Effect of particle morphology on the ripening of supported Pt nanoparticles
Artikel i vetenskaplig tidskrift, 2012

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.

Ostwald ripening

AFM

catalyst

sintering

STEM

Pt/Al2O3

TEM

Författare

S. B. Simonsen

Haldor Topsoe A/S

Danmarks Tekniske Universitet

Ib Chorkendorff

Danmarks Tekniske Universitet

Søren Dahl

Danmarks Tekniske Universitet

Magnus Skoglundh

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Kristoffer Meinander

Aarhus Universitet

Thomas Nørregaard Jensen

Aarhus Universitet

Jeppe Lauritsen

Aarhus Universitet

Stig Helveg

Haldor Topsoe A/S

Journal of Physical Chemistry C

1932-7447 (ISSN) 1932-7455 (eISSN)

Vol. 116 5646-5653

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Transport

Energi

Materialvetenskap

Ämneskategorier

Kemiteknik

DOI

10.1021/jp2098262