Abstract

Understanding the dynamics of mixed-gas adsorption is essential for industrial-scale adsorptive separations. Also, obtaining binary adsorption isotherms is essential to gain a better understanding of adsorbate-adsorbent interactions in multicomponent gas mixtures. Porous organic cages (POCs) are highly porous, crystalline materials, with a small average pore window that make them promising candidates for separation applications. In this work, we utilized zero-length column (ZLC) technique to not only determine the kinetics of CO2/H2 separation over CC3 but also obtain the binary adsorption isotherms. The ultra crystalline diffusivities of 1.49 x 10–4 and 8.31 x 10–5 cm2.s-1 were estimated from the ZLC desorption profiles for unary CO2 and H2 gases at 293 K, respectively, whereas in binary CO2/H2 mixture, these diffusion values were reduced by 18 and 19 times, respectively. Moreover, our results indicated that the adsorption capacities estimated from binary runs diminished by approximately 36.0% and 33.6% for CO2 and H2, respectively, relative to the unary runs. The findings of this investigation highlight the importance of the ZLC technique in providing valuable insights on mixture adsorption equilibrium and dynamics without the need for tedious and complex experiments. (Figure presented.).

Department(s)

Chemical and Biochemical Engineering

Comments

National Science Foundation, Grant PFI-2044726

Keywords and Phrases

Binary adsorption isotherms; Diffusion; Kinetics; POC; ZLC

International Standard Serial Number (ISSN)

1572-8757; 0929-5607

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Springer, All rights reserved.

Publication Date

01 Aug 2024

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