Surface acidity of MCM-41 by in situ IR studies of pyridine adsorption

被引：260

作者：

Chakraborty, B ^{[1
]}

Viswanathan, B ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Chem, Madras 600036, Tamil Nadu, India

来源：

CATALYSIS TODAY | 1999年 / 49卷 / 1-3期

关键词：

MCM-41; MAS NMR; in situ IR; pyridine;

D O I：

10.1016/S0920-5861(98)00431-3

中图分类号：

O69 [应用化学];

学科分类号：

081704 [应用化学];

摘要：

The nature and concentration of the acid sites of MCM-41 material as a function of Si/Al ratio have been monitored by in situ IR using pyridine as a probe molecule. The thermal stability of aluminium in the framework of these materials is studied using Al-27 MAS NMR spectroscopy. The tetrahedral to octahedral aluminium ratio is found to increase with higher aluminium incorporation. The sample with the lowest Si/Al ratio is found to exhibit higher acidity compared to the other samples. However, the acidity of these mesoporous aluminosilicates is less compared to the conventional H-Y zeolite. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：253 / 260

页数：8

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