Preparation of TiO2-supported Au nanoparticle catalysts from a Au13 cluster precursor : Ligand removal using ozone exposure versus a rapid thermal treatment
The structure of Au heterogeneous catalysts on the anatase form of TiO2 has been characterized by high-resolution electron microscopy (HREM) and quantitative Z-contrast scanning transmission electron microscopy (STEM). These materials are prepared by deposition of highly monodisperse Au13[PPh3]4[S(C...
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Veröffentlicht in: | Journal of catalysis 2006-10, Vol.243 (1), p.64-73 |
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description | The structure of Au heterogeneous catalysts on the anatase form of TiO2 has been characterized by high-resolution electron microscopy (HREM) and quantitative Z-contrast scanning transmission electron microscopy (STEM). These materials are prepared by deposition of highly monodisperse Au13[PPh3]4[S(CH2)11CH3]4 (8-(symbol) diameter) ligand-protected clusters on anatase, followed by reaction with ozone or a rapid oxidative thermal treatment to remove the ligands. The materials obtained differ markedly in each case. For the thermal treatment at 400 degrees C in air, the supported particles grow to an average size of 2.7 nm (+/- 0.6 nm) in diameter, and the larger particles in the distribution are found to adopt a spherical geometry. Particle growth is greatly inhibited when ozone is used to remove the ligands (average diameter 1.2 +/- 0.5 nm). These particles assume a more oblate geometry, consistent with a truncated hemispherical shape. It was found that subsequent thermal treatments of the ozone-derived supported nanoparticles at 400 degrees C in air did not induce additional growth, indicating that sintering is strongly affected by the particle-support interactions developed by the ozone-based low-temperature ligand removal step. These materials exhibit catalytic activity and high stability for the oxidation of CO at elevated temperatures, with the level of activity dependent on catalyst preparation. [PUBLICATION ABSTRACT] |
doi_str_mv | 10.1016/j.jcat.2006.07.006 |
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These materials are prepared by deposition of highly monodisperse Au13[PPh3]4[S(CH2)11CH3]4 (8-(symbol) diameter) ligand-protected clusters on anatase, followed by reaction with ozone or a rapid oxidative thermal treatment to remove the ligands. The materials obtained differ markedly in each case. For the thermal treatment at 400 degrees C in air, the supported particles grow to an average size of 2.7 nm (+/- 0.6 nm) in diameter, and the larger particles in the distribution are found to adopt a spherical geometry. Particle growth is greatly inhibited when ozone is used to remove the ligands (average diameter 1.2 +/- 0.5 nm). These particles assume a more oblate geometry, consistent with a truncated hemispherical shape. It was found that subsequent thermal treatments of the ozone-derived supported nanoparticles at 400 degrees C in air did not induce additional growth, indicating that sintering is strongly affected by the particle-support interactions developed by the ozone-based low-temperature ligand removal step. These materials exhibit catalytic activity and high stability for the oxidation of CO at elevated temperatures, with the level of activity dependent on catalyst preparation. [PUBLICATION ABSTRACT]</description><identifier>ISSN: 0021-9517</identifier><identifier>EISSN: 1090-2694</identifier><identifier>DOI: 10.1016/j.jcat.2006.07.006</identifier><identifier>CODEN: JCTLA5</identifier><language>eng</language><publisher>Amsterdam: Elsevier</publisher><subject>Catalysis ; Catalysts ; Chemistry ; Colloidal state and disperse state ; Exact sciences and technology ; General and physical chemistry ; Gold ; Nanoparticles ; Physical and chemical studies. Granulometry. Electrokinetic phenomena ; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry ; Titanium ; Transmission electron microscopy</subject><ispartof>Journal of catalysis, 2006-10, Vol.243 (1), p.64-73</ispartof><rights>2006 INIST-CNRS</rights><rights>Copyright © 2006 Elsevier B.V. 