【摘要】 以球形-γAl2O3和-θAl2O3为载体,分别采用超声浸渍和普通浸渍方法制备了Pd含量为0.3%的负载型催化剂,并将其用于蒽醌加氢反应.采用X射线衍射、N2吸附和透射电镜等手段对催化剂的理化性质和孔结构进行了分析,考察了浸渍方法对催化剂活性金属分散度的影响.结果表明,与普通浸渍法相比,超声浸渍法制备的负载型Pd催化剂金属分散度明显提高,因而对蒽醌加氢反应表现出较高的催化活性.以960℃焙烧的球形-θAl2O3为载体,通过超声浸渍制备的负载型Pd催化剂具有较高的Pd分散度和较大的孔径,在蒽醌加氢反应中对反应物的扩散阻力较小,因而表现出更高的催化活性,而且反应中催化剂的稳定性良好.更多还原

【Abstract】 Palladium catalysts supported on spherical（γ-Al₂O₃） and（θ-Al₂O₃） with palladium loading of 0.3% were prepared with and without ultrasonic treatment during the impregnation step.Structural and physical properties of the catalysts were characterized by X-ray diffraction,N₂ adsorption,and transmission electron microscopy.The effects of ultrasonic treatment on the Pd distribution and anthraquinone hydrogenation activity of the（catalysts） were investigated.The results show that the activity of the supported catalysts prepared with ultrasonic treatment for anthraquinone hydrogenation is higher than those without ultrasonic treatment.Compared（with the Pd/γ-Al₂O₃） catalyst,the supported catalyst Pd/（θ-Al₂O₃） prepared under the same condition of ultrasonic treatment during the impregnation step has higher catalytic activity and stability in anthraquinone（hydrogenation.）更多还原