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

S. B. Simonsen ; I. Chorkendorff ; S. Dahl ; Magnus Skoglundh (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; J. Sehested ; S. Helveg
Journal of Catalysis (0021-9517). Vol. 281 (2011), 1, p. 147-155.
[Artikel, refereegranskad vetenskaplig]

Sintering of Pt nanoparticles dispersed on a planar SiO(2) 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 10 mbar synthetic air at 650 degrees 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.

Nyckelord: Catalyst deactivation, Sintering, Ostwald ripening, Nanoparticles, Pt, In situ TEM, supported metal-catalysts, transmission electron-microscopy, size, distributions, platinum/silica catalysts, 2-dimensional islands, critical radius, thin-films, oxidation, gamma-al2o3, mechanisms, cabe rw, 1988, v114, p354, lean m, 1971, v6, p19, en m, 1978, v55, p348, akrave.bk, 1967, v28, p2401

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Denna post skapades 2011-08-09. Senast ändrad 2012-01-27.
CPL Pubid: 143904


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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Teknisk ytkemi (2005-2014)
Kompetenscentrum katalys (KCK)


Nanovetenskap och nanoteknik
Hållbar utveckling

Chalmers infrastruktur