Abstract
Pt catalysts supported on mixed PrO2–Al2O3 oxides with different PrO2 loading (1–20wt.%) were prepared by wetness impregnation method. The samples were characterized by XRD, XPS, UV–vis DRS, DRIFTS of CO adsorption, TPR and TEM. XRD analysis of the samples at high calcination temperature of 1023K showed that the size of Pt particles decreases with increasing the PrO2 content. TPR results exhibited a promoted synergetic effect between Pt and Pr oxide expressed by decreasing the reduction temperatures of both species. XPS and DRIFTS data demonstrated a charge transfer from Pt to Pr oxide species, creating Pt sites with different electron density. It was shown that the addition of praseodymium oxide to alumina-supported Pt catalyst leads to improvement of the catalytic activity and stability. It was found that 6wt.% is the optimal content of PrO2 to obtain high active Pt catalysts.
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