期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 116, 期 9, 页码 5646-5653出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp2098262
关键词
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资金
- MC2-Access project
- Danish National Research Foundation
- European Research Council (ERC) [239834]
- European Research Council (ERC) [239834] Funding Source: European Research Council (ERC)
To improve the understanding of sintering in diesel and lean-burn engine exhaust after-treatment catalysts, we examined oxygen-induced sintering in a model catalyst consisting of Pt nanoparticles supported on a planar, amorphous Al2O3 substrate. After aging at increasing temperatures, a transmission electron microscopy analysis reveals that a highly monodispersed ensemble of nanoparticles transformed into an ensemble with bimodal and subsequently Lifshitz-Slyozov-Wagner particle size distribution. Moreover, scanning transmission electron microscopy and atomic force microscopy analyses suggest that the Pt nanoparticle had size-dependent morphologies after sintering in the 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 shape.
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