Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2011, Vol. 32 ›› Issue (3): 428-435.DOI: 10.1016/S1872-2067(10)60183-0

• Research papers • Previous Articles     Next Articles

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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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