Operando XANES Reveals the Chemical State of Iron-Oxide Monolayers During Low-Temperature CO Oxidation

被引：0

作者：

Gajdek, Dorotea ^{[1
,2
]}

Wallander, Harald J. ^{[1
,2
]}

Abbondanza, Giuseppe ^{[4
]}

Harlow, Gary S. ^{[5
,6
]}

Gustafson, Johan ^{[3
]}

Blomberg, Sara ^{[2
,7
]}

Carlsson, Per-Anders ^{[8
,9
]}

Just, Justus ^{[10
]}

Lundgren, Edvin ^{[2
,3
]}

Merte, Lindsay R. ^{[1
,2
]}

机构：

[1] Malmo Univ, Dept Mat Sci & Appl Math, SE-20506 Malmo, Sweden

[2] Lund Univ, NanoLund, Box 118, SE-22100 Lund, Sweden

[3] Lund Univ, Div Synchrotron Radiat Res, Box 118, S-22100 Lund, Sweden

[4] Chalmers Univ Technol, Dept Chem Phys, SE-41296 Gothenburg, Sweden

[5] Univ Oregon, Dept Chem & Biochem, Eugene, OR 97403 USA

[6] Univ Oregon, Oregon Ctr Electrochem, Eugene, OR 97403 USA

[7] Lund Univ, Dept Proc & Life Sci Engn, Box 118, SE-22100 Lund, Sweden

[8] Chalmers Univ Technol, Dept Chem & Chem Engn, SE-41296 Gothenburg, Sweden

[9] Chalmers Univ Technol, Competence Ctr Catalysis, SE-41296 Gothenburg, Sweden

[10] Lund Univ, MAX Lab 4, Box 118, SE-22100 Lund, Sweden

来源：

CHEMPHYSCHEM | 2025年 / 26卷 / 02期

基金：

瑞典研究理事会;

关键词：

Heterogeneous catalysis; Iron oxide; Operando; Thin films; XAFS; FILM; PT(111); METALS; GROWTH; FEO; NANOPARTICLES; CATALYSIS; SYSTEMS;

D O I：

10.1002/cphc.202400835

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have used grazing incidence X-ray absorption near edge spectroscopy (XANES) to investigate the behavior of monolayer FeO x ${_x }$ 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 2 ${_2 }$ and CO at 150 degrees C, attributed to a transformation between FeO bilayer and FeO 2 ${_2 }$ trilayer phases. The trilayer phase is also reduced upon heating in CO+O 2 ${_2 }$ , 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.

引用

页数：7

共 31 条

[31] The Low-Temperature Magnetic State and Magnetic Ordering Temperature of -Fe<sub>2</sub>O<sub>3</sub> Iron Oxide Nanoparticles
Dubrovskiy, Andrey A.
Semenov, Sergey V.
Knyazev, Yuri V.
Popkov, Sergey I.
Yakushkin, Stas S.
Kirillov, Viktor L.
Martyanov, Oleg N.
Balaev, Dmitry A.
IEEE MAGNETICS LETTERS, 2019, 10

← 1 2 3 4 →