MCM-41中孔SiO_2分子筛合成新方法  

A Novel Synthesis Method for MCM-41 Mesoporous Silica Molecular Sieves

作　　者：张兆荣[1] 索继栓[1] 张小明[1] 李树本[1] 

机构地区：[1]中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室,兰州730000

出　　处：《物理化学学报》1998年第3期243-248,共6页Acta Physico-Chimica Sinica

摘　　要：以溴代十六烷基吡啶（CPBr）为模板剂，正硅酸乙酯（TEOS）为硅源，在优化的操作条件下通过S＋X-I+路径合成了高结晶度的MCM－41中孔SiO2分子筛，并提高了其收率；以TG－DTA结果为基础，对分子筛脱模板剂的过程进行了优化，同时以XRD对合成物系中CPBr；TEOSHCl，H2O相对含量对MCM－41分子筛晶相结构的影响以及该结构的形成过程进行了分析，发现MCM－41结构沿S＋X-I+路径的形成经过了Lamellar→Hexagonal相转移历程.High quality MCM-41 Inesoporous silica molecular sieves were synthesized in high yield via improved S+X-I+ assembly patllway, by using cetylpyridinium bromide(CPBr) as tem-Plate and tetraethyl orthosilicate(TEOS) as silica sollrce. The calcination process of as-synthesizedsamples was optimized on the basis of TG-DTA results. Thus typical MCM-41 sample obtainedwas cllaracterized by powder X-ray diffraction(XRD) and N2 adsorption-desorption techniques.The effects of CPBr, TEOS, HCl and H2O contents on the MCM-41 mesostucture, as well as themechanistic steps involved in the formation of the mesophase were also investigated by XRD. Itwas found that. the titled crystal phase was developed through lamellar to hexagonal mesophasetransformation.

关 键 词：CPBr 模板剂 MCM-41 中孔 分子筛 合成 二氧化硅 

分 类 号：TQ424.25[化学工程]