Comparison of Heterogeneous Langmuirian Models for Mixed-Gas Adsorption Equilibria

Journal Article · 01 May 2023 · Industrial and Engineering Chemistry Research

DOI: https://doi.org/10.1021/acs.iecr.3c00318 · OSTI ID:2228728

Sees, Michael D. ^[1]; Hamid, Usman ^[1]; Otulana, Yinka ^[1]; Chen, Chau-Chyun  ^[1]

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1. Texas Tech University, Lubbock, TX (United States)

Mixed-gas adsorption remains a very active area of research, where newly proposed adsorption equilibrium models need to be compared to standards in the field. The generalized Langmuir (gL) isotherm, proposed by Hamid et al. to address adsorption of different size molecules on heterogeneous adsorbents without requiring evaluation of the Gibbs isotherm, has thus far been tested mainly against the adsorbed solution theory (AST). The gL isotherm was shown to be thermodynamically consistent and gave either better or similar representation than AST models. Here, the gL isotherm is contrasted with the Dual-Process Langmuir isotherm popularized by Ritter and his co-workers and the Loading Ratio Correlation popularized for simple mixtures, both of which are considered the “standard” models for process simulation. Furthermore, the comparison is based on their theoretical roots, interpretations, and representation of the equilibrium loading and the isosteric enthalpy of adsorption of unary, binary, and ternary mixtures of various gaseous adsorbates on different adsorbents over a range of experimental pressures and temperatures.

• Research Organization: RAPID Manufacturing Institute, New York, NY (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• Grant/Contract Number: EE0007888
• OSTI ID: 2228728
• Journal Information: Industrial and Engineering Chemistry Research, Vol. 62, Issue 18; ISSN 0888-5885
• Publisher: American Chemical Society (ACS)Copyright Statement
• Country of Publication: United States
• Language: English