物理化学学报 >> 2001, Vol. 17 >> Issue (07): 659-661.doi: 10.3866/PKU.WHXB20010718

研究简报 上一篇    下一篇

MCM-48介孔分子筛的高压合成

王树国;吴东;孙予罕;钟炳;邓风;岳勇;罗晴   

  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;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
  • 收稿日期:2001-11-27 修回日期:2001-03-08 发布日期:2001-07-15
  • 通讯作者: 王树国 E-mail:wangshuguo@yahoo.com

Synthesis of MCM-48 under High Pressure

Wang Shu-Guo;Wu Dong;Sun Yu-Han;Zhong Bing;Deng Feng;Yue Yong;Luo Qin   

  1. State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Aca demy of Sciences ,Taiyuan 030001;State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics,Wuhan I nstitute of Physics and Mathematics,Chinese Academy of Sciences,Wuhan 430071
  • Received:2001-11-27 Revised:2001-03-08 Published:2001-07-15
  • Contact: Wang Shu-Guo E-mail:wangshuguo@yahoo.com

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29Si 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.2 9Si 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.

关键词: MCM-48, 介孔, 模板剂, 高压, 水热稳定性

Abstract: MCM-48 was synthesized with tetraethylorthosilicate (TEOS) as silica source and cetyltrimethylammonium bromide (CTAB) as template at high pressure (c a.7 MPa) and 373 K. The synthesized compounds were characterized using different analytical techniques such as X-ray diffraction,N2 adsorption and desorption m easurement,and 29Si MAS NMR.MCM-48 synthesized at high pressure appeared higher thermal and hydrothermal stability than that synthesized at autogenous pressure .The 29Si MAS NMR results demonstrated that high pressure promoted the wall poly merization and leaded to a high quality MCM-48.MCM-48 was also synthesized wit h such a low ratio of CTAB/Si as 0.16,but that synthesized with high ratio of CT AB/Si was more stable.

Key words: MCM-48, Mesopore, Template, High pressure, Hydrothermal stability