Far-IR spectroscopic studies on zeolite NaCaA

R V , Jasra and N V , Choudary and K V, Rao and G C, Pandey and S G T , Bhat (1993) Far-IR spectroscopic studies on zeolite NaCaA. Chemical Physics Letters , 211 (2-3). pp. 214-219.

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Abstract

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.

Item Type:	Article
Subjects:	Science > Chemistry
ID Code:	904
Deposited By:	Prof Balasubramanian Viswanathan
Deposited On:	14 Jun 2007 08:50
Last Modified:	14 Jun 2007 08:50

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