FAR-IR SPECTROSCOPIC STUDIES ON ZEOLITE NACAA

被引：7
|
作者：
JASRA, RV [1 ]
CHOUDARY, NV [1 ]
RAO, KV [1 ]
PANDEY, GC [1 ]
BHAT, SGT [1 ]
机构：
[1] INDIAN PETROCHEM CORP LTD,RES CTR,VADODARA 391345,INDIA
来源：
CHEMICAL PHYSICS LETTERS | 1993年 / 211卷 / 2-3期
关键词：
D O I：
10.1016/0009-2614(93)85188-T
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 location of sodium and calcium cations in zeolite A has been studied using far-IR spectroscopy. Spectroscopic measurements show a shift in the vibrational spectra with the partial replacement of Na+ by Ca2+ cations in the zeolite matrix. The magnitude of these shifts is observed to be dependent upon the location of the exchanged cations in the matrix; the effect being more prominent in the region 170-230 cm-1. The zeolite having highest calcium content shows a new band at around 231 cm-1. Our studies show that for up to 76% calcium exchange of the zeolite, the calcium cations are located only at site A. When calcium exchange is 95%, these cations are located at sites B and C with no cation observed at site A. The unusual adsorption behavior of high calcium zeolite A has been ascribed to the calcium cations located at site B.
引用
收藏
页码：214 / 219
页数：6
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