Effect of TiO₂ on Al₂O₃ supported Pd catalyst prepared by co-precipitation

A series of 1% Pd/Al₂O₃-TiO₂ catalysts were prepared by co-precipitation method. XRD and XPS were used for the catalysts characterization. The characterization results showed that the structure of Al₂O₃-TiO₂ was amorphous. TiO₂ reduced the combination energy between Pd and Al₂O₃. Samples were used for selective catalytic reduction of NO with C₃H₆, and the conversion of NO was taken as the factor for characterizing the catalytic activity. It is found that the content of TiO₂ has a prominent effect on the catalytic activity. As the content of TiO₂ is less than 50%, the catalytic activity is enhanced quickly. The growth of the catalytic activity takes on gradual tendency when the contents of TiO₂ are beyond 50 percent.