Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Incorporation of Titanium into H-ZSM-5 Zeolite via Chemical Vapor Deposition: Effect of Steam Treatment

  • Xu, Cheng-Hua (Green Chemistry Catalyst Research Center, Korea Research Institute of Chemical Technology) ;
  • Jin, Tai-Huan (Green Chemistry Catalyst Research Center, Korea Research Institute of Chemical Technology) ;
  • Jhung, Sung-Hwa (Green Chemistry Catalyst Research Center, Korea Research Institute of Chemical Technology) ;
  • Hwang, Jin-Soo (Green Chemistry Catalyst Research Center, Korea Research Institute of Chemical Technology) ;
  • Chang, Jong-San (Green Chemistry Catalyst Research Center, Korea Research Institute of Chemical Technology) ;
  • Qiu, Fa-Li (Chengdu Institute of Organic Chemistry, The Chinese Academy of Sciences(CAS)) ;
  • Park, Sang-Eon (Department of Chemistry, Inha University)
  • Published : 2004.05.20
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Abstract

Ti-ZSM-5 prepared by secondary synthesis, from the reaction of H-ZSM-5 with vapor phase $TiCl_4$, was characterized with several physicochemical techniques including FT-IR and UV/VIS-DRS. It was found that zeolite structure, surface area and pore volume did not change, and the framework aluminum could not be replaced by titanium atom during the secondary synthesis of Ti-ZSM-5. The incorporation of titanium into the framework might be due to reaction of $TiCl_4$with the silanol groups associated with defects or surface sites. The formation of extra-framework titanium could not be avoided, unless the samples were further treated by water vapor at 550 $^{\circ}C$ or higher temperature. High temperature steam treatment of Ti-ZSM-5 prepared by chemical vapor deposition with $TiCl_4$was efficient to prevent the formation of non-framework titanium species. Ti-ZSM-5 zeolites prepared in this work contained only framework titanium species and exhibited improved catalytic property close to TS-1 prepared by hydrothermal synthesis.

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