以聚乙二醇/十六烷基三甲基溴化铵为模板剂制备MCM-41分子筛

Preparation of MCM-41 molecular sieve with PEG/CTAB as template agent

通过将聚乙二醇(1PEG)直接引入MCM-41分子筛合成模板剂十六烷基三甲基溴化铵溶液中,经脱洗和焙烧处理得到厚孔壁有序介孔材料。选用X射线衍射(XRD)、透射电子显微镜(TEM)和等温吸附(BET)对样品进行了表征,结果显示,添加PEG的合成产物孔壁厚度增加,孔壁厚度可达1.45 nm,孔径尺寸和比表面积减小,有序性降低,低相对分子质量PEG的添加有助于厚孔壁产物生成。

Polyethylene glycol （PEG） was introduced into cetyhrimethylammonium bromide （CTAB） solution that used as template agent for preparation of MCM - 41 molecular sieve. After washing and calcinations, product of ordered mesoporous material was obtained. The product was characterized with XRD,TEM and BET isothermal adsorption. The results showed that as compared with the product that without introducing the PEG, the pore wall thickness is increased,which can achieve 1.45 nm, while the pore size and specific surface area are reduced. The degree of ordering is reduced too. This experiment indicated that the introduction of low molecular weight PEG facilitates the formation of swollen pore wall MCM -41 molecular sieve products.