关键词: 氧化锆, Pd/Al₂O₃催化剂, 蒽醌加氢

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