In the present work several techniques for the characterization of real catalysts are reviewed. These include weak multi-beam images, topographic refraction images, dark field and micro-diffraction. With the combined use of these techniques it is possible to obtain the shape, crystal structure and reliable size distribution of metal particles. A method that permits the visualization of particles below to 10 Å, as well as the determination of the line substrate topography for supported catalysts is discussed.
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