ISOTHERM OF AMMONIA ADSORPTION ON CAA (M-34) ZEOLITE
Keywords:
adsorption, adsorbent, pressure, isotherm, free energy, microcalorimeter, ammonia.Abstract
The article presents the values of the isotherm of ammonia adsorption on synthetic zeolite CaA (M-34) obtained in the experiment at 303 K in relative pressure coordinates. The adsorption isotherm was measured with high accuracy and stability using a system consisting of a Tiana-Calve type DAK-1-1A differential automated microcalorimeter connected to a universal high-vacuum device. Under the experimental conditions (523 torr), the adsorption capacity of this zeolite with respect to NH3 was expressed as 7.22 mmol/g per 1 g of zeolite. It was found that 49 % of the total adsorption was sorbed at an equilibrium pressure of 1 torr, 69 % at a pressure of 10 torr, 86 % at a pressure of 100 torr, and 100 % (7.22 mmol/g) at a pressure of 524 torr. It was proven that NH3 molecules form tetrameric 4NH3:Na with sodium cations and dimeric 2NH3:Ca2+ with calcium cations ion-molecular complexes in the first coordination sphere in positions SII and SIII of the zeolite.
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