Influence of the Nature of the Non-Framework Cations on the Sorption Properties of Natural Stilbite

Abstract

A natural zeolite of stilbite type, collected from the Deccan traps (Aurangabad, M.S., India), has been investigated for its selectivity sequence in exchanging extra-framework cations for the first time, using Ca²⁺, Sr²⁺, Ba²⁺, Mg²⁺, Na⁺ and Ag⁺ cations as the probe cations. The different cation-exchanged forms were characterised by X-ray powder diffraction, IR spectroscopy, TG/DTA, chemical analysis and water sorption capacity.

Water sorption isotherms in the temperature range 303–393 K were obtained as a function of different non-framework cations up to a pressure of 22 Torr. The sorption data were analysed in terms of different sorption models. The characteristics and population of the non-framework cations were found to influence the chemical affinity for water sorbate almost in a similar trend.

Get full access to this article

View all access options for this article.

References

Barrer

R.M.

(1950) J. Chem. Soc. 2342.

Breck

D.W.

(1974) Zeolite Molecular Sieves, John Wiley & Sons, New York.

Coughlan

Kilmartin

S.J.

(1975a) J. Chem. Soc., Faraday Trans. 1 71, 1809.

Coughlan

Kilmartin

S.J.

(1975b) J. Chem. Soc., Faraday Trans. 1 71, 1818.

Dubinin

M.M.

Radushkevich

L.V.

(1947) Proc. Acad. Sci. USSR 55, 351.

Flanigen

E.M.

Khatami

Szymansky

(1971) Adv. Chem. Ser. No. 1, Molecular Sieve Zeolites I, Am. Chem. Soc., Washington, DC, p. 201.

Galli

Gottardi

(1966) Miner. Petrogr. Acta 12, 1.

Kasture

M.W.

Joshi

P.N.

Soni

H.S.

Joshi

V.V.

Choudhari

A.L.

Shiralkar

V.P.

(1998) Adsorp. Sci. Technol. 16, 135.

Meier

W.M.

Olson

D.H.

(1992) Zeolites 12, 175.

10.

Shiralkar

V.P.

Kulkarni

S.B.

(1983) Z. Phys. Chem. (Leipzig) 265, 313.

11.

Sips

R.J.

(1948) J. Chem. Phys. 16, 491.

12.

Walker

G.P.L.

(1960) Mineral. Mag. 32, 503.

13.

Zhdanov

S.P.

Kiselev

A.V.

Lygin

V.J.

Tilov

T.J.

(1964) Zh. Fiz. Khim. 38, 2408.

14.