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Catalysts under Controlled Atmospheres in the Transmission Electron Microscope

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Authors:
  • Hansen, Thomas Willum ;
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    Orcid logo0000-0002-1861-3054
    Center for Electron Nanoscopy, Technical University of Denmark
  • Wagner, Jakob Birkedal
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    Orcid logo0000-0002-2945-0190
    Center for Electron Nanoscopy, Technical University of Denmark
DOI:
10.1021/cs401148d
Abstract:
Over time, there has been an increasing interest in observing catalysts in their operating environment at high spatial resolution and ultimately to determine the structure of a catalytically active surface. One tool with the potential to do exactly this in direct space is the transmission electron microscope, and since its invention by Ernst Ruska, the idea of imaging samples under gaseous atmospheres was envisioned. However, microscopes have traditionally been operated in high vacuum due to sensitive electron sources, sample contamination, and electron scattering off gas molecules resulting in loss of resolution. Using suitably clean gases, modified pumping schemes, and short pathways through dense gas regions, these issues are now circumvented. Here we provide an account of best practice using environmental transmission electron microscopy on catalytic systems illustrated using select examples from the literature showing how in situ electron microscopy can provide new insight into the state of catalysts under reactive environments. © 2014 American Chemical Society.
Type:
Journal article
Language:
English
Published in:
A C S Catalysis, 2014, Vol 4, Issue 6, p. 1673-1685
Keywords:
TEM; In situ; Controlled atmosphere; ETEM; EELS; EDX; Catalysts
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2014
Scientific Level:
Scientific
ID:
266616580

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