Figure 2. CO-DRIFTS spectra at saturation CO coverage followed by He purging of (A) Pd/CeO2-H200, (B) Pd/CeO2-H300, (C) Pd/CeO2-H600 and (D) Pd/CeO2-H600-O500 samples. CO-DRIFTS: Diffuse reflectance infrared Fourier transform spectroscopy of CO adsorption.