IndiumV3, Main, Repository, bibRecord, 001D95

Effect of Indium Doping of γ-Alumina on the Stabilization of PtSn Alloyed Clusters Prepared by Surface Organostannic Chemistry

Identifieur interne : 001D95 ( Main/Repository ); précédent : 001D94; suivant : 001D96

Effect of Indium Doping of γ-Alumina on the Stabilization of PtSn Alloyed Clusters Prepared by Surface Organostannic Chemistry

Auteurs : RBID : Pascal:13-0232388

Descripteurs français

Pascal (Inist)
- Indium, Dopage, Alumine, Chimie surface, Catalyseur, Chimisorption, Microscopie électronique balayage transmission, Spectrométrie Mössbauer, Absorption RX, Coprécipitation, Précurseur, Méthode fonctionnelle densité, Etude théorique, Résultat expérimental, Substrat platine, Substrat indium, Al2O3, 7350, 7115M, 7115, Nanoscience.
Wicri :
- concept : Dopage.

English descriptors

KwdEn :
- Alumina, Catalyst, Chemisorption, Coprecipitation, Density functional method, Doping, Experimental result, Indium, Moessbauer spectrometry, Nanoscience, Precursor, Scanning transmission electron microscopy, Surface chemistry, Theoretical study, X ray absorption.

Abstract

The control of the atomic-scale properties of highly dispersed multimetallic particles represents a challenging question for the optimal use of metallic active centers in nanoscience. In particular, improving the formation of Pt_xSn alloyed clusters on γ-alumina of a size close to 1 nm with a high Sn⁰/Pt ratio represents a crucial step toward more selective heterogeneous catalysts. For that purpose, bimetallic SnPt-based and trimetallic SnPtIn-based catalysts were prepared by surface organostannic chemistry on monometallic Pt and bimetallic PtIn-based catalysts. These systems were characterized by a multi-technique approach combining CO chemisorption, temperature programmed reduction, scanning transmission electron microscopy, Mössbauer spectroscopy, and X-ray absorption spectroscopy. The nature of the PtSn phase in trimetallic SnPtIn-based catalysts is found to strongly depend on the way indium is initially introduced in the parent catalyst, by either wet impregnation or coprecipitation with aluminum precursor. The key role of In^3* species on the formation of PtSn alloyed clusters is revealed. By using density functional theory calculations, we give a rational interpretation of the experimental results and provide an atomic scale description of Pt_xSn_y/γ-Al₂O₃ systems, with or without In³⁺ on the alumina surface. The formation of In-Pt, In-Sn, and O-Sn bonds is indeed favored when In³⁺ is present in the support. This work proposes an original approach for stabilizing Pt_xSn alloyed clusters with an elevated Sn⁰/Pt ratio and highly dispersed on γ-alumina using indium as "third element" introduced as In³⁺ on the support.

