Acta Phys. -Chim. Sin. ›› 2001, Vol. 17 ›› Issue (07): 659-661.doi: 10.3866/PKU.WHXB20010718

• Note • Previous Articles     Next Articles

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

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