物理化学学报 >> 1999, Vol. 15 >> Issue (04): 333-337.doi: 10.3866/PKU.WHXB19990409

研究论文 上一篇    下一篇

MCM-41分子筛合成与模版剂回收新方法

张兆荣, 索继栓, 张小明, 李树本   

  1. 中国科学院兰州化学物理研究所枪击合成与选择氧化国家重点实验室，兰州 730000
  • 收稿日期:1998-07-10 修回日期:1998-10-26 发布日期:1999-04-15
  • 通讯作者: 李树本

Novel Methods for the Synthesis of MCM-41 Mesoporous Molecular Sieves and the Recovery of Template

Zhang Zhao-Rong, Suo Ji-Shuan, Zhang Xiao-Ming, Li Shu-Ben   

  1. State Key Laboratory for Oxo Synthesis and slective oxidation,Lanzhou Institute of Chemical Physics,Academia Sinica,Lanzhou 730000
  • Received:1998-07-10 Revised:1998-10-26 Published:1999-04-15
  • Contact: Li Shu-Ben

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摘要：

研究了以溴代十六烷基吡啶（CPBr）为模板剂，正硅酸乙酯（TEOS）为硅源，在强酸性介质中形成MCM-41介孔分子筛六方晶相的过程中，HCI／TEOS对分子筛结构的影响．发现随HCI／TEOS提高，分子筛结晶度、晶胞参数、孔道壁厚明显增加，孔径呈减少趋势．同时还发现包结于分子筛孔道中的CPBr100％可以通过丙酮／水混合溶剂萃取回收．据此，本文对MCM-41分子筛的“S+X-I+”超分子组装机理及分子筛孔道内模板剂的存在状态进行了进一步探讨．

关键词: MCM-41分子筛, 溴代十六烷基吡啶, 合成, 模版剂回收

Abstract:

The effect of HCl content on the structural properties of the MCM-41 mesophase synthesized via the S+X-I+ assembly using cetylpyridinium bromide (CPBr) as the template and the tetraethylorthosilicate (TEOS) as silica source has been studied. It was found that with the decrease of TEOS/HCl ratio, the crystallinity, unit cell parameter and pore wall thickness of the MCM-41 silica increased, accompanied by the decrease in the mean pore size. While the efforts contributed to the template removal provided evidence that 100% of the CPBr encapsulated in the as-synthesized mesophase was recoverable by using acetone/water (1: 1 V/ V ) as the extractive agent. The mechanism for the formation of the titled mesophase, as well as the association of CPBr with the framework of the composite have also been discussed.

Key words: MCM-41, Cetylpyridinium bromide, Synthesis, Template removal