Operando XANES Reveals the Chemical State of Iron-Oxide Monolayers During Low-Temperature CO Oxidation
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| Názov: | Operando XANES Reveals the Chemical State of Iron-Oxide Monolayers During Low-Temperature CO Oxidation |
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| Autori: | Gajdek, Dorotea, Wallander, Harald J., Abbondanza, Giuseppe, Harlow, Gary S., Gustafson, Johan, Blomberg, Sara, Carlsson, Per Anders, Just, Justus, Lundgren, Edvin, Merte, Lindsay R. |
| Prispievatelia: | Lund University, Profile areas and other strong research environments, Strategic research areas (SRA), NanoLund: Centre for Nanoscience, Lunds universitet, Profilområden och andra starka forskningsmiljöer, Strategiska forskningsområden (SFO), NanoLund: Centre for Nanoscience, Originator, Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: Nanoscience and Semiconductor Technology, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Nanovetenskap och halvledarteknologi, Originator, Lund University, Faculty of Science, Department of Physics, Synchrotron Radiation Research, Lunds universitet, Naturvetenskapliga fakulteten, Fysiska institutionen, Synkrotronljusfysik, Originator, Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: Photon Science and Technology, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Avancerade ljuskällor, Originator, Lund University, Profile areas and other strong research environments, Lund University Profile areas, LU Profile Area: Light and Materials, Lunds universitet, Profilområden och andra starka forskningsmiljöer, Lunds universitets profilområden, LU profilområde: Ljus och material, Originator, Lund University, Faculty of Engineering, LTH, Departments at LTH, Department of Process and Life Science Engineering, Division of Chemical Engineering, Lunds universitet, Lunds Tekniska Högskola, Institutioner vid LTH, Institutionen för processteknik och tillämpad biovetenskap, Avdelningen för kemiteknik, Originator, Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: Food and Bio, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Livsmedel och bioteknik, Originator, Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: The Energy Transition, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Energiomställningen, Originator, Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: Aerosols, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Aerosoler, Originator, Lund University, MAX IV Laboratory, Lunds universitet, MAX IV-laboratoriet, Originator |
| Zdroj: | ChemPhysChem. 26(2) |
| Predmety: | Natural Sciences, Physical Sciences, Condensed Matter Physics (including Material Physics, Nano Physics), Naturvetenskap, Fysik, Den kondenserade materiens fysik (Här ingår: Materialfysik, nanofysik) |
| Popis: | We have used grazing incidence X-ray absorption near edge spectroscopy (XANES) to investigate the behavior of monolayer FeO (Formula presented.) films on Pt(111) under near ambient pressure CO oxidation conditions with a total gas pressure of 1 bar. Spectra indicate reversible changes during oxidation and reduction by O (Formula presented.) and CO at 150 °C, attributed to a transformation between FeO bilayer and FeO (Formula presented.) trilayer phases. The trilayer phase is also reduced upon heating in CO+O (Formula presented.), consistent with a Mars-van-Krevelen type mechanism for CO oxidation. At higher temperatures, the monolayer film dewets the surface, resulting in a loss of the observed reducibility. A similar iron oxide film prepared on Au(111) shows little sign of reduction or oxidation under the same conditions. The results highlight the unique properties of monolayer FeO and the importance of the Pt support in this reaction. The study furthermore demonstrates the power of grazing-incidence XAFS for in situ studies of these model catalysts under realistic conditions. |
| Prístupová URL adresa: | https://doi.org/10.1002/cphc.202400835 |
| Databáza: | SwePub |
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Nájsť tento článok vo Web of Science | Abstrakt: | We have used grazing incidence X-ray absorption near edge spectroscopy (XANES) to investigate the behavior of monolayer FeO (Formula presented.) films on Pt(111) under near ambient pressure CO oxidation conditions with a total gas pressure of 1 bar. Spectra indicate reversible changes during oxidation and reduction by O (Formula presented.) and CO at 150 °C, attributed to a transformation between FeO bilayer and FeO (Formula presented.) trilayer phases. The trilayer phase is also reduced upon heating in CO+O (Formula presented.), consistent with a Mars-van-Krevelen type mechanism for CO oxidation. At higher temperatures, the monolayer film dewets the surface, resulting in a loss of the observed reducibility. A similar iron oxide film prepared on Au(111) shows little sign of reduction or oxidation under the same conditions. The results highlight the unique properties of monolayer FeO and the importance of the Pt support in this reaction. The study furthermore demonstrates the power of grazing-incidence XAFS for in situ studies of these model catalysts under realistic conditions. |
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| ISSN: | 14394235 |
| DOI: | 10.1002/cphc.202400835 |