Effect of particle morphology on the ripening of supported Pt nanoparticles
Journal article, 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

Author

S. B. Simonsen

Haldor Topsoe

Technical University of Denmark (DTU)

Ib Chorkendorff

Technical University of Denmark (DTU)

Søren Dahl

Technical University of Denmark (DTU)

Magnus Skoglundh

Competence Centre for Catalysis (KCK)

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Kristoffer Meinander

Aarhus University

Thomas Nørregaard Jensen

Aarhus University

Jeppe Lauritsen

Aarhus University

Stig Helveg

Haldor Topsoe

Journal of Physical Chemistry C

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

Vol. 116 9 5646-5653

Driving Forces

Sustainable development

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Transport

Energy

Materials Science

Subject Categories

Chemical Engineering

DOI

10.1021/jp2098262

More information

Latest update

3/27/2018