The Effect of Initial pH on the Synthesis of Mesoporous Molecular Sieve, MCM-41

MCM-41 분자체의 합성에 초기 pH가 미치는 영향

  • Kim, Wha-Jung (Dept. of Industrial Chemistry, College of Engineering., Kon Kuk University) ;
  • Yoo, Jae-Churl (Dept. of Industrial Chemistry, College of Engineering., Kon Kuk University)
  • 김화중 (건국대학교 공과대학 공업화학과) ;
  • 유재철 (건국대학교 공과대학 공업화학과)
  • Received : 1997.02.03
  • Accepted : 1997.04.24
  • Published : 1997.06.10

Abstract

A mesoporous molecular sieve, MCM-41, was synthesized and the effent of various initial pH of reaction mixtures on the synthesis and physical properties of MCM-41 was investigated. Adjustment of initial pH for reaction mixtures was made before starting hydrothermal reaction rather than during the reaction. Highly crystalline MCM-41 which shows pore diameters of $30{\AA}$ to $40{\AA}$ and specific surface areas greater than $1000m^2/g$ has been successfully prepared through a single adjustment of initial pH. Results also suggest that the initial pH adjustment has a significant effect on the formation of MCM-41 with a long-range ordered hexagonal array and an excellent thermal stability. Finally, it is speculated that the adjustment of initial pH might accelerate the dissolution of stable polymeric sodium silicate to highly reactive monomeric sodium silicate resulting in well-ordered MCM-41.

Keywords

Acknowledgement

Supported by : 건국대학교

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