One-Step Synthesis of a High Performance Pt-Fe3O4 Catalyst: Intermetallic Al13Fe4 as a Platform and Precursor

Kameoka, Satoshi; Wakabayashi, Satoru; Abe, Eiji; Tsai, A.‐P.

doi:10.1007/s10562-016-1757-y

Cited by 10 publications

(7 citation statements)

References 31 publications

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“…A Pt 3d 5/2 peak was clearly generated by PAF (Figure b), providing evidence that the Pt was soluble in the sample. Characteristics noted in a previous report were well-reproduced in this study (Figure S4), which leads to the same conclusion that the doped Pt atoms preferentially substituted at the Fe sites rather than the Al sites in Al 13 Fe 4 . Moreover, the Pt 3d 5/2 peak position of Al 2 Pt is also shifted from that of bulk Pt in Figure b, so the chemical shift of Pt 3d 5/2 in the case of PAF is attributed to electron transfer from Pt to Al atoms.…”

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confidence: 91%

“…Because novel catalytic materials may be obtained, it is worthwhile to study the effects of doping catalytic metals into the Al 13 Fe 4 matrix. Very recently, there was a report of Pt dispersed as single atoms and substituted at Fe sites in a 0.5 atom % Pt-doped Al 13 Fe 4 phase, based on high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) observations . X-ray photoelectron spectroscopy (XPS) analyses have also suggested that the Pt atoms substitute at the Fe sites in Al 13 Fe 4 .…”

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confidence: 99%

“…Very recently, there was a report of Pt dispersed as single atoms and substituted at Fe sites in a 0.5 atom % Pt-doped Al 13 Fe 4 phase, based on high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) observations . X-ray photoelectron spectroscopy (XPS) analyses have also suggested that the Pt atoms substitute at the Fe sites in Al 13 Fe 4 . However, the crystallographic sites of the Pt atoms could not be determined from the HAADF images since inequivalent Fe sites are overlapped in the two-dimensional projection.…”

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Probing Single Pt Atoms in Complex Intermetallic Al₁₃Fe₄

et al. 2018

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The atomic structure of a 0.2 atom % Pt-doped complex metallic alloy, monoclinic AlFe, was investigated using a single crystal prepared by the Czochralski method. High-angle annular dark-field scanning transmission electron microscopy showed that the Pt atoms were dispersed as single atoms and substituted at Fe sites in AlFe. Single-crystal X-ray structural analysis revealed that the Pt atoms preferentially substitute at Fe(1). Unlike those that have been reported, Pt single atoms in the surface layers showed lower activity and selectivity than those of AlPt and bulk Pt for propyne hydrogenation, indicating that the active state of a given single-atom Pt site is strongly dominated by the bonding to surrounding Al atoms.

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Probing Single Pt Atoms in Complex Intermetallic Al₁₃Fe₄

et al. 2018

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“…In the following sub-sections, two families of (complex) intermetallic compounds are discussed, in relation to the hydrogenation of acetylene and butadiene. The case of quasicrystals or approximants used as catalysts after a leaching process [77][78][79][80][81][82] is not developed, since the catalytic material obtained after the chemical treatment generally consists of metallic nanoparticles dispersed on an oxide, thus leading to mechanisms for the reactivity distinct from the ones valid for ideal intermetallic surfaces.…”

Section: Complex Intermetallic Surfaces and Recent Developments In Catalysismentioning

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Ultra-Thin Films on Complex Metallic Alloy Surfaces: A Perspective

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Gaudry

et al. 2020

Recent Advances in Thin Films

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Complex metallic alloys (CMAs) may be defined as those intermetallic compounds having large (>≈nm) unit cell dimensions. This includes quasicrystals as a special case, the unit cell being infinite. The discovery of quasicrystals motivated the study of CMAs, and the surface science community became active in the field once stable samples of sufficient size were produced. While the initial surface science activity centred on clean surface preparation, increasingly the formation of thin films, both metallic and molecular grew in importance. In this chapter we give a brief introduction to this topic, and then focus on several current areas of interest. These include the growth and characterisation of ultrathin metallic films of diverse architectures, the formation through deposition of novel molecular overlayers and thin films, complex intermetallics as surface alloys, and the potential use of intermetallic surfaces for catalytic reactions.

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“…7 Emerging research topics in this field include the use of intermetallic compounds as a platform to develop more efficient reaction environments via a chemical treatment. [8][9][10][11] Two different well-ordered and atomically dispersed metal elements can be transformed into a composite with unconventional active sites via an appropriate chemical treatment.…”

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