Synthesis of a sinter-resistant, mixed-oxide support for Au nanoclusters

Byoung Koun Min, W. T. Wallace, D. W. Goodman

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105 Citations (Scopus)

Abstract

Following the discovery that small gold clusters highly dispersed on metal oxide supports are active catalysts at low temperature for a variety of reactions, a number of studies have been carried out to determine the structure of the clusters and the mechanism leading to their activity. A major deterrent to the use of these catalysts, however, is that under reaction temperatures and pressures, the clusters tend to sinter, or agglomerate, leading to a dramatic decrease in activity. In an attempt to make these highly active Au catalysts more stable, mixed-oxide supports have been developed by substituting Ti atoms for Si in a silica thin film network. Depending on the amount of Ti deposited, the TiO 2-SiO 2 surface consists of substituted Ti atoms and/or TiO x islands. With deposition of Au onto these TiO 2-SiO 2 surfaces (at low and high Ti coverages), the substituted Ti and/or TiO x islands act as Au cluster nucleation sites, leading to a marked increase in the cluster number density compared to the Ti-free SiO 2 surface. Furthermore, upon exposure of Au clusters nucleated on surfaces with TiO x islands to reaction temperatures and pressures, the clusters do not sinter. These results demonstrate that it is possible to produce a supported Au catalyst where metal agglomeration is significantly inhibited, allowing the unique properties of Au nanoclusters to be fully exploited.

Original languageEnglish
Pages (from-to)14609-14615
Number of pages7
JournalJournal of Physical Chemistry B
Volume108
Issue number38
DOIs
Publication statusPublished - 2004 Sep 23
Externally publishedYes

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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