Relating Rates of Catalyst Sintering to the Disappearance of Individual Nanoparticles during Ostwald Ripening

Sivakumar R. Challa, Andrew T. Delariva, Thomas Willum Hansen, Stig Helveg, Jens Sehested, Poul L. Hansen, Fernando Garzon, Abhaya K. Datye

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Sintering of nanoparticles (NPs) of Ni supported on MgAl2O4 was monitored in situ using transmission electron microscopy (TEM) during exposure to an equimolar mixture of H2 and H2O at a pressure of 3.6 mbar at 750 °C, conditions relevant to methane steam reforming. The TEM images revealed an increase in the mean particle size due to disappearance of smaller, immobile NPs and the resultant growth of the larger NPs. A new approach for predicting the long-term sintering of NPs is presented wherein microscopic observations of the ripening of individual NPs (over a span of a few seconds) are used to extract energetic parameters that allow a description of the collective behavior of the entire population of NPs (over several tens of minutes).
    Original languageEnglish
    JournalJournal of the American Chemical Society
    Volume133
    Issue number51
    Pages (from-to)20672-20675
    ISSN0002-7863
    DOIs
    Publication statusPublished - 2011

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