超声浸渍法制备Pd/Al_2O_3催化剂及其催化硝基苯加氢性能  

Preparation of Supported Pd/ Al_2O_3 Catalysts by Ultrasonic Impregnation and Their Catalytic Performance for Nitrobenzene Hydrogenation

作　　者：曾永康[1] 曾利辉[1] 潘丽娟[1] 杨乔森[1] 文永忠[1] 张之翔[1] 

机构地区：[1]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2008年第A04期674-676,共3页Rare Metal Materials and Engineering

摘　　要：以粉状γ-Al2O3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5%的负载型催化剂,并将其用于硝基苯加氢反应。采用XPS和扫描电镜等手段对催化剂的理化性质进行了分析,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,因而对硝基苯加氢反应表现出较高的催化活性。以KBH4为还原剂,通过超声浸渍制备的负载型Pd催化剂具有较高的钯分散度,在硝基苯加氢反应中表现出更高的催化活性。Palladium catalysts supported on γ-Al2O3 with palladium loading of 5 % were prepared with and without ultrasonic treatment during the impregnation step. Physical properties of the catalysts were characterized by XPS and scanning electron microscopy （SEM）. 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 nitrobenzene hydrogenation is higher than those without ultrasonic treatment. Compared with the Pd/γ-Al2O3 catalyst, the catalyst reduced by KBH4 has higher catalytic activity and stability in nitrobenzene hydrogenation.

关 键 词：超声浸渍 硝基苯 加氢 钯氧化铝 KBH4 

分 类 号：O643.3[理学—物理化学]