MCM-48介孔分子筛的高压合成  

Synthesis of MCM-48 under High Pressure

作　　者：王树国[1] 吴东[1] 孙予罕[1] 钟炳[1] 邓风[2] 岳勇[2] 罗晴[2] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,太原030001 [2]中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室,武汉430071

出　　处：《物理化学学报》2001年第7期659-661,共3页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(29973057;29625307);国家重点基础研究专项经费(G20000480)资助项目

摘　　要：采用正硅酸乙酯（TEOS）作硅源，十六烷基三甲基溴化铵（CTAB）为模板剂，在高压（约7 MPa）和373 K下合成了MCM-48介孔分子筛.用XRD、氮气吸附及^(29)Si MAS NMR对样品进行了表征.与常压合成的相比，高压下合成的MCM-48具有更高的热稳定性和水热稳定性.^(29)Si MAS NMR结果表明，高压有利于分子筛孔壁的聚合，导致分子筛结构更加完善，从而使其具有更高的稳定性.MCM-48 was synthesized with tetraethylorthosilicate (TEOS) as silica source and cetyltrimethylammonium bromide (CTAB) as template at high pressure (ca. 7 MPa) and 373 K. The synthesized compounds were characterized using different analytical techniques such as X-ray diffraction, N-2 adsorption and desorption measurement, and Si-29 MAS NMR. MCM-48 synthesized at high pressure appeared higher thermal and hydrothermal stability than that synthesized at autogenous pressure. The Si-29 MAS NMR results demonstrated that high pressure promoted the wall polymerization and leaded to a high quality MCM-48. MCM-48 was also synthesized with such a low ratio of CTAB / Si as 0.16, but that synthesized with high ratio of CTAB / Si was more stable.

关 键 词：MCM-48 水稳定性 模板剂 热稳定性 介孔分子筛 高压合成 

分 类 号：O643.3[理学—物理化学] O647.3[理学—化学]