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Links to Exploration step

Pascal:13-0232388

Le document en format XML

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<author><name sortKey="Jumas, Jean Claude" uniqKey="Jumas J">Jean-Claude Jumas</name>
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<author><name sortKey="Lacombe, Sylvie" uniqKey="Lacombe S">Sylvie Lacombe</name>
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<seriesStmt><idno type="ISSN">1932-7447</idno>
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<title level="j" type="main">Journal of physical chemistry. C</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Alumina</term>
<term>Catalyst</term>
<term>Chemisorption</term>
<term>Coprecipitation</term>
<term>Density functional method</term>
<term>Doping</term>
<term>Experimental result</term>
<term>Indium</term>
<term>Moessbauer spectrometry</term>
<term>Nanoscience</term>
<term>Precursor</term>
<term>Scanning transmission electron microscopy</term>
<term>Surface chemistry</term>
<term>Theoretical study</term>
<term>X ray absorption</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Indium</term>
<term>Dopage</term>
<term>Alumine</term>
<term>Chimie surface</term>
<term>Catalyseur</term>
<term>Chimisorption</term>
<term>Microscopie électronique balayage transmission</term>
<term>Spectrométrie Mössbauer</term>
<term>Absorption RX</term>
<term>Coprécipitation</term>
<term>Précurseur</term>
<term>Méthode fonctionnelle densité</term>
<term>Etude théorique</term>
<term>Résultat expérimental</term>
<term>Substrat platine</term>
<term>Substrat indium</term>
<term>Al2O3</term>
<term>7350</term>
<term>7115M</term>
<term>7115</term>
<term>Nanoscience</term>
</keywords>
<keywords scheme="Wicri" type="concept" xml:lang="fr"><term>Dopage</term>
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<front><div type="abstract" xml:lang="en">The control of the atomic-scale properties of highly dispersed multimetallic particles represents a challenging question for the optimal use of metallic active centers in nanoscience. In particular, improving the formation of Pt<sub>x</sub>
Sn alloyed clusters on γ-alumina of a size close to 1 nm with a high Sn<sup>0</sup>
/Pt ratio represents a crucial step toward more selective heterogeneous catalysts. For that purpose, bimetallic SnPt-based and trimetallic SnPtIn-based catalysts were prepared by surface organostannic chemistry on monometallic Pt and bimetallic PtIn-based catalysts. These systems were characterized by a multi-technique approach combining CO chemisorption, temperature programmed reduction, scanning transmission electron microscopy, Mössbauer spectroscopy, and X-ray absorption spectroscopy. The nature of the PtSn phase in trimetallic SnPtIn-based catalysts is found to strongly depend on the way indium is initially introduced in the parent catalyst, by either wet impregnation or coprecipitation with aluminum precursor. The key role of In<sup>3*</sup>
 species on the formation of PtSn alloyed clusters is revealed. By using density functional theory calculations, we give a rational interpretation of the experimental results and provide an atomic scale description of Pt<sub>x</sub>
Sn<sub>y</sub>
/γ-Al<sub>2</sub>
O<sub>3</sub>
 systems, with or without In<sup>3+</sup>
 on the alumina surface. The formation of In-Pt, In-Sn, and O-Sn bonds is indeed favored when In<sup>3+</sup>
 is present in the support. This work proposes an original approach for stabilizing Pt<sub>x</sub>
Sn alloyed clusters with an elevated Sn<sup>0</sup>
/Pt ratio and highly dispersed on γ-alumina using indium as "third element" introduced as In<sup>3+</sup>
 on the support.</div>
</front>
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<fC01 i1="01" l="ENG"><s0>The control of the atomic-scale properties of highly dispersed multimetallic particles represents a challenging question for the optimal use of metallic active centers in nanoscience. In particular, improving the formation of Pt<sub>x</sub>
Sn alloyed clusters on γ-alumina of a size close to 1 nm with a high Sn<sup>0</sup>
/Pt ratio represents a crucial step toward more selective heterogeneous catalysts. For that purpose, bimetallic SnPt-based and trimetallic SnPtIn-based catalysts were prepared by surface organostannic chemistry on monometallic Pt and bimetallic PtIn-based catalysts. These systems were characterized by a multi-technique approach combining CO chemisorption, temperature programmed reduction, scanning transmission electron microscopy, Mössbauer spectroscopy, and X-ray absorption spectroscopy. The nature of the PtSn phase in trimetallic SnPtIn-based catalysts is found to strongly depend on the way indium is initially introduced in the parent catalyst, by either wet impregnation or coprecipitation with aluminum precursor. The key role of In<sup>3*</sup>
 species on the formation of PtSn alloyed clusters is revealed. By using density functional theory calculations, we give a rational interpretation of the experimental results and provide an atomic scale description of Pt<sub>x</sub>
Sn<sub>y</sub>
/γ-Al<sub>2</sub>
O<sub>3</sub>
 systems, with or without In<sup>3+</sup>
 on the alumina surface. The formation of In-Pt, In-Sn, and O-Sn bonds is indeed favored when In<sup>3+</sup>
 is present in the support. This work proposes an original approach for stabilizing Pt<sub>x</sub>
Sn alloyed clusters with an elevated Sn<sup>0</sup>
/Pt ratio and highly dispersed on γ-alumina using indium as "third element" introduced as In<sup>3+</sup>
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<s2>NK</s2>
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<s5>04</s5>
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<s5>04</s5>
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<s5>05</s5>
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<fC03 i1="05" i2="X" l="ENG"><s0>Catalyst</s0>
<s5>05</s5>
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<fC03 i1="05" i2="X" l="SPA"><s0>Catalizador</s0>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE"><s0>Chimisorption</s0>
<s5>06</s5>
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<fC03 i1="06" i2="X" l="ENG"><s0>Chemisorption</s0>
<s5>06</s5>
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<s5>07</s5>
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<s5>08</s5>
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<fC03 i1="08" i2="X" l="ENG"><s0>Moessbauer spectrometry</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA"><s0>Espectrometría Mössbauer</s0>
<s5>08</s5>
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<s5>09</s5>
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<s5>09</s5>
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<fC03 i1="09" i2="X" l="SPA"><s0>Absorción RX</s0>
<s5>09</s5>
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<s5>10</s5>
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<fC03 i1="10" i2="X" l="ENG"><s0>Coprecipitation</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA"><s0>Coprecipitación</s0>
<s5>10</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE"><s0>Précurseur</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="X" l="ENG"><s0>Precursor</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="X" l="SPA"><s0>Precursor</s0>
<s5>11</s5>
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<fC03 i1="12" i2="3" l="FRE"><s0>Méthode fonctionnelle densité</s0>
<s5>12</s5>
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<fC03 i1="12" i2="3" l="ENG"><s0>Density functional method</s0>
<s5>12</s5>
</fC03>
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<s5>13</s5>
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<fC03 i1="15" i2="X" l="FRE"><s0>Substrat platine</s0>
<s4>INC</s4>
<s5>46</s5>
</fC03>
<fC03 i1="16" i2="X" l="FRE"><s0>Substrat indium</s0>
<s4>INC</s4>
<s5>47</s5>
</fC03>
<fC03 i1="17" i2="X" l="FRE"><s0>Al2O3</s0>
<s4>INC</s4>
<s5>48</s5>
</fC03>
<fC03 i1="18" i2="X" l="FRE"><s0>7350</s0>
<s4>INC</s4>
<s5>71</s5>
</fC03>
<fC03 i1="19" i2="X" l="FRE"><s0>7115M</s0>
<s4>INC</s4>
<s5>72</s5>
</fC03>
<fC03 i1="20" i2="X" l="FRE"><s0>7115</s0>
<s4>INC</s4>
<s5>73</s5>
</fC03>
<fC03 i1="21" i2="X" l="FRE"><s0>Nanoscience</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03>
<fC03 i1="21" i2="X" l="ENG"><s0>Nanoscience</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03>
<fC03 i1="21" i2="X" l="SPA"><s0>Nanociencia</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03>
<fN21><s1>217</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
</fN82>
</pA>
</standard>
</inist>
</record>

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   |wiki=   *** parameter Area/wikiCode missing *** 
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   |texte=   Effect of Indium Doping of γ-Alumina on the Stabilization of PtSn Alloyed Clusters Prepared by Surface Organostannic Chemistry
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Effect of Indium Doping of γ-Alumina on the Stabilization of PtSn Alloyed Clusters Prepared by Surface Organostannic Chemistry

Effect of Indium Doping of γ-Alumina on the Stabilization of PtSn Alloyed Clusters Prepared by Surface Organostannic Chemistry

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