STRUCTURAL DEFECTS AND CATION-EXCHANGE CAPACITY IN DEALUMINATED Y-ZEOLITES

被引：19
|
作者：
SIANTAR, DP
MILLMAN, WS
FRIPIAT, JJ
机构：
[1] UNIV WISCONSIN,DEPT CHEM,MILWAUKEE,WI 53201
[2] UNIV WISCONSIN,SURFACE STUDIES LAB,MILWAUKEE,WI 53201
来源：
ZEOLITES | 1995年 / 15卷 / 06期
关键词：
ZEOLITE; CEC; NMR; XRD; CHEMICAL ANALYSIS; DEALUMINATION; ALUMINUM; SILICON;
D O I：
10.1016/0144-2449(94)00062-W
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Y zeolites obtained from solution and vapor phase dealumination treatments were characterized using cation exchange capacity, standard chemical analysis, X-ray powder diffraction, and Si-29 magic angle spinning nuclear magnetic resonance techniques. Both dealumination treatments produce nonframework silica as well as nonframework alumina. By taking into account not only the isomorphic. Al by Si substitutions but also the nonframework species, the calculated lattice charge is in agreement with the cation exchange capacity for Si:Al > 3. The crystallinity seems mainly related to the amount of dislodged silicon.
引用
收藏
页码：556 / 560
页数：5
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