4.7 Article Proceedings Paper

Nanoparticle sintering in atomic layer deposition of supported catalysts: Kinetic modeling of the size distribution

期刊

CATALYSIS TODAY
卷 316, 期 -, 页码 51-61

出版社

ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2018.02.020

关键词

Dynamic coalescence; Ostwald ripening; Nanoparticle growth; Size distribution; Modeling; Mechanisms

资金

  1. European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013)/ERC Grant [279632]
  2. European Research Council (ERC) [279632] Funding Source: European Research Council (ERC)

向作者/读者索取更多资源

In industrial catalysis, the sintering of supported nanoparticles (NPs) is often associated with the loss of catalyst activity and thus with periodic plant downtime and economic burdens. Yet, sintering mechanisms are at play also during the synthesis of the catalyst itself. They can, in fact, determine the size distribution of the NPs, and thus the activity and the stability of the catalyst. Here, we examine the role of nanoparticle sintering in a technique borrowed from the semiconductor industry that promises to reconcile atomic-scale precision with scalability: atomic layer deposition. By modeling the cyclic influx of single atoms in concomitance with NP sintering via either dynamic coalescence or Ostwald ripening, we establish the signature of different growth regimes: the size distribution. In contrast, we show that integral quantities such as the mean diameter, the number of NPs per unit area, and the material loading are poor indicators of the underlying growth mechanism. In particular, a constant number of NPs cannot be interpreted as a sign of no sintering. Finally, we argue that NP sintering, if properly understood, can open up new avenues for the control over the size distribution of NPs, and thus over their catalytic activity and stability.

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