催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (4): 312-316.

• 研究论文 • 上一篇    下一篇

Pd-Ce-B/水滑石催化液相苯酚选择性加氢制环己酮

刘建良,李辉,李和兴   

  1. 上海师范大学化学系, 上海 200234
  • 收稿日期:2007-04-25 出版日期:2007-04-25 发布日期:2011-03-28

Liquid-Phase Selective Hydrogenation of Phenol to Cyclohexanone over Pd-Ce-B/Hydrotalcite Catalyst

LIU Jianliang, LI Hui, LI Hexing*   

  1. Department of Chemistry, Shanghai Normal University, Shanghai 200234, China
  • Received:2007-04-25 Online:2007-04-25 Published:2011-03-28

PDF

1017

被引次数

48

摘要： 以Al3+/(Al3++Mg2+)摩尔比为0.2的水滑石(HT)为载体,采用还原浸渍法制备了负载型Pd-Ce-B/HT催化剂,并将其应用于液相苯酚选择性加氢制环己酮. 与Pd-Ce-B/Al2O3, Pd-Ce-B/MgO和Pd-Ce-B/SiO2相比, Pd-Ce-B/HT催化剂具有高活性和高环己酮选择性. 5.8%Pd-Ce-B/HT上苯酚的转化率和环己酮的选择性分别达82.0%和80.3%, 显示了其潜在的工业化应用前景. 根据多种表征结果,初步讨论了催化剂的构效关系以及添加剂Ce3+和载体酸碱性对催化性能的促进作用.

关键词: 钯, 铈, 硼, 水滑石, 负载型催化剂, 苯酚, 加氢, 环己酮

Abstract: Supported Pd-Ce-B catalysts were prepared by chemical reduction of Pd and Ce ions deposited on hydrotalcite (HT) with an Al3+/(Al3++Mg2+) molar ratio of 0.2. In the reaction of liquid-phase selective hydrogenation of phenol, the as-prepared Pd-Ce-B/HT catalyst exhibited much higher activity and selectivity for cyclohexanone than Pd-Ce-B/Al2O3, Pd-Ce-B/MgO, and Pd-Ce-B/SiO2. The maximum phenol conversion and selectivity for cyclohexanone over 5.8%Pd-Ce-B/HT reached 82.0% and 80.3%, respectively. Based on the results of various characterizations, the catalyst structure-activity correlation and the promoting effects of the Ce dopant and acidic-basic properties of the support on the catalyst behavior were discussed.

Key words: palladium, cerium, boron, hydrotalcite, supported catalyst, phenol, hydrogenation, cyclohexanone