Acta Chimica Sinica ›› 1999, Vol. 57 ›› Issue (9): 1014-1021. Previous Articles     Next Articles

Original Articles

MCM-41分子筛的改性、表面结构与吸附性质的研究

龙英才;许太明;董维阳;孙尧俊   

  1. 复旦大学化学系.上海(200433);复旦大学分析测试中心.上海(200433)
  • 发布日期:1999-09-15

Studies on the modification, surface structure and adsorption of MCM- 41 mesoporous molecular sieve

Long Yingcai;Xu Taiming;Dong Weiyang;Sun Yaojun   

  1. Fudan Univ, Dept Chem.Shanghai(200433);Fudan Univ, Ctr Anal & Measurement.Shanghai(200433)
  • Published:1999-09-15

High silica MCM-41 and modified samples were characterized in detail with XRD, ^2^9Si and ^1^3C CP MAS NMR, and adsorption isotherms of nitrogen, water and cyclo-hexane. The modification reagents used were trimethylchlorosilane, dimethyldichlorosilane, methyltrichlorosilane, silicon tetrachloride and methyliodide. The modification greatly varies the surface structure, decreases the pore diameter, and increases the wall thickness. A linear relationship between the contents of silanol groups and the amounts of water and cyclohexane absorbed reveals the nature of adsorption centers in the samples.

Key words: NMR SPECTROMETRY, MODIFICATION, SURFACE STRUCTURE, ADSORPTION, PORE SIZE DISTRIBUTION, CHLOROSILANE, IODOMETHANE

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