Adsorption of Carbon Dioxide, Methane, and Nitrogen on Zn(dcpa) Metal-Organic Framework

Rui P. P. L. Ribeiro, Isabel A. A. C. Esteves and José P. B. Mota
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Rui P. P. L. Ribeiro: LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, NOVA University of Lisbon, 2829-516 Caparica, Portugal
Isabel A. A. C. Esteves: LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, NOVA University of Lisbon, 2829-516 Caparica, Portugal
José P. B. Mota: LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, NOVA University of Lisbon, 2829-516 Caparica, Portugal

Energies, 2021, vol. 14, issue 18, 1-16

Abstract: Adsorption-based processes using metal-organic frameworks (MOFs) are a promising option for carbon dioxide (CO 2 ) capture from flue gases and biogas upgrading to biomethane. Here, the adsorption of CO 2 , methane (CH 4 ), and nitrogen (N 2 ) on Zn(dcpa) MOF (dcpa (2,6-dichlorophenylacetate)) is reported. The characterization of the MOF by powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), and N 2 physisorption at 77 K shows that it is stable up to 650 K, and confirms previous observations suggesting framework flexibility upon exposure to guest molecules. The adsorption equilibrium isotherms of the pure components (CO 2 , CH 4 , and N 2 ), measured at 273–323 K, and up to 35 bar, are Langmuirian, except for that of CO 2 at 273 K, which exhibits a stepwise shape with hysteresis. The latter is accurately interpreted in terms of the osmotic thermodynamic theory, with further refinement by assuming that the free energy difference between the two metastable structures of Zn(dcpa) is a normally distributed variable due to the existence of different crystal sizes and defects in a real sample. The ideal selectivities of the equimolar mixtures of CO 2 /N 2 and CO 2 /CH 4 at 1 bar and 303 K are 12.8 and 2.9, respectively, which are large enough for Zn(dcpa) to be usable in pressure swing adsorption.

Keywords: Zn(dcpa); MOF; framework flexibility; adsorption; gas storage; biogas; carbon capture (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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