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. 2018 Nov 12;9:4751. doi: 10.1038/s41467-018-07046-8

Fig. 4.

Fig. 4

Reduction and activation of the catalyst bed. a Schematic representation illustrating the initial and final probing position during the 3D-XRD-CT at 800 °C under 20% H2/He flow. The gases were introduced into the reactor from the top as indicated by the blue arrows. b The summed diffraction patterns of the 3D-XRD-CT data (30 XRD-CT scans). The black arrow indicates the highest intensity Ni peak. c Phase distribution maps of Ni, NiO, NiAl2O4, CeO2 and ZrO2 corresponding to the normalised scale factors of these phases as derived from the Rietveld analysis of XRD-CT scan 1 as indicated by the black arrow