DRIFTS study of CO adsorption on praseodymium modified Pt/Al2O3

The effect of PrO2 content (1–20 wt.%) and temperature pretreatment on the structure and surface properties of PrO2–Al2O3-supported Pt catalysts was studied by XRD, XPS and DRIFTS of carbon monoxide adsorption. XRD analysis showed that platinum particle size decreases with the increase of PrO2 content for samples calcined at high temperature of 1023 K. The intensity and position of the infrared bands were strongly dependent on the praseodymium oxide content and reduction temperature. Two kinds of Pt sites (Pt0 and Ptδ+) were recorded in reduced PrO2-containing samples. A better thermal stability of the Ptsingle bondCO bond in PrO2-containing samples compared to Pt/Al2O3 was observed.