Local composition activity coefficient model for mixed-gas adsorption equilibria

Harnoor Kaur, Hla Tun, Michael Sees, Chau Chyun Chen

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Taking into consideration the adsorbate–adsorbent interactions, a novel activity coefficient model is derived from the non-random two-liquid theory for mixed-gas adsorption equilibria. In contrast with the conventional activity coefficient models developed for bulk liquids, the new model correctly predicts negative deviations from ideality for adsorbed phase mixtures including azeotropic behavior exhibited by selected gas-adsorbent systems. Requiring a single binary interaction parameter per adsorbate–adsorbate pair, the model successfully correlates wide varieties of binary adsorption isotherm data and it should be a powerful engineering thermodynamic tool in correlating and predicting mixed-gas adsorption equilibria.

Original languageEnglish
Pages (from-to)951-964
Number of pages14
Issue number5
StatePublished - Jul 15 2019


  • Adsorption NRTL activity coefficient model
  • Local composition activity coefficient model
  • Mixed-gas adsorption equilibria
  • Non-random two liquid theory


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