Effect of ceria–zirconia ratio on the interaction of CO with PdO/Al2O3–(Cex–Zr1−x)O2 catalysts prepared by sol–gel method

The current work is devoted to study of CO interaction with PdO/Al2O3–(Cex–Zr1−x)O2 catalysts. Ceria–zirconia–alumina supports with different Ce/Zr ratio were prepared by sol–gel technique. The FT-IR characterization of CO adsorbed at −120 and 25 °C on oxidized and reduced samples revealed that Ce/Zr ratio modifies the surface properties of support and oxidation state of palladium. The catalyst with Ce/Zr molar ratio 0.5/0.5 was characterized with the highest ability to stabilize palladium in oxide state and the highest activity to oxidize CO. Redox treatment of catalysts improves their catalytic activity.