Acta Phys. -Chim. Sin. ›› 1997, Vol. 13 ›› Issue (05): 452-454.doi: 10.3866/PKU.WHXB19970513

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Study of the Formation Mechanism of Mesoporous Molecular Sieve MCM-41

Yuan Zhong-Yong,Chen Tie-Hong,Wang Jing-Zhong,Li He-Xuan   

  1. Catalysis Laboratory,Department of Chemistry,Nankai University,Tianjin 300071
  • Received:1996-09-02 Revised:1996-11-04 Published:1997-05-15
  • Contact: Wang Jing-Zhong

Abstract:

The formation mechanism of mesoporous molecular sieve materials MCM-41 in different synthetic systems has been studied systemically. In the Na2O-(CTMA)2O-SiO2-H2O system, it is found that liquid-crystal templating mechanism should be that silica first forms silicated micelle with surfactant cation, then silica/CTMA+ micelle polymerizes with each other forming the hexagonal mesophase. The experimental results in the TMAOH-SiO2-CTMABr-H2O system supports the mechanism proposed for a surfactant-silica system from the lamellar to the hexagonal mesophase. Therefore, it is found that the formation mechanisms of MCM-41 molecular sieves are not the same under different synthetic conditions and in different synthetic systems.

Key words: Mesopore, Molecular sieve, MCM-41, Formation mechanism