CHARACTERIZATION OF THE ACIDITY OF FAUJASITE-AND PENTASIL-ZEOLITES BY CALORIMETRIC MEASUREMENTS OF THE AMMONIA CHEMISORPTION

被引：9

作者：

Stach, H. ^{[1
]}

Wendt, R. ^{[1
]}

Lohse, U. ^{[1
]}

Jaenchen, J. ^{[1
]}

Spindler, H. ^{[2
]}

机构：

[1] Acad Sci GDR, Cent Inst Phys Chem, D-1199 Berlin, Germany

[2] VEB Leuna Werke, Leuna, Germany

来源：

CATALYSIS TODAY | 1988年 / 3卷 / 05期

关键词：

D O I：

10.1016/0920-5861(88)87025-1

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Using the methods of calorimetric and iaosteric measurements of the ammonia adsorption, it is found that the lower limit of the heat of chemisorption in H-Y- and H-ZSM-5-zeolites is 60 kJ/mol. Dealumination of the Y- and ZSM-5-zeolites changes the total number of the acid sites as well as the strength and the strength distribution of the Bronsted sites. Within a margin of error of +/- 10 %, there is a coincidence of the number of measured end calculated Bronsted sites (from the Al-content of the frame-work) in H-Y-zeolites.

引用

页码：431 / 436

页数：6

共 5 条

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