DIFFERENTIAL ENTHALPY OF AMMONIA ADSORPTION ON ZEOLITE CAA (M-34)
Keywords:
adsorption, adsorbate, differential heat, enthalpy, free energy, entropy, pressure, microcalorimeter, ammonia.Abstract
The article presents experimentally obtained values of the differential enthalpy of ammonia adsorption in synthetic zeolite CaA (M-34) at a temperature of 303 K. The differential enthalpy of adsorption was measured using a system consisting of a differential automatic microcalorimeter of the Tiana-Calve type DAK-1-1A type, connected to a universal high-vacuum device, has high accuracy and stabilityg). In zeolite CaA (M-34), a regular relationship was established between the adsorption value and the energy properties of ammonia molecules, as well as the sorption mechanism from the initial adsorption region to the region of ammonia condensation heat, and the patterns of filling the zeolite volume with ammonia molecules were determined. It has been proven that ammonia molecules form tetra 4NH3:Na+ in the first coordination sphere with sodium cations in positions SII and SIII of the zeolite and dimer 2NH3:Ca2+ in the first coordination sphere with calcium cations. It has been proven that the value of the differential enthalpy of ammonia adsorption depends on the type of cation in the zeolite.
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References
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