ADSORPTION AND XE-129 NMR OF XENON IN SILVER-EXCHANGED Y-ZEOLITES - APPLICATION TO THE LOCATION OF SILVER CATIONS

被引：37
|
作者：
GROSSE, R
GEDEON, A
WATERMANN, J
FRAISSARD, J
BODDENBERG, B
机构：
[1] UNIV EDINBURGH,LEHRSTUHL PHYS CHEM 2,OTTO HAHN STR 6,EDINBURGH EH8 9YL,MIDLOTHIAN,SCOTLAND
[2] UNIV PARIS 06,CNRS,URA 1428,CHIM SURFACES LAB,F-75230 PARIS 05,FRANCE
来源：
ZEOLITES | 1992年 / 12卷 / 08期
关键词：
XE-129; NMR; AG+ EXCHANGED Y-ZEOLITES; XENON ADSORPTION ISOTHERMS;
D O I：
10.1016/0144-2449(92)90154-H
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：
The adsorption isotherms and Xe-129 n.m.r. chemical shifts of xenon in silver-exchanged yAgNaY zeolites (y from 5 to 100%) after high-temperature (400-degrees-C) dehydration as well as subsequent oxidation were measured at 26-degrees-C. A three-site sorption model taking into account adsorbate-adsorbate interaction was developed that reproduces simultaneously the adsorption isotherms and the chemical shift vs. concentration curves up to xenon loadings of about 6 atoms/supercage. The upfield displacements of the chemical shifts in the silver-exchanged zeolites with respect to NaY are attributed to the interaction of xenon with a small portion of the supercage silver cations, probably those unlocalized or residing on crystallographic SIII sites.
引用
收藏
页码：909 / 915
页数：7
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