“…The particles of support or active phases are often polydisperse, with a normal or lognormal distribution law depending on whether they are formed by coalescence or ripening (Granqvist & Buhrman, 1976;Datye et al, 2006). Morphological details of catalysts may be observed at the nanometre scale with transmission electron microscopy (Thomas & Terasaki, 2002) or electron tomography (Friedrich et al, 2009) and at the micrometre scale with scanning electron microscopy (Lomić et al, 2004), coupled or not with a focused ion beam (Witte et al, 2013). However, the extraction of a particle size distribution is tedious, and these techniques are often limited by their lack of representativeness.…”