Fig. 4: In situ characterizations.
From: Memory-dictated dynamics of single-atom Pt on CeO2 for CO oxidation
In situ CO-DRIFTS for a Pt/CeO2 and b PtATCeO2 in CO and O2 mixture as varying the temperature from 35 to 180 °C, as well as c the CO-DRIFTS after reaction at 250 °C, and cooling down to 35 °C in CO + O2 or O2. Pt L3-edge in situ XANES of d Pt/CeO2, and e PtATCeO2 at 25 °C in ambient air and different reaction temperatures (25, 70, 100, 150, 180 °C) in CO oxidation condition (CO/O2 ratio is 1:4). the corresponding magnitude of the Fourier transform of the EXAFS of f Pt/CeO2 and g PtATCeO2 at 25 °C in ambient air, and at 25 °C, 180 °C under reaction condition, k = 3–12.5 Å−1 for the Fourier transform. Quasi in situ Pt 4f XPS spectra for h Pt/CeO2 and i PtATCeO2 without or with treatment at different reaction temperatures (CO/O2 ratio is 1:4) for 20 min. After treatment, gases were pumped for the XPS test.
