Evidence for direct observation by Mössbauer spectroscopy of surface tin atoms in platinum-tin particles

J. P. Candy; E. Roisin; J. M. Basset; D. Uzio; S. Morin; L. Fischer; J. Olivier-Fourcade; J. C. Jumas

doi:10.1007/s10751-006-9247-z

Evidence for direct observation by Mössbauer spectroscopy of surface tin atoms in platinum-tin particles

J. P. Candy^*, E. Roisin, J. M. Basset, D. Uzio, S. Morin, L. Fischer, J. Olivier-Fourcade, J. C. Jumas

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

¹¹⁹Sn Mössbauer spectroscopy at 77 K was used to observe surface tin atoms on PtSn_x/SiO₂ catalysts. Two families of PtSn_x/SiO₂ catalysts with fully reduced Pt⁽⁰⁾ and Sn⁽⁰⁾ atoms were prepared following the Surface Organo-metallic Chemistry on Metal strategy. These two families of catalysts exhibit about the same Sn/Pt composition, but very different metallic particle diameters, each with narrow particle size distribution, so that, the ratio between surface tin atoms and "bulk" tin atoms was significantly different for the two families. In addition to the well known "Pt-Sn" bulk alloy with small quadripole splitting, a new Pt-Sn species with large quadripole splitting and isomer shift in the range of Sn⁽⁰⁾ was observed. The relative proportion of this species with respect to "Pt-Sn" bulk alloy is greater for small particles than for the larger ones, which suggests that this species is a surface tin atom present in a "Pt-Sn" alloy.

Original language	English (US)
Pages (from-to)	55-60
Number of pages	6
Journal	Hyperfine Interactions
Volume	165
Issue number	1-4
DOIs	https://doi.org/10.1007/s10751-006-9247-z
State	Published - Sep 2005
Externally published	Yes

Keywords

Mössbauer spectroscopy
Platinum-tin catalysts
Surface organo-metallic chemistry on metal route

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Nuclear and High Energy Physics
Condensed Matter Physics
Physical and Theoretical Chemistry

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10.1007/s10751-006-9247-z

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title = "Evidence for direct observation by M{\"o}ssbauer spectroscopy of surface tin atoms in platinum-tin particles",

abstract = "119Sn M{\"o}ssbauer spectroscopy at 77 K was used to observe surface tin atoms on PtSnx/SiO2 catalysts. Two families of PtSnx/SiO2 catalysts with fully reduced Pt(0) and Sn(0) atoms were prepared following the Surface Organo-metallic Chemistry on Metal strategy. These two families of catalysts exhibit about the same Sn/Pt composition, but very different metallic particle diameters, each with narrow particle size distribution, so that, the ratio between surface tin atoms and {"}bulk{"} tin atoms was significantly different for the two families. In addition to the well known {"}Pt-Sn{"} bulk alloy with small quadripole splitting, a new Pt-Sn species with large quadripole splitting and isomer shift in the range of Sn(0) was observed. The relative proportion of this species with respect to {"}Pt-Sn{"} bulk alloy is greater for small particles than for the larger ones, which suggests that this species is a surface tin atom present in a {"}Pt-Sn{"} alloy.",

keywords = "M{\"o}ssbauer spectroscopy, Platinum-tin catalysts, Surface organo-metallic chemistry on metal route",

author = "Candy, {J. P.} and E. Roisin and Basset, {J. M.} and D. Uzio and S. Morin and L. Fischer and J. Olivier-Fourcade and Jumas, {J. C.}",

year = "2005",

month = sep,

doi = "10.1007/s10751-006-9247-z",

language = "English (US)",

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AU - Candy, J. P.

AU - Roisin, E.

AU - Basset, J. M.

AU - Uzio, D.

AU - Morin, S.

AU - Fischer, L.

AU - Olivier-Fourcade, J.

AU - Jumas, J. C.

PY - 2005/9

Y1 - 2005/9

N2 - 119Sn Mössbauer spectroscopy at 77 K was used to observe surface tin atoms on PtSnx/SiO2 catalysts. Two families of PtSnx/SiO2 catalysts with fully reduced Pt(0) and Sn(0) atoms were prepared following the Surface Organo-metallic Chemistry on Metal strategy. These two families of catalysts exhibit about the same Sn/Pt composition, but very different metallic particle diameters, each with narrow particle size distribution, so that, the ratio between surface tin atoms and "bulk" tin atoms was significantly different for the two families. In addition to the well known "Pt-Sn" bulk alloy with small quadripole splitting, a new Pt-Sn species with large quadripole splitting and isomer shift in the range of Sn(0) was observed. The relative proportion of this species with respect to "Pt-Sn" bulk alloy is greater for small particles than for the larger ones, which suggests that this species is a surface tin atom present in a "Pt-Sn" alloy.

AB - 119Sn Mössbauer spectroscopy at 77 K was used to observe surface tin atoms on PtSnx/SiO2 catalysts. Two families of PtSnx/SiO2 catalysts with fully reduced Pt(0) and Sn(0) atoms were prepared following the Surface Organo-metallic Chemistry on Metal strategy. These two families of catalysts exhibit about the same Sn/Pt composition, but very different metallic particle diameters, each with narrow particle size distribution, so that, the ratio between surface tin atoms and "bulk" tin atoms was significantly different for the two families. In addition to the well known "Pt-Sn" bulk alloy with small quadripole splitting, a new Pt-Sn species with large quadripole splitting and isomer shift in the range of Sn(0) was observed. The relative proportion of this species with respect to "Pt-Sn" bulk alloy is greater for small particles than for the larger ones, which suggests that this species is a surface tin atom present in a "Pt-Sn" alloy.

KW - Mössbauer spectroscopy

KW - Platinum-tin catalysts

KW - Surface organo-metallic chemistry on metal route

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DO - 10.1007/s10751-006-9247-z

M3 - Article

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EP - 60

JO - Hyperfine Interactions

JF - Hyperfine Interactions

IS - 1-4

ER -

Evidence for direct observation by Mössbauer spectroscopy of surface tin atoms in platinum-tin particles

Abstract

Keywords

ASJC Scopus subject areas

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