An amorphous approach to the structure of a Pt–Fe/γ-Al2O3catalyst characterized by XAFS

文献信息

发布日期 2001-03-29
DOI 10.1039/B100690H
影响因子 3.676
作者

Li-wu Lin, Yuan Kou, Ming Zou, Zhen Yan


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摘要

A Pt–Fe/γ-Al2O3 catalyst has been investigated by means of Pt LIII-and Fe K-edge X-ray absorption fine structure (XAFS). X-Ray absorption near-edge structure (XANES) clearly indicates the formation of highly dispersed zerovalent Pt atoms on the surface after reduction. The iron precursor Fe2O3 is reduced to well-dispersed FeO. Six Pt neighbors at 2.72, 3.14 and 3.83 Å, respectively, are found for each Pt atom on Pt/γ-Al2O3. However, only one type of Pt neighbor, at 2.75 Å with a low coordination number of 0.8, is detected for the Pt sites on Pt–Fe/Al2O3. An amorphous approach to rationalizing a possible structure of Pt–Fe/Al2O3 has been discussed at the atomic level by consideration of the surface coordinate geometry. The XAFS-derived parameters are highly commensurate with a sandwich model. An iron oxide phase with the stoichiometry Fe17O19 is present as an interface between Pt and γ-Al2O3 while zerovalent Pt atoms are randomly distributed on the iron oxide surface as a mixture of monomers, dimers and trimers, well separated from each other.

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来源期刊

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
自引率: 10.3%
年发文量: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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