Details
| Original language | English |
|---|---|
| Pages (from-to) | 99-109 |
| Number of pages | 11 |
| Journal | Journal of catalysis |
| Volume | 296 |
| Early online date | 18 Oct 2012 |
| Publication status | Published - Jun 2013 |
Abstract
The electrochemical promotion of the C2H4 + O 2 reaction over a bimetallic Pt/Ag catalyst (Pt:Ag ratio ≈ 1.5) interfaced to yttrium stabilized zirconia (YSZ) has been studied at 0.25 mbar and T = 650 K using X-ray photoelectron spectroscopy as in situ method. Applying a positive potential of 2 V causes a relative rate increase in the CO 2 production up to 120%; the electrocatalytic promotion effect is non-Faradaic (Λ ≈ 2). An electrochemical promotion is found to occur only at high enough p(C2H4) when a carbonaceous CH x layers builds up inhibiting O2 adsorption. The CH x film is estimated to be about 5-6 layers thick. Only at low p(C2H4), the application of an electric potential causes a decrease in the carbon signal associated with a growth of the O1s signal at 529.3 eV. The latter species can be assigned to an electrochemically generated oxygen spillover species at Ag sites.
Keywords
- Electrochemical promotion, Ethylene oxidation, Oxygen spillover, Pt/Ag catalyst, X-ray photoelectron spectroscopy (XPS), Yttrium stabilized zirconia (YSZ)
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Journal of catalysis, Vol. 296, 06.2013, p. 99-109.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Ambient pressure X-ray photoelectron spectroscopy during electrochemical promotion of ethylene oxidation over a bimetallic Pt-Ag/YSZ catalyst
AU - Toghan, Arafat
AU - Arrigo, Rosa
AU - Knop-Gericke, Axel
AU - Imbihl, Ronald
N1 - Funding Information: The authors gratefully acknowledge the BESSY staff for their continuous support during the experiments. A.T is indebted to the Egyptian Ministry of Higher Education and the South Valley University, Egypt, for providing him with a doctoral scholarship. The authors thank the Deutsche Forschungsgemeinschaft (DFG) for the financial support.
PY - 2013/6
Y1 - 2013/6
N2 - The electrochemical promotion of the C2H4 + O 2 reaction over a bimetallic Pt/Ag catalyst (Pt:Ag ratio ≈ 1.5) interfaced to yttrium stabilized zirconia (YSZ) has been studied at 0.25 mbar and T = 650 K using X-ray photoelectron spectroscopy as in situ method. Applying a positive potential of 2 V causes a relative rate increase in the CO 2 production up to 120%; the electrocatalytic promotion effect is non-Faradaic (Λ ≈ 2). An electrochemical promotion is found to occur only at high enough p(C2H4) when a carbonaceous CH x layers builds up inhibiting O2 adsorption. The CH x film is estimated to be about 5-6 layers thick. Only at low p(C2H4), the application of an electric potential causes a decrease in the carbon signal associated with a growth of the O1s signal at 529.3 eV. The latter species can be assigned to an electrochemically generated oxygen spillover species at Ag sites.
AB - The electrochemical promotion of the C2H4 + O 2 reaction over a bimetallic Pt/Ag catalyst (Pt:Ag ratio ≈ 1.5) interfaced to yttrium stabilized zirconia (YSZ) has been studied at 0.25 mbar and T = 650 K using X-ray photoelectron spectroscopy as in situ method. Applying a positive potential of 2 V causes a relative rate increase in the CO 2 production up to 120%; the electrocatalytic promotion effect is non-Faradaic (Λ ≈ 2). An electrochemical promotion is found to occur only at high enough p(C2H4) when a carbonaceous CH x layers builds up inhibiting O2 adsorption. The CH x film is estimated to be about 5-6 layers thick. Only at low p(C2H4), the application of an electric potential causes a decrease in the carbon signal associated with a growth of the O1s signal at 529.3 eV. The latter species can be assigned to an electrochemically generated oxygen spillover species at Ag sites.
KW - Electrochemical promotion
KW - Ethylene oxidation
KW - Oxygen spillover
KW - Pt/Ag catalyst
KW - X-ray photoelectron spectroscopy (XPS)
KW - Yttrium stabilized zirconia (YSZ)
UR - http://www.scopus.com/inward/record.url?scp=84868703229&partnerID=8YFLogxK
U2 - 10.1016/j.jcat.2012.09.006
DO - 10.1016/j.jcat.2012.09.006
M3 - Article
AN - SCOPUS:84868703229
VL - 296
SP - 99
EP - 109
JO - Journal of catalysis
JF - Journal of catalysis
SN - 0021-9517
ER -