Tomographic Heating Holder for In Situ TEM: Study of Pt/C and PtPd/Al2O3 Catalysts as a Function of Temperature

Lionel C. Gontard, Rafal E. Dunin-Borkowski, Asunción Fernández, Dogan Ozkaya, Takeshi Kasama

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    Abstract

    A tomographic heating holder for transmission electron microscopy that can be used to study supported catalysts at temperatures of up to ~1,500°C is described. The specimen is placed in direct thermal contact with a tungsten filament that is oriented perpendicular to the axis of the holder without using a support film, allowing tomographic image acquisition at high specimen tilt angles with minimum optical shadowing. We use the holder to illustrate the evolution of the active phases of Pt nanoparticles on carbon black and PtPd nanoparticles on γ-alumina with temperature. Particle size distributions and changes in active surface area are quantified from tilt series of images acquired after subjecting the specimens to increasing temperatures. The porosity of the alumina support and the sintering mechanisms of the catalysts are shown to depend on distance from the heating filament.
    Original languageEnglish
    JournalMicroscopy and Microanalysis
    Volume20
    Issue number03
    Pages (from-to)982-990
    Number of pages9
    ISSN1431-9276
    DOIs
    Publication statusPublished - 2014

    Keywords

    • In situ TEM
    • TEM specimen holder
    • Particle growth
    • Heterogeneous catalysis
    • Platinum
    • Carbon black
    • Platinum-palladium
    • Alumina

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