Ostwald ripening in a Pt/SiO2 model catalyst studied by in situ TEM

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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Sintering of Pt nanoparticles dispersed on a planar SiO2 support was studied by in situ transmission electron microscopy (TEM). A time-lapsed TEM image series of the Pt nanoparticles, acquired during the exposure to 10mbar synthetic air at 650°C, reveal that the sintering was governed by the Ostwald ripening mechanism. The in situ TEM images also provide information about the temporal evolution of the Pt particle size distribution and of the growth or decay of the individual nanoparticles. The observed Pt nanoparticle changes compare well with predictions made by mean-field kinetic models for ripening, but deviations are revealed for the time-evolution for the individual nanoparticles. A better description of the individual nanoparticle ripening is obtained by kinetic models that include local correlations between neighboring nanoparticles in the atom-exchange process.
Original languageEnglish
JournalJournal of Catalysis
Publication date2011
Volume281
Issue1
Pages147-155
ISSN0021-9517
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 37

Keywords

  • Sintering, Pt, Ostwald ripening, Nanoparticles, In situ TEM, Catalyst deactivation
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