以混合阳离子-嵌段共聚物表面活性剂为模板合成介孔MCM-48  

Synthesis of Mesoporous MCM-48 by Using Mixed Cationic-Triblock Copolymer Surfactants as Template

作　　者：刘春艳[1] 荣志红[1] 王小青[1] 

机构地区：[1]辽宁师范大学化学化工学院,大连116029

出　　处：《无机化学学报》2008年第7期1068-1072,共5页Chinese Journal of Inorganic Chemistry

基　　金：辽宁省教育厅高等学校科学研究项目(No.05L217)。

摘　　要：利用阳离子和嵌段共聚物混合表面活性剂为模板,在水热条件、碱性介质中成功地合成出MCM-48介孔分子筛。在1TEOS(正硅酸乙酯)∶0.125CTAB(十六烷基三甲基溴化铵)∶nP123(聚氧乙烯-聚氧丙烯-聚氧乙烯三嵌段共聚物)∶0.50NaOH(氢氧化钠)∶61H2O(物质的量的比)体系中,n值在较大范围内(0.000625～0.01875)可调。通过粉末X射线衍射(XRD)、N2物理吸附、扫描电镜(SEM)对合成样品进行表征。结果表明:聚氧乙烯-聚氧丙烯-聚氧乙烯三嵌段共聚物(P123)的加入可以更大程度地降低合成MCM-48所需阳离子表面活性剂的用量;合成的MCM-48具有高比表面积、高度有序的孔道结构、较集中的孔径分布和较高的热和水热稳定性。Using mixed cationic-nonionic triblock copolymer surfactants as template,MCM-48 mesoporous molecular sieves were hydrothermally synthesized in alkaline medium.In 1TEOS（tetraethyl orthosilicate）：0.125CTAB（cetyltrimethylammonium bromide）∶nP123（polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer）∶0.50NaOH（sodium hydroxide）∶61H2O（molar ratio） system with n value in the range of 0.000 625～ 0.018 75.The resulting samples were characterized by XRD,N2 adsorption-desorption and SEM methods.The results show that the consumption of cationic surfactant for synthesizing MCM-48 can be greatly reduced by using polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer（P123） as co-template.In addition,MCM-48 synthesized has high BET surface area,highly ordered pore structure,narrow pore size distribution and higher hydrothermal stability.

关 键 词：MCM-48 混合表面活性剂 聚氧乙烯-聚氧丙稀-聚氧乙烯三嵌段共聚物 水热稳定性 

分 类 号：O613.72[理学—无机化学]