O. V. YERIOMIN

230

entary analysis. F

calculation standard thermodynamic

o

nd G. Cao, “A New Method of Estimating

supplemor our example, the handbook

[7] contains one enthalpy value for natrolite, and differ-

ence between maximum and minimum values for dehy-

drated analcime is 15.4 kJ/mole (~0.6%). For this un-

certainty the divergence of estimations on (6) for all con-

sidered in article substances does not exceed 1%.

Evaluation on (6) gives for all Na-zeolites enthalpy

value of zeolitic water equal to –326.7 kJ/mole. This

energy of water is more preferable that ones in structure

of ice-I –292.7 kJ/mole [12].

The considered method has restriction in the applica-

bility only to Na-zeolites, but can be extended by addi-

tion in system of calcium, magnesium and (or) others

chemical elements.

. Conclusions 4

The method of

p- tentials for Na-zeolites has been proposed on the

basis of dual solutions of linear programming problems.

The re- sults of estimation have acceptable accuracy with

pub- lished experimental and predicted data. The pre-

sented method does not demand any information about

crystal structure of zeolites and can be applied to any of

their stoichiometric presentation.

. References 6

1] J. Shi, G. Lu a[

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Porous Materals, Vol. 15, No. 5, 2008, pp. 513-517.

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[2] R. Mathieu and Ph. Vieillard, “A Predictive Model for

the Enthalpies of Formation of Zeolites,” Microporous

and Mesoporous Materials, Vol. 132, No. 3, 2010, pp.

335-351.doi:10.1016/j.micromeso.2010.03.011

[3] K. V. Chudnenko, “Thermodynamic Modelling in Geo-

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[4] O. V. Yeriomin, S. V. Vinnichenko and G. A. Yurgenson,

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[7] T. L. Wood and R. M. Garrels, “Thermodynamic Values

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Oxford University Press, Oxford, 1987, p. 265.

[8] A. A. Ravdel and A. M. Ponomariova, “The Brief Hand-

book of Physico-chemical Data,” in Russian, Khimiya,

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[9] L. P. Ogorodova, L. V. Melchakova and I. A. Kiseleva,

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[10] E. C. Moloy, Q. Liu and A. Navrotsky, “Formation and

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88, No. 1-3, 2008, pp. 283-292.

doi:10.1016/j.micromeso.2005.09.020

[11] V. V. Bakakin and Yu. V. Seryotkin, “Unified Formula

and Volume Characteristics in Comparative Crystal

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doi:10.1007/s10947-009-0199-4

[12] L. Mercury, Ph. Vieillard and Y. Tardy, “Thermodynam-

ics of Ice Polymorphs and “ice-like” water in hydrates

and hydroxides,” Applied Geochemistry, Vol. 16, No. 2,

2001, pp. 161-181. doi:10.1016/S0883-2927(00)00025-1

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