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PXCT of activated catalyst Ni/Al2O3‐ha (a) and artificially coked catalyst Ni/Al2O3‐hc (b). Each reconstructed volume (gray) is shown with a cut through the middle, illustrating the segmented and labeled tomograms (gray=nanoporous catalyst body, orange=pores, green=contamination) and a grayscale Ne image of a typical slice through the volume (color bar in Ne / e− Å−3, Ne offset to 0 with respect to air close to the sample, see Supporting Information).
