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Effect of particle morphology on the ripening of supported Pt nanoparticles

Søren Bredmose Simonsen ; Ib Chorkendorff ; Søren Dahl ; Magnus Skoglundh (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Kristoffer Meinander ; Thomas Nørregaard Jensen ; Jeppe Lauritsen ; Stig Helveg
Journal of Physical Chemistry C (1932-7447). Vol. 116 (2012), 9, p. 5646-5653.
[Artikel, refereegranskad vetenskaplig]

To improve the understanding of sintering in diesel and lean-burn engine exhaust aftertreatment catalysts, we examined oxygen-induced sintering in a model catalyst consisting of Pt nanoparticles supported on a planar, amorphous Al2O3 substrate. After ageing at increasing temperatures, transmission electron microscopy analysis reveals that highly monodisperse ensembles of nanoparticles transformed into ensembles with bimodal and subsequently Lifshitz-Slyozov-Wagner particle size distributions. Moreover, scanning transmission electron microscopy and atomic force microscopy analysis suggest that the Pt nanoparticles have size-dependent morphologies after sintering in oxidizing environment. The evolution of the particle sizes is described by a simple kinetic model for ripening and the size-dependent particle morphology is proposed as an explanation for the observed bimodal particle size distribution shapes.

Nyckelord: sintering; Ostwald ripening; Pt/Al2O3; TEM; STEM; AFM; catalyst



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Denna post skapades 2012-02-20. Senast ändrad 2017-09-14.
CPL Pubid: 155228

 

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Institutioner (Chalmers)

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

Ämnesområden

Energi
Materialvetenskap
Nanovetenskap och nanoteknik
Transport
Hållbar utveckling
Kemiteknik

Chalmers infrastruktur