Detection and estimation of Bronsted acidities in alkali metal cation exchanged X and Y zeolites

被引：23

作者：

Thomas, KJ ^{[1
]}

Ramamurthy, V ^{[1
]}

机构：

[1] Tulane Univ, Dept Chem, New Orleans, LA 70118 USA

来源：

LANGMUIR | 1998年 / 14卷 / 23期

关键词：

D O I：

10.1021/la980631v

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

An "indicator titration" method that can identify the acidity of a zeolite is presented. This method is particularly useful when the zeolite possesses acidity that is below the detection limit of conventional techniques such as MAS NMR. However, this technique underestimates the extent of acidity of zeolites that contain a large number of acidic sites such as in CaY and KY. On the basis of this technique, the commonly available alkali metal exchanged Y zeolites are estimated to contain one acidic site per similar to 116 aluminums. In contrast to Y, the alkali metal exchanged X zeolites do not contain enough Bronsted acid sites to be detected by this technique.

引用

页码：6687 / 6692

页数：6

共 32 条

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