Figure 2. DRIFTS during periodic redox operation at 298 K.

(a) DRIFTS spectra derived from a first CO/O₂ cycle shown in Fig. 1. (b) The 1,200–2,000 cm⁻¹ region of the DRIFTS shown to emphasize the reactive behaviour of species below ca. 1,750 cm⁻¹ as compared with the bridging CO (ca. 1,850 cm⁻¹). (b) Individual absorbance spectra corresponding to the different arrow/lines shown in c. The band positions expected for different aluminum carbonates (red), Pt(CO₃) (blue) and CO (black) are also given²¹,²². (c) Colour map representation of the same set of DRIFTS spectra of a. The red arrow shows the changeover point in time between the CO/Ar flow and the O₂/Ar flow; the solid black line highlights the delay between the switch to O₂, the removal of bridging CO species and the transient re-appearance of the bridging CO band at ca. 1,700 cm⁻¹.