文中采用共沉淀法制备了混合载体质量分数为1%的Pd/Al₂O₃-TiO₂催化剂，借助XRD和XPS对样品进行了表征，结果表明：混合载体Al₂O₃-TiO₂为无定形结构；TiO₂降低了Pd和Al₂O₃的相互作用能力。将样品应用于C₃H₆选择催化还原NO反应，以NO转化率为活性评价指标对催化剂的活性进行了对比，发现TiO₂的含量对催化剂活性有显著影响：随着TiO₂质量分数从0增加至50%，催化剂活性迅速增加；TiO₂质量分数超过50%，催化剂活性增加趋势变缓。

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.