Abstract: ZrO₂ doped Pd/Al₂O₃ catalyst，in which H₂PdCl₄ and Zr(NO₃)₄ were used as a precursor and an added component respectively，was prepared. Different two step impregnation methods were used for catalyst preparation，and its catalytic activity on anthraquinone hydrogenation was investigated in different reaction conditions. It was found that the catalytic activity was influenced by the preparation methods. When the support with ZrO₂ was calcinated appropriately，the load of Pd was 0.3% and reduction temperature was blow 300 ℃，the catalyst activity is about 20% higher than that of catalyst without ZrO₂. The structure，specific surface area，surface topography and interaction in the components of catalyst were analyzed by X-ray diffraction（XRD），BET surface area，X ray photoelectron spectroscopy（XPS），transmission electron microscopy（TEM），and temperature-programmed reduction（TPR） respectively. The promotion of catalytic properties is attributed to the ZrO₂ which could enhance the heat stability of Al₂O₃，improve the interaction in the components and make Pd diffused on the surface of catalyst.

Key words: ZrO₂, Pd/Al₂O₃ catalyst, anthraquinone hydrogenation

摘要： 以四氯合钯（II）酸（H₂PdCl₄）为前体，活性氧化铝（Al₂O₃）为载体，硝酸锆（Zr(NO₃)₄）为添加组分，采用不同方式的分步浸渍法制备了添加ZrO₂的Pd/Al₂O₃催化剂。考察了制备方法和反应条件对催化剂蒽醌加氢催化性能的影响，发现催化剂活性与制备方法有关。当对添加锆的载体进行适当焙烧，控制Pd负载量为0.3%，还原温度低于300 ℃时，催化剂的蒽醌加氢活性较高，与未添加ZrO₂的催化剂相比提高了约20%。X射线衍射（XRD）、氮气物理吸附（BET）、透射电镜（TEM）、X光电子能谱（XPS）和程序升温还原（TPR）等表征对催化剂物相结构、比表面积、表面形貌及组分间相互作用的分析表明，ZrO₂的掺杂提高了载体Al₂O₃的高温稳定性，改善了催化剂中活性组分Pd与载体间的相互作用，促进了Pd在载体表面的分散，从而提高了催化活性。

关键词: 氧化锆, Pd/Al₂O₃催化剂, 蒽醌加氢