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In situ DRIFTS spectra recorded in the IR region 2200–2000 cm–1 over CeO2, Zn–Ce–O, and Cu–Ce–O solids after the following gas treatment: CO/O2/Ar at 250 °C/30 min, cool down to 25 °C in CO/O2 followed by Ar purge (1 min), and spectrum acquisition. Feed gas composition: CO = 4 vol %, O2 = 20 vol %, balance Ar; FT = 50 N mL min–1.
