利用SBA-15介孔内纳米碳合成含介孔的ZSM-5分子筛  

Synthesis of ZSM-5 Molecular Sieves Containing Mesopore Using Nanocarbon in SBA-15 Mesopores

作　　者：李工[1] 邓中林[1] 周书喜[1] 佟惠娟[1] 刘天华[1] 

机构地区：[1]江苏工业学院化工系,江苏常州213164

出　　处：《分子催化》2009年第5期404-411,共8页Journal of Molecular Catalysis(China)

基　　金：江苏省自然科学基金项目(BK2007043;BK2005024)

摘　　要：SBA-15介孔分子筛内填充蔗糖并炭化后,分别在碱性和弱酸性条件下,用含铝源及TPABr的溶液浸渍,将SBA-15分子筛孔壁的无定形结构转化成ZSM-5分子筛的晶体结构,除碳后得到含介孔的ZSM-5分子筛.用X射线衍射、N2吸附-脱附、27Al MAS NMR、NH3-TPD、TEM、SEM等对样品进行了表征,考察了晶化时间等参数对样品的影响.结果表明,碱性条件下合成的ZSM-5分子筛晶体中含有少量孔径约3.2～4.2nm的介孔孔道,其酸强度接近与常规ZSM-5分子筛的酸强度;弱酸性条件下合成的ZSM-5分子筛晶体中含有大量孔径约1.4～1.6nm的孔道,其酸强度明显低于常规ZSM-5分子筛的酸强度.The mesopores of SBA-15 molecular sieve were filled by sucrose and the fillings were carbonized. SBA- 15 molecular sieves containing nanocarbon carbon were impregnated by the slution of aluminum source and TPABr under the condition of alkalinity and weak acidity repectively, the framework of SBA-15 molecular sieve was changed into the crystal construction of ZSM-5 molecular sieve and lastly the ZSM-5 molecular sieves containing mesopore were gained after removing the carbon. The samples were characterized by XRD, N2 adsorption-desorption, 27A1 MAS NMR, NH3-TPD, TEM and SEM methods. We researched the effect of synthesis condition on structure of samples, such as crystallizing time and so on. Results showed that ZSM-5 molecular sieve synthesised under the condition of alkalinity contained a small amount mesopores with pore diameter about 3.2nm -4.2nm and its acid strength was slightly lower than that of ZSM-5 molecular, the sample synthesized unde the condition of weak acidity contained more pores with pore diameter about 1.4 - 1.6nm and its acid strength was obvious lower than that of ZSM-5 molecular.

关 键 词：ZSM-5分子筛 纳米碳 介孔 合成 表征 

分 类 号：O643.32[理学—物理化学]