggers a transition from the unreactive branch of the reaction to an active branch. The large non-Faradayicity reported in the literature for this reaction system is explained as an ignition effect caused by the partial removal of the inhibiting carbonaceaous layer.
AB - The electrochemical promotion of the C2H4+O2 reaction to form CO2 and H2O is studied in the 10-5 and 10-4 mbar range with a Pt catalyst interfaced as working electrode to yttriumstabilized zirconia (YSZ). Photoemission electron microscopy (PEEM) was used as spatially resolving method. Under open-circuit conditions, that is, without an external voltage applied, the CO2 production exhibits a pronounced hysteresis upon cyclic variation of p(C2H4). The hysteresis is attributed to the build-up of a carbonaceous CHx layer inhibiting O2 adsorption and hence poisoning the reaction. It is shown that the application of a positive potential of 1 V triggers a transition from the unreactive branch of the reaction to an active branch. The large non-Faradayicity reported in the literature for this reaction system is explained as an ignition effect caused by the partial removal of the inhibiting carbonaceaous layer.
KW - Electrochemical promotion
KW - Ethylene oxidation
KW - Heterogeneous catalysis
KW - Platinum
KW - Yttrium-stabilized zirconia
UR - http://www.scopus.com/inward/record.url?scp=77952124422&partnerID=8YFLogxK
U2 - 10.1002/cphc.200900936
DO - 10.1002/cphc.200900936
M3 - Article
AN - SCOPUS:77952124422
VL - 11
SP - 1452
EP - 1459
JO - CHEMPHYSCHEM
JF - CHEMPHYSCHEM
SN - 1439-4235
IS - 7
ER -