A STUDY OF THE DISTRIBUTION OF SODIUM-CATIONS IN THE ZEOLITES NAX, NAY AND ZNNAY USING CARBON-MONOXIDE ADSORPTION AND NA-23 NMR TECHNIQUES

被引:0
|
作者
SEIDEL, A [1 ]
BODDENBERG, B [1 ]
机构
[1] UNIV DORTMUND, LEHRSTUHL PHYS CHEM 2, D-44227 DORTMUND, GERMANY
来源
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES | 1995年 / 50卷 / 2-3期
关键词
NA-23; NMR; ADSORPTION; CARBON MONOXIDE; ZEOLITES; ZINC EXCHANGE;
D O I
暂无
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 zeolites NaX, NaY, Zn(55)NaY, and Zn(74)NaY were investigated by means of carbon monoxide adsorption and with static and magic angle spinning (MAS) Na-23 NMR spectroscopy. The Na+ distribution between the sodalite (beta)- and supercages of the fully hydrated zeolites NaX and NaY were found to agree with XRD results. In the hydrated zinc-exchanged zeolites the Na+ ions almost exclusively populate the beta-cages. The adsorption isotherms of CO in the dehydrated zeolites were analyzed quantitatively to yield the concentrations of Na+ residing in the supercages. The measured static and MAS Na-23 NMR spectra were analyzed by comparing their widths and shapes with simulated central transition patterns and yield, inter alia, the concentrations of Na+ associated with the spectrum components. Arguments are put forward that Na-23 NMR of dehydrated zeolites is well suited to distinguish Na+ cations in highly symmetric environments and mobile Na+ species from others located on general positions, but further resolution is hardly feasible.
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页码:199 / 210
页数:12
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