Issue 35, 2013
From the journal:

Physical Chemistry Chemical Physics

Reversible structural transformation of FeOxnanostructures on Pt under cycling redox conditions and its effect on oxidation catalysis†

Qiang Fu,*a   Yunxi Yao,a   Xiaoguang Guo,a   Mingming Wei,a   Yanxiao Ning,a   Hongyang Liu,ab   Fan Yang,a   Zhi Liuc  and  Xinhe Bao*a  

* Corresponding authors

a State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, P.R. China
E-mail: qfu@dicp.ac.cn, xhbao@dicp.ac.cn

b Shenyang National Laboratory of Materials Science, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, P.R. China

c Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA

Abstract

Understanding dynamic changes of catalytically active nanostructures under reaction conditions is a pivotal challenge in catalysis research, which has been extensively addressed in metal nanoparticles but is less explored in supported oxide nanocatalysts. Here, structural changes of iron oxide (FeOx) nanostructures supported on Pt in a gaseous environment were examined by scanning tunneling microscopy, ambient pressure X-ray photoelectron spectroscopy, and in situ X-ray absorption spectroscopy using both model systems and real catalysts. O–Fe (FeO) bilayer nanostructures can be stabilized on Pt surfaces in reductive environments such as vacuum conditions and H2-rich reaction gas, which are highly active for low temperature CO oxidation. In contrast, exposure to H2-free oxidative gases produces a less active O–Fe–O (FeO2) trilayer structure. Reversible transformation between the FeO bilayer and FeO2 trilayer structures can be achieved under alternating reduction and oxidation conditions, leading to oscillation in the catalytic oxidation performance.

Graphical abstract: Reversible structural transformation of FeOx nanostructures on Pt under cycling redox conditions and its effect on oxidation catalysis

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Supplementary files

Article information

DOI
https://doi.org/10.1039/C3CP52587B
Article type
Paper
Submitted
10 May 2013
Accepted
05 Jul 2013
First published
08 Jul 2013

Phys. Chem. Chem. Phys., 2013,15, 14708-14714

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Reversible structural transformation of FeOx nanostructures on Pt under cycling redox conditions and its effect on oxidation catalysis

Q. Fu, Y. Yao, X. Guo, M. Wei, Y. Ning, H. Liu, F. Yang, Z. Liu and X. Bao, Phys. Chem. Chem. Phys., 2013, 15, 14708 DOI: 10.1039/C3CP52587B

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