Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2008, Vol. 29 ›› Issue (12): 1247-1252.

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Synthesis and Characterization of ZSM-5/Silicalite-1 Core-Shell Zeolite with a Fluoride-Containing Hydrothermal System

TONG Weiyi1, KONG Dejin1,2,3*, LIU Zhicheng2, GUO Yanglong1*, FANG Dingye3   

  1. 1 Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, China; 2 Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China; 3 State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2008-12-25 Online:2008-12-25 Published:2012-09-20

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Abstract: By using ZSM-5 as the core material, which was pretreated with 25% citric acid and then calcined, ZSM-5/Silicalite-1 micro-composites with core-shell struc ture was hydrothermally synthesized in a fluoride-containing system. The compac t silicalite-1 shell reaches 97% coverage on the surface of the core ZSM-5 aft er the secondary intergrown. The product has a decreased surface acidity and a p reservation of the original inside channel acidity.

Key words: core-shell, ZSM-5, silicalite-1, intergrowth, secondary growth, fluoride