催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (3): 428-435.DOI: 10.1016/S1872-2067(10)60183-0

• 研究论文 • 上一篇    下一篇

纳米磁性颗粒负载的银催化剂催化苯乙烯环氧化反应

潘珍燕 1, 华丽 1, 乔云香 1, 杨汉民 2, 赵秀阁 1, 冯博 1, 朱闻闻 1, 侯震山 1,*   

  1. 1 华东理工大学工业催化研究所, 结构可控先进功能材料及其制备教育部重点实验室, 上海 200237; 2 中南民族大学催化材料科学湖北省重点实验室, 湖北武汉 430074
  • 收稿日期:2010-10-25 修回日期:2010-12-08 出版日期:2011-03-04 发布日期:2014-08-01

Nanostructured Maghemite-Supported Silver Catalysts for Styrene Epoxidation

PAN Zhenyan1, HUA Li1, QIAO Yunxiang1, YANG Hanmin2, ZHAO Xiuge1, FENG Bo1, ZHU Wenwen1, HOU Zhenshan1,*   

  1. 1Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, China; 2Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan 430074, Hubei, China
  • Received:2010-10-25 Revised:2010-12-08 Online:2011-03-04 Published:2014-08-01

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1155

被引次数

28

摘要： 采用简单浸渍和液相还原法制备了 Ag/KOH-γ-Fe2O3 催化剂, 并采用 X 射线衍射、透射电镜和 X 射线光电子能谱等方法对催化剂进行了表征. 结果表明, 在乙酸乙酯介质中, 以叔丁基过氧化氢为氧化剂, 该催化剂具有较高的催化苯乙烯环氧化活性, KOH 的添加可大幅度提高环氧化反应活性和选择性. 表征结果显示, 反应前后催化剂性质没有发生明显的变化. 另外, 所使用的磁性载体有利于负载型银催化剂的分离和循环利用.

关键词: γ-氧化铁, 环氧化, 苯乙烯, 银, 纳米颗粒, 磁分离

Abstract: The supported silver catalyst Ag/KOH-γ-Fe2O3 was prepared by simple impregnation and liquid reduction and then structurally characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. The supported silver catalysts were highly efficient for the epoxidation of styrene using tert-butyl hydroperoxide as the oxidant and ethyl acetate as the reaction medium. The addition of KOH was found to increase the catalytic activity and selectivity significantly. Additionally, the magnetically recoverable γ-Fe2O3, as a support, allowed for an easy separation and recycling of the catalyst after the reaction.

Key words: γ-iron oxide, epoxidation, styrene, silver, nanoparticle, magnetic separation