Fig. 33. (a) SE SEM image of an FCC catalyst particle. (b) BSE SEM image; (c) confocal fluorescence microscopy image (λ _ex = 561 nm, detection 570–620 nm, false color image) and (d) overlay of the BSE SEM image with the confocal fluorescence microscopy image for the particle depicted in (a) after milling away a 7 μm thick slice using the FIB. (e) Three-dimensional reconstruction of the porous network in a volume of 24.6 × 12.1 × 2.0 μm of an FCC particle, constructed from the combination of a number of FIB-SEM images. Macropores are shown in blue, the external surface is shown in yellow. Reproduced from ref. 181.