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Adsorption of CO 2 , CO, H 2 , and N 2 on Zeolites, Activated Carbons, and Metal-Organic Frameworks with Different Surface Nonuniformities

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  • Kang Hun Kim

    (Department of Environmental Engineering, Daegu University, 201 Daegudae-ro, Jillyang, Gyeongsan 38453, Republic of Korea)

  • Moon Hyeon Kim

    (Department of Environmental Engineering, Daegu University, 201 Daegudae-ro, Jillyang, Gyeongsan 38453, Republic of Korea)

Abstract

The single-component adsorption of CO 2 , CO, N 2 , and H 2 at 25 and 35 °C was studied using microporous faujasite-framework zeolites (NaY and NaX), activated carbons (GCN and MSP), and metal–organic frameworks (A100 and Z1200) as starting points for the separation of CO 2 from syngases produced by gasifying biomass-based solid wastes. The indicated adsorption isotherms and uptake of the adsorbates strongly depended on the adsorbates themselves as well as on the adsorbents because of significant differences in the surface features, such as surface nonuniformity, and in the molecular properties. The selectivity of CO 2 to the other gases also varied with the adsorbents due to the distinctive energetic characteristics. The surfaces of the zeolites were the most energetically heterogeneous ones, yielding higher CO 2 uptake at low pressures, while the two activated carbons and A100 had moderate surface heterogeneities, and MSP showed the highest CO 2 uptake at high pressures, such as 6 bar, at which the micropore volume and surface area are important. Z1200, which has highly homogeneous surfaces and no high-affinity-binding sites, exhibited the lowest CO 2 adsorption capacity regardless of equilibrated pressure. The surface nonuniformities of the six sorbents were consistent with the calculated isosteric heats of CO 2 adsorption. CO 2 could be reversibly adsorbed on NaY and MSP but not on GCN, with some metal impurities, although all these adsorbents showed a fully reversible process for CO adsorption. The estimated working capacity for CO 2 adsorption at 25 °C was 0.78–6.50 mmol/g, depending on the sorbents used. The highest value was disclosed for MSP, the surface energetic heterogeneity of which was between that of zeolites and Z1200. Such a high working capacity bodes well for use in our later applications.

Suggested Citation

  • Kang Hun Kim & Moon Hyeon Kim, 2023. "Adsorption of CO 2 , CO, H 2 , and N 2 on Zeolites, Activated Carbons, and Metal-Organic Frameworks with Different Surface Nonuniformities," Sustainability, MDPI, vol. 15(15), pages 1-20, July.
  • Handle: RePEc:gam:jsusta:v:15:y:2023:i:15:p:11574-:d:1203315
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    References listed on IDEAS

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    1. Hee K. Chae & Diana Y. Siberio-Pérez & Jaheon Kim & YongBok Go & Mohamed Eddaoudi & Adam J. Matzger & Michael O'Keeffe & Omar M. Yaghi, 2004. "A route to high surface area, porosity and inclusion of large molecules in crystals," Nature, Nature, vol. 427(6974), pages 523-527, February.
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