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Adsorption of CO2, CH4, N2 and He on MFI, CHA and DDR zeolites
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0009-0003-5086-6662
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0002-7792-1348
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0003-1053-4623
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0003-2656-857X
2025 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 390, article id 113599Article in journal (Refereed) Published
Abstract [en]

The adsorption equilibrium isotherms of the common components of natural gas and biogas, CO2, CH4, N2, and He were experimentally measured over wide temperature ranges on all-silica MFI, CHA, and DDR zeolite crystals. First, large zeolite crystals, suitable for adsorption measurements, were synthesized and characterized by XRD and SEM. In the next step, gas adsorption data was recorded and the Toth equation was fitted to the measured adsorption data, and the adsorption capacity at saturation (Csat), affinity constant (b), and Toth heterogeneity parameter (t) were estimated. Finally, the van't Hoff equation was used to calculate the isosteric enthalpy of adsorption and adsorption entropy for all gases on each zeolite. The results reveal that the Toth equation can accurately predict the adsorption of gases on the studied microporous zeolite crystals in the investigated temperature range. To the best of our knowledge, the saturation adsorption capacity and adsorption enthalpy for helium on CHA and DDR zeolites have been determined experimentally for the first time in the present work. The estimated adsorption parameters presented in this work are accurate, primarily due to the large crystals used for the adsorption measurements and the recording of low-temperature adsorption equilibrium isotherms over broad temperature ranges. These factors are crucial for the reliability of our results, which are invaluable for understanding adsorption and mass transfer in zeolite materials, as well as for advancing the development of zeolite materials for gas separation.

Place, publisher, year, edition, pages
Elsevier B.V. , 2025. Vol. 390, article id 113599
Keywords [en]
Adsorption, Zeolites, Heat of adsorption, Entropy of adsorption, Biogas and natural gas
National Category
Chemical Engineering
Research subject
Chemical Technology
Identifiers
URN: urn:nbn:se:ltu:diva-112120DOI: 10.1016/j.micromeso.2025.113599Scopus ID: 2-s2.0-86000578350OAI: oai:DiVA.org:ltu-112120DiVA, id: diva2:1947325
Funder
Bio4EnergySwedish Research Council
Note

Validerad;2025;Nivå 2;2025-03-25 (u5);

Full text license: CC BY 4.0;

Available from: 2025-03-25 Created: 2025-03-25 Last updated: 2025-03-27Bibliographically approved

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