具有镶嵌结构T-L多级孔道复合分子筛的快速合成与表征  

Rapid Synthesis and Characterization of Hierarchical Structured T-L Composite Zeolite with the Mosaic Morphology

作　　者：吕爱凝 杨冬花[1] 李建华[1] 马存存 李晓峰[2] 窦涛[2,3] 

机构地区：[1]太原理工大学化学化工学院,山西太原030024 [2]太原理工大学精细化工研究所,山西太原030024 [3]中国石油大学(北京)化工学院CNPC催化重点实验室,北京102249

出　　处：《分子催化》2016年第1期72-79,共8页Journal of Molecular Catalysis(China)

基　　金：国家重点基础研究发展计划(973计划;2012CB215002);国家自然科学基金(20973123);山西省自然科学基金(2013011041-1)~~

摘　　要：采用水热法,在Na2O-K2O-Al2O3-SiO2-HMBr2-H2O体系,一步法快速合成了具有T型和L型两种结构特征的T-L复合分子筛,通过XRD、N2吸附-脱附、SEM-EDX、TEM、FT-IR和TG-DTG等手段,对合成样品的物理化学性质进行了表征.结果表明：所合成的分子筛是球形L型分子筛镶嵌在椭圆体T型分子筛一侧,形成的1~2μm左右的双结构复合分子筛;孔道性质表征说明其具有微孔和介孔的多级孔道结构,微孔平均孔径为0.82nm,介孔的孔径主要分布在3.8nm左右.通过对阳离子比R=K2O/（K2O＋Na2O）影响因素进行分析,获得T型、L型及T-L复合分子筛的转化规律,R的大小在0.3~0.5nm范围内可以合成结晶度高的T-L复合分子筛.The T-L composite zeolite with the binary structures of zeolite T and zeolite L was synthesized rapidly in the system of Na2O-K2O-Al2O3-Si O2-HMBr2-H2O by a direct approach under conventional hydrothermal conditions and characterized by means of XRD,N2adsorption-desorption,SEM-EDX,TEM and FT-IR. The results showed that the synthetic sample possessed a composite phase with the mosaic morphology about 1 ~ 2 μm of zeolite L grow on one side of zeolite T particle. The promotion effect is attributed to complex pore channel structure in the T-L composite zeolite： the composite sample has hierarchical structure,coupled with an uniform micropore size of about 0. 82 nm and an average mesopore size of 3. 8 nm. The optimum atomic ratio of K2 O /（ K2 O ＋ Na2O） ranges from 0. 3 to 0. 5.

关 键 词：镶嵌结构 T-L复合分子筛 多级孔道 表征 

分 类 号：O643.3[理学—物理化学] TQ426[理学—化学]