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

Publication: Research - peer-reviewJournal article – Annual report year: 2014

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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
StatePublished - 2014
CitationsWeb of Science® Times Cited: 3

    Keywords

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