在低表面活性剂浓度下合成含Y沸石次级结构单元的介孔分子筛  

Synthesis of Mesoporous Molecular Sieves with Secondary Building Units of Y Zeolite by Using Surfactants in Low Concentration as Template

作　　者：刘苏[1] 孔令东[2] 何阿弟[1] 李全芝[1] 

机构地区：[1]复旦大学环境科学与工程系,上海200433 [2]复旦大学化学系,上海200433

出　　处：《复旦学报（自然科学版）》2003年第6期1003-1006,共4页Journal of Fudan University：Natural Science

基　　金：国家自然科学基金重点资助项目(29733070);复旦大学研究生创新基金资助项目

摘　　要：以表面Mol比很低(xsurf/xSiO2=0.07)的阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)和阴离子表面活性剂(SL)的混合水溶液为模板,以具有Y沸石次级结构单元的溶胶为前驱体,在碱性条件下合成了孔道结构类似于MCM 41的介孔分子筛.样品的XRD、FT IR、N2吸附 脱附、SEM等表征表明合成的介孔分子筛是孔壁含Y沸石次级结构单元的六角相结构,该介孔分子筛的孔壁厚于常规水热方法得到的MCM 41材料的孔壁,它的形貌有别于常规水热方法得到的MCM 41的疏松形貌,为网状交叉结构.对样品水热稳定性的考察显示,在600℃100%水蒸气下处理10h,仍然可以保持其中孔结构.Mesoporous aluminosilicates with the structure of MCM-41 have been synthesized in alkaline situation, by using the mixture of cationic and anionic surfactants in very low concentration (x_(surf)/x_(SiO_2)=0.07) as template and the gel containing secondary building units of Y zeolite as precursors. XRD, FT-IR and N_2 adsorption and desorption isotherms prove that this material has ordered hexagonal structure with Y zeolite secondary unit in its pore walls, which are thicker than the walls of MCM-41 materials synthesized by normal hydrothermal ways. SEM images shows a very unusual net-like morphology of the material, different from the common loose shape of MCM-41. After being treated in 100% water vapor at 600 ℃ for 10 h, the structure of mesopore can still be sustained, showing high hydrothermal stability.

关 键 词：介孔分子筛 Y沸石 次级结构单元 水热稳定性 合成 表面活性剂 

分 类 号：TQ424.25[化学工程]