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.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
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
