催化学报

催化学报 ›› 2006, Vol. 27 ›› Issue (4): 304-308.

• 研究论文 • 上一篇    下一篇

超声浸渍法制备Pd/Al2O3催化剂及其催化蒽醌加氢性能

杨永辉,林彦军,冯俊婷,David G. Evans,李殿卿   

  1. 北京化工大学化工资源有效利用国家重点实验室, 北京100029
  • 收稿日期:2006-04-25 出版日期:2006-04-25 发布日期:1984-12-26

Preparation of Supported Pd/Al2O3 Catalysts by Ultrasonic Impregnation and Their Catalytic Performance for Anthraquinone Hydrogenation

YANG Yonghui, LIN Yanjun, FENG Junting, David G. EVANS, LI Dianqing*   

  1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2006-04-25 Online:2006-04-25 Published:1984-12-26

PDF

1029

被引次数

153

摘要： 以球形 γ-Al2O3 和 θ-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θ-Al2O3 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.

关键词: 超声浸渍, 蒽醌, 氢化, 负载型钯催化剂, 过氧化氢, 球形氧化铝

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.

Key words: ultrasonic impregnation, anthraquinone, hydrogenation, supported palladium catalyst, hydrogen peroxide, spherical alumina