Figure 2: Comparison of XRD-CT and PDF-CT. | Nature Communications

Figure 2: Comparison of XRD-CT and PDF-CT.

From: Pair distribution function computed tomography

Figure 2

Comparison of information from XRD-CT and PDF-CT during calcination and reduction of 3 mm Ø Pd/Al2O3 industrial catalyst. The XRD-CT intensity maps are determined from the profiled intensities of the (002) and (111) reflections of PdO (a–c) and fcc Pd (d–f), respectively. The PDF-CT intensity maps are determined from the profiled intensities of the Pd–Pd scattering pairs at 3.44 and 2.71 Å as representative of PdO (g–i) and fcc Pd (j–l), respectively. The black circle visible in j of the partially calcined sample corresponds to a void in the sample. This is not visible in the calcined and reduced samples as measurements were performed at a different height on the sample; this is explained in Supplementary Fig. S1. PDF-CT identifies both Pd and PdO material unseen in the XRD-CT but visible in the μ-CT. Images derived from XRD and PDF are each presented with a common log colour-scale; scale bars for each set are shown at the bottom of the figure. CT, computed tomography; fcc, face centred cubic; PDF, pair distribution function; XRD, X-ray diffraction.

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