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Catalysis pp 51-158 | Cite as

The Electron Microscopy of Catalysts

  • J. V. Sanders
Part of the Catalysis book series (CATALYSIS, volume 7)

Abstract

Many practical catalysts have a complex geometric structure with a range of hierarchies of porosity to enable reacting gases or fluids to reach as much of the surface of the catalyst as possible, and of course for the products to diffuse out and away from the catalyst. The catalysing surface frequently consists of a complex chemical mixture of different phases produced by an empirically evolved chemical process which may incorporate activators, promoters, and so on. The active component is frequently in the form of very small crystals dispersed on the large surface area of a spongy supporting component of the catalyst. The behaviour and misbehaviour of this type of catalyst can depend upon the structure and composition of the active component as well as the morphology of its supporting medium. In order to understand the catalyst’s behaviour it may be necessary to examine its structure at a range of magnifications from a few hundreds to a few millions of times. This will allow us to determine the form and distribution of the active components, the nature of the porosity, the distribution and nature of a coke or poisoning deposit, and so on. This can be achieved by the use of electron microscopy in a variety of forms. Research chemists and industrial chemists have only recently started to use these techniques. In the past they have probably been inhibited from making full use of them because of a lack of experience or appreciation of the various different ways in which an electron microscope can be used.

Keywords

Scan Transmission Electron Microscope Lattice Image Metallic Particle Diffract Beam Objective Aperture 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag, Berlin, Heidelberg 1985

Authors and Affiliations

  • J. V. Sanders
    • 1
  1. 1.Division of Materials ScienceC.S.I.R.O.ParkvilleAustralia

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