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6.2.6. X-Ray Photoelectron Spectroscopy The XPS measurements were made using a Perkin-Elmer (Model 5300) spectrometer with Mg K¦Á (1253.6 eV) radiation as the excitation source. The spectra were recorded in the fixed analyzer transmission mode with pass energies of 89.45 and 35.75 eV for recording survey and high-resolution spectra, respectively. The XPS analysis was done at room temperature and pressures on the order of 10-7 torr. Charging of the catalyst samples was corrected by setting the binding energy of the C1s peak at 284.6 eV. Samples were degassed in a vacuum oven overnight before XPS measurements лл |
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