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Flexible Adsorbents at High Pressure: Observations and Correlation of ZIF-7 Stepped Sorption Isotherms for Nitrogen, Argon, and Other Gases. | LitMetric

Flexible Adsorbents at High Pressure: Observations and Correlation of ZIF-7 Stepped Sorption Isotherms for Nitrogen, Argon, and Other Gases.

Langmuir

Fluid Science & Resources Division, Department of Chemical Engineering, University of Western Australia, Crawley, Western Australia 6009, Australia.

Published: December 2020

AI Article Synopsis

  • Stepped adsorption isotherms with desorption hysteresis were studied for various gases, including nitrogen and argon, on zeolitic imidazolate framework-7 (ZIF-7) using a gravimetric analyzer, reaching pressures up to 17 MPa.
  • The study revealed unique behaviors for nitrogen and argon that hadn't been previously reported, and required high pressures to induce structural changes in ZIF-7 at around 360 K.
  • A new semi-empirical model combining a three-parameter Langmuir equation with a temperature-dependent phase transition model was developed, showing good predictive accuracy for the adsorption and desorption processes, with deviations under 2.5% for the highest capacity measurements.

Article Abstract

Stepped adsorption isotherms with desorption hysteresis were measured for nitrogen, argon, ethane, carbon dioxide, and methane at pressures up to 17 MPa on zeolitic imidazolate framework-7 (ZIF-7) using a gravimetric sorption analyzer. Such stepped sorption isotherms have not been previously reported for nitrogen or argon on ZIF-7, and required the application of pressures as high as 15 MPa to trigger the ZIF-7 structural phase transition at temperatures around 360 K. The stepped hysteretic sorption isotherms measured for carbon dioxide, methane, and ethane were consistent with previous observations reported in the literature. To correlate these stepped hysteretic sorption isotherms, a semi-empirical model was developed by combining a three-parameter Langmuir equation to describe the Type I aspect of the isotherm, with a model designed to describe the temperature-dependent ZIF-7 structural phase transition. Excellent fits of the combined adsorption and desorption branches were achieved by adjusting nine parameters in the temperature-dependent model, with root-mean-square deviations within 2.5 % of the highest measured adsorption capacity. Each parameter of the new semi-empirical model has a physical basis, allowing them to be estimated or compared independently.

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Source
http://dx.doi.org/10.1021/acs.langmuir.0c02279DOI Listing

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