MICROPOROUS CHARACTERISTICS OF H-Y, H-ZSM-5 AND H-MORDENITE DEALUMINATED BY CALCINATION

被引：52
|
作者：
HONG, Y
FRIPIAT, JJ
机构：
[1] UNIV WISCONSIN,DEPT CHEM,MILWAUKEE,WI 53201
[2] UNIV WISCONSIN,SURFACE STUDIES LAB,MILWAUKEE,WI 53201
来源：
MICROPOROUS MATERIALS | 1995年 / 4卷 / 05期
关键词：
ZEOLITE Y; ZSM-5; MORDENITE; MICROPORE; DEALUMINATION;
D O I：
10.1016/0927-6513(95)00038-B
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The modifications of the microporous volume of zeolites resulting from thermal dealumination have been examined by measuring the changes in the unit cell parameters as well as the N-2 and n-pentane adsorption isotherms. For the cubic HY and orthorhombic H-ZSM-5 zeolites, the differential decrease of the microporous volume per nonframework aluminum (NFAl) can be predicted by assuming NFAl is concentrated in pores available to N-2. For the orthorhombic H-mordenite, NFAl is homogeneously spread in all pores, available or not to N-2. The Gurvitch rule (volume of adsorbed N-2=volume of adsorbed pentane) is respected in HY and H-ZSM-5, but not in H-mordenite, irrespective of the degree of dealumination.
引用
收藏
页码：323 / 334
页数：12
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