DIFFERENTIAL ENTROPY OF ETHANE ADSORPTION ON LTA-TYPE ZEOLITE

Juraeva Z.,  Jumaboyeva Z.,   Asfandiyorov M.,  Gaybullayeva D.

Authors

Juraeva Z., Jumaboyeva Z., Asfandiyorov M., Gaybullayeva D. Tashkent Medical Academy Namangan State Technical University, Namangan, Uzbekistan, Tashkent University of Information Technologies named after Muhammad al-Khwarizmi, The Branch of the Russian State University of Oil and Gas (National Research University) named after I.M. Gubkin in Tashkent,

Keywords:

zeolite, adsorbent, adsorption, enthalpy, entropy, mechanism, microcalorimeter, ethane.

Abstract

It was established that at the initial stage of adsorption (a<0.5 mmol/g), the differential enthalpy values reach 65-70 kJ/mol, which is associated with the strong interaction between ethane molecules and the Ca²⁺ and Na⁺ cationic centers. With further surface coverage, a gradual decrease in enthalpy to 25-30 kJ/mol is observed, indicating a transition to less energetically favorable micropores and predominantly physisorption interactions. The change in entropy increases with the degree of adsorption, reflecting a decrease in the structural order of the adsorbed layer. The results provide deeper insight into the energetic heterogeneity of the zeolite surface and the adsorption mechanism of hydrocarbons in microporous aluminosilicate frameworks.

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DIFFERENTIAL ENTROPY OF ETHANE ADSORPTION ON LTA-TYPE ZEOLITE

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