Studies on structure and acid-base properties of high silica MFI-type zeolite modified with methylamine

被引：25

作者：

Han, AJ

He, HY

Guo, J

Yu, H

Huang, YF

Long, YC

机构：

[1] Fudan Univ, Dept Chem, Shanghai Key Lab Mol Catalysis & Innovat Mat, Shanghai 200433, Peoples R China

[2] Fudan Univ, Ctr Anal & Measurement, Shanghai 200433, Peoples R China

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2005年 / 79卷 / 1-3期

基金：

中国国家自然科学基金;

关键词：

amine substitution; high silica MFI-type zeolite; interaction; modification; adsorption; acid-base properties;

D O I：

10.1016/j.micromeso.2004.11.001

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Investigations with XRD, C-13 and Si-29 MAS NMR, FT-IR, NH3-TPD and CO2-TPD, nitrogen adsorption, composition analysis and TG/DTG/DTA real that adsorbed methylamine (MA) strongly interacts with the framework of high silica MFI-type zeolite. The interaction results in the structural symmetry of MFI zeolite changing from monoclinic to orthorhombic. At 298K the H atom of the amine group attacks the [Si-O] framework to form O---H---N bonds. On raising the temperature to 323K, the signal belonging to Si-N connection appears in the FT-IR spectrum and Si-29 MAS NMR pattern of the modified zeolite, respectively, showing a linkage of Si-N-Si in the framework. The MA modified MFI zeolite exhibits evident and strong basic properties. (c) 2004 Elsevier Inc. All rights reserved.

引用

收藏

页码：177 / 184

页数：8

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