Figure 19.

In situ IR spectroscopy of adsorbed CO reveals a certain mobility of the Pt_iso sites as a function of the activation conditions. (a) In situ DRIFTS spectra of CO adsorbed at room temperature on a Pt/CeO₂–Al₂O₃ catalyst as-prepared (black), and on the same catalyst aged at 800 °C for 12 h in air (red) or reduced in 10% H₂ at 400 °C for 1 h (blue). Adapted with permission from ref (305). Copyright 2022 Elsevier. (b) In situ DRIFTS spectra of CO adsorbed at room temperature on a 0.05 wt % Pt/TiO₂ catalyst that was reduced (red), and oxidized (black), sequentially. The intensity of the latter spectrum is multiplied by 100 to allow comparison. Adapted with permission from ref (290). Copyright 2017 American Chemical Society.