空间限制法制备超细分子筛  

Preparation of super-fine molecular sieve by space-confined method

作　　者：李朝圣[1] 余林[1] 李永峰[1] 孙明[1] 余倩[1] 张雷[1] 

机构地区：[1]广东工业大学轻工化工学院,广东广州510006

出　　处：《无机盐工业》2008年第7期13-15,18,共4页Inorganic Chemicals Industry

基　　金：广东省科技计划项目(2005B10201053);广东省高等学校自然科学研究重点项目(06Z011);广州市科技计划项目(2006J1-C0501);广东省自然科学基金团队项目(04205301)

摘　　要：以甲基纤维素作为空间限制剂,在80℃用空间限制法合成了超细A型分子筛。产物分别用XRD,TEM,BET,TG-DSC,FT-IR等进行了表征。结果表明,空间限制法与常规水热法合成样品的相对结晶度分别为178%与100%,平均粒径分别约为250 nm与600 nm,外比表面积分别为25.0 m2/g与16.90 m2/g,质量损失分别为19.5%与17.0%。与常规水热法合成的样品相比,用甲基纤维素作为空间限制剂合成的A型分子筛样品的结晶度高,晶面间距小,颗粒小而均匀,粒径分布窄,晶体结构规整,微孔结构丰富,相对吸光强度强,且具有相当的热稳定性。The super - fine A - type molecular sieve was prepared by space - confined method using methylcellulose as space confinement additive at 80℃. The products synthesized by space - confined method and conventional hydrothermal process were both characterized by XRD, BET, TG- DSC, FT- IR and TEM respectively. The results showed that the relative crystallinity, average particle size, external surface area and loss weight of samples synthesized by the two methods were 178% and 100% ,about 250 nm and 600 nm,25.0 m^2/g and 16.90 m^2/g,19.5% and 17.0% ,respectively. Compared with the sample by conventional hydrothermal process, A - type molecular sieve synthesized by using methylcellulose as space confinement additive had higher crystallinity, smaller interplanar distance, smaller and more uniform particle, narrow particle size distribution, more regulated crystal structure, richer microporous structure, stronger relative absorbance and the same thermal stability.

关 键 词：分子筛 空间限制法 甲基纤维素 

分 类 号：TQ424.25[化学工程]