Fig. 2: Synthesis and characterization of Pt@Ge-MFI and Pt@Ge-MFI-c catalysts. | Nature Communications

Fig. 2: Synthesis and characterization of Pt@Ge-MFI and Pt@Ge-MFI-c catalysts.

From: Data-driven discovery of Pt single atom embedded germanosilicate MFI zeolite catalysts for propane dehydrogenation

Fig. 2

a Scheme to show the synthesis procedures of Pt@Ge-MFI and Pt@Ge-MFI-c. b XRD patterns of Pt@Ge-MFI(r) (as-synthesized raw sample), Pt@Ge-MFI (as-synthesized catalyst after H2 reduction) and Pt@Ge-MFI-c (as-synthesized catalyst subject to air calcination and H2 reduction). The standard pattern of Mutinaite (PDF#44-0002) is shown for comparison. c–f TEM images of Pt@Ge-MFI (c, d) and Pt@Ge-MFI-c (e, f). g The Pt 4f XPS spectra of Pt@Ge-MFI and Pt@Ge-MFI-c, along with the corresponding EDS images where O, Si, Ge, and Pt are highlighted in pink, green, blue, and red, respectively. The XPS binding energy was calibrated using C 1s at 284.8 eV. In the EDS mapping, large Pt clusters adhering to the zeolite surface are highlighted by circles. h Pt L3-edge normalized XANES spectra of Pt@Ge-MFI, Pt@Ge-MFI-c, Pt foil and PtO2 obtained from synchrotron experiments. i Pt L3-edge radial distance χ(R) space spectra of Pt@Ge-MFI, Pt@Ge-MFI-c, Pt foil and PtO2. More details of χ(k) space spectra fitting curves are shown in Fig. S6 and Table S3. All labels denoted as “a.u.” in Fig. 2 reprensent “arbitrary units”.

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