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Thermodynamic properties of the natural zeolite gmelinite at low temperatures

✍ Scribed by I.E. Paukov; ; I.A. Belitsky; ; Y.A. Kovalevskaya

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
133 KB
Volume
33
Category
Article
ISSN
0021-9614

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✦ Synopsis

The heat capacity of the natural zeolite gmelinite Na 1.39 K 0.01 Ca 0.21 Fe 0.01 Al 1.83 Si 4.17 O 12 β€’ 5.87H 2 O was investigated from (5.8 to 302.2) K. The measurements were carried out using a small calorimeter cell of internal volume of 2 cm 3 sealed with a threaded lid. To test the accuracy of the calorimetric system, the heat capacity of benzoic acid was measured from (5.6 to 312) K and compared with reliable reference data. Experimental data on the molar heat capacity C p,m of gmelinite are listed, together with the tabulated thermodynamic functions. Anomalous behavior of the C p,m function was found at T > 160 K. It is suggested that the additional contribution to the heat capacity is a result of the disordering in the (water, cations) subsystem of gmelinite.

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