CHARACTERIZATION OF THE CATIONIC EXCHANGES IN A-ZEOLITES BY MEANS OF THE VIBRATIONAL FREQUENCIES OF THE CATIONS

被引:16
作者
BOUMIZ, A [1 ]
CARTIGNY, J [1 ]
DELARA, EC [1 ]
机构
[1] UNIV PARIS 06,CNRS,RECH PHYS LAB,4 PL JUSSIEU,TOUR 22,F-75252 PARIS 05,FRANCE
关键词
D O I
10.1021/j100192a044
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 far-infrared spectra of A-type zeolite samples show broad bands sensitive to cationic exchange. We present the far-infrared spectra of five A zeolites with Li+, Na+, K+, or Ca2+ cations. The vibrational frequencies of the exchangeable cations with respect to the anionic framework have been calculated, taking in account the ions of eight sodalite units. In the potential interaction between cation and framework (electrostatic, polarization, dispersion, and repulsion), the repulsion constants are determined by a combination method, and the effective ionic charges by the orbital electronegativity method.
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页码:5419 / 5424
页数:6
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