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Abstract <p>The adsorption of methane onto an La–BTC metal–organic framework (MOF)was investigated within a pressure range of 0.1−40 MPa at supercritical temperatures of 303, 313, 323, and 333 K. The isotherms of excess adsorption were measured, the adsorption volumes were evaluated, and the isotherms of the total content were calculated, as well as the differential isosteric and initial heats of methane adsorption. Analysis of the obtained results revealed the incompleteness of the gas-adsorption process in the La–BTC MOF in the studied pressure range, which is indicated by the impossibility of fulfilling the condition of equality of the adsorbate and adsorptive densities. The same effect was observed in the previously studied adsorption systems based on other MOFs (Zr–BDC and Al–BTC) and carbon adsorbents. The porous structure of the La–BTC adsorbent was assumed to be the cause of the observed peculiarities of the methane adsorption process.</p>

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Adsorption of Methane in a Metal–Organic-Based Adsorbent La–BTC at Supercritical Temperatures

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • A. A. Pribylov,
  • A. E. Grinchenko,
  • K. O. Murdmaa

摘要

Abstract

The adsorption of methane onto an La–BTC metal–organic framework (MOF)was investigated within a pressure range of 0.1−40 MPa at supercritical temperatures of 303, 313, 323, and 333 K. The isotherms of excess adsorption were measured, the adsorption volumes were evaluated, and the isotherms