用双表面活性剂为共模板合成中孔分子筛MCM-48

利用水热法以非离子表面活性剂聚乙二醇辛基苯基醚和阳离子表面活性剂十六烷基三甲基溴化铵为共模板合成了中孔分子筛MCM-48.实验中发现利用较强的范德华力和氢键,聚乙二醇辛基苯基醚可在很大程度上降低合成MCM-48所需阳离子表面活性剂的用量,且利于制备有序性好、骨架聚合度高、稳定性好的MCM-48.通过调节聚乙二醇辛基苯基醚与十六烷基三甲基溴化铵的比例,可得到不同物相结构的分子筛.

The Synthesis of Mesoporous Molecular Sieve MCM-48 Using Two surfactants As Co-template

A convenient synthesis of mesoporous molecular sieve MCM-48 by hydrothermal method using non-ionic surfactant p-Octyl polyethylene glycol phenyl ether and cationic surfactant cetyltrimethyl-ammoniun bromide as co-template is reported. In this approach, nonionic surfactant p-Octyl polyethylene glycol phenyl ether by strong van der Waals and hydrogen bonding can greatly lower the amount of cationic surfactant necessary to synthesize molecular sieve MCM-48, at the same time, the with introduction of nonionic surfactant to the mixed surfactants micelle more extensively cross-linked framework and therefore higher thermal stability and higher crys-tallinity MCM-48 mesoporous molecular sieves were obtained. The synthesis was conducted at a very low mass fraction of mixed surfactants (about 4. 6% ) and a very low molar ratio of total surfactants to silica (about 0. 152: 1) . Several mesoporous molecular sieves could be prepared by simply adjusting the molar ratio of p-Octyl polyethylene glycol phenyl ether to cetyltrimethyl-ammoniun bromide within a certain range.