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
Hauptverfasser: MENARD, Laurent D, FENGTING XU, NUZZO, Ralph G, YANG, Judith C
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creator MENARD, Laurent D
FENGTING XU
NUZZO, Ralph G
YANG, Judith C
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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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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