Acta Chimica Sinica ›› 2002, Vol. 60 ›› Issue (3): 446-450. Previous Articles     Next Articles

Original Articles

完善骨架全硅β沸石性质研究

宋茂莹;王喜庆;龙英才   

  1. 复旦大学化学系.上海(200433)
  • 出版日期:2002-03-15 发布日期:2002-03-15

Studies on Properties of Pure-silica β Zeolite

Song Maoying;Wang Xiqing;Long Yingcai   

  1. Department of Chemistry, Fudan University.Shanghai(200433)
  • Online:2002-03-15 Published:2002-03-15

A pure silica BEA type zeolite (Si-β) was hydrothermally synthesized in a system of SiO_2-TEAOH-HF-H_2O without stirring. Tetraethylammonium hydroxide (TEAOH) was used as the structure directing agent and tetraethylorthosilicate (TEOS) with reagent grade was used as the silica source. β zeolite with a low Si/Al ratio (Si/Al = 20) was dealuminated by reaction with nitric acid solution (13 mol/L) at reflux temperature. The calcined Si-β and dealuminated β zeolite were characterized with XRD, FT-IR, ~(29)Si MAS NMR and adsorption isotherms. The comparison of Si-β with a dealuminated zeolite β has proved that the Si-β possesses a perfect [Si-O] framework and porous structure, and exhibits high hydrophobic/organophilic properties.

Key words: SILICON, ZEOLITE, STRUCTURE CHARACTERISTICS, HYDROPHOBILITY, XRD, NMR, IR

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