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These materials are prepared by deposition of highly monodisperse Au13[PPh3]4[S(CH2)11CH3]4 (8-(symbol) diameter) ligand-protected clusters on anatase, followed by reaction with ozone or a rapid oxidative thermal treatment to remove the ligands. The materials obtained differ markedly in each case. For the thermal treatment at 400 degrees C in air, the supported particles grow to an average size of 2.7 nm (+/- 0.6 nm) in diameter, and the larger particles in the distribution are found to adopt a spherical geometry. Particle growth is greatly inhibited when ozone is used to remove the ligands (average diameter 1.2 +/- 0.5 nm). These particles assume a more oblate geometry, consistent with a truncated hemispherical shape. It was found that subsequent thermal treatments of the ozone-derived supported nanoparticles at 400 degrees C in air did not induce additional growth, indicating that sintering is strongly affected by the particle-support interactions developed by the ozone-based low-temperature ligand removal step. These materials exhibit catalytic activity and high stability for the oxidation of CO at elevated temperatures, with the level of activity dependent on catalyst preparation. [PUBLICATION ABSTRACT]</description><subject>Catalysis</subject><subject>Catalysts</subject><subject>Chemistry</subject><subject>Colloidal state and disperse state</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Gold</subject><subject>Nanoparticles</subject><subject>Physical and chemical studies. Granulometry. Electrokinetic phenomena</subject><subject>Theory of reactions, general kinetics. Catalysis. 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Granulometry. Electrokinetic phenomena</topic><topic>Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</topic><topic>Titanium</topic><topic>Transmission electron microscopy</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>MENARD, Laurent D</creatorcontrib><creatorcontrib>FENGTING XU</creatorcontrib><creatorcontrib>NUZZO, Ralph G</creatorcontrib><creatorcontrib>YANG, Judith C</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><jtitle>Journal of catalysis</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>MENARD, Laurent D</au><au>FENGTING XU</au><au>NUZZO, Ralph G</au><au>YANG, Judith C</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Preparation of TiO2-supported Au nanoparticle catalysts from a Au13 cluster precursor : Ligand removal using ozone exposure versus a rapid thermal treatment</atitle><jtitle>Journal of catalysis</jtitle><date>2006-10-01</date><risdate>2006</risdate><volume>243</volume><issue>1</issue><spage>64</spage><epage>73</epage><pages>64-73</pages><issn>0021-9517</issn><eissn>1090-2694</eissn><coden>JCTLA5</coden><abstract>The structure of Au heterogeneous catalysts on the anatase form of TiO2 has been characterized by high-resolution electron microscopy (HREM) and quantitative Z-contrast scanning transmission electron microscopy (STEM). These materials are prepared by deposition of highly monodisperse Au13[PPh3]4[S(CH2)11CH3]4 (8-(symbol) diameter) ligand-protected clusters on anatase, followed by reaction with ozone or a rapid oxidative thermal treatment to remove the ligands. The materials obtained differ markedly in each case. For the thermal treatment at 400 degrees C in air, the supported particles grow to an average size of 2.7 nm (+/- 0.6 nm) in diameter, and the larger particles in the distribution are found to adopt a spherical geometry. Particle growth is greatly inhibited when ozone is used to remove the ligands (average diameter 1.2 +/- 0.5 nm). These particles assume a more oblate geometry, consistent with a truncated hemispherical shape. It was found that subsequent thermal treatments of the ozone-derived supported nanoparticles at 400 degrees C in air did not induce additional growth, indicating that sintering is strongly affected by the particle-support interactions developed by the ozone-based low-temperature ligand removal step. These materials exhibit catalytic activity and high stability for the oxidation of CO at elevated temperatures, with the level of activity dependent on catalyst preparation. [PUBLICATION ABSTRACT]</abstract><cop>Amsterdam</cop><pub>Elsevier</pub><doi>10.1016/j.jcat.2006.07.006</doi><tpages>10</tpages></addata></record> |
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subjects | Catalysis Catalysts Chemistry Colloidal state and disperse state Exact sciences and technology General and physical chemistry Gold Nanoparticles Physical and chemical studies. Granulometry. Electrokinetic phenomena Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry Titanium Transmission electron microscopy |
title | Preparation of TiO2-supported Au nanoparticle catalysts from a Au13 cluster precursor : Ligand removal using ozone exposure versus a rapid thermal treatment |
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