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.

sintering

STEM

AFM

TEM

Pt/Al2O3

catalyst

Ostwald ripening

Författare

S. B. Simonsen

Haldor Topsoe

Danmarks Tekniske Universitet (DTU)

Ib Chorkendorff

Danmarks Tekniske Universitet (DTU)

Søren Dahl

Danmarks Tekniske Universitet (DTU)

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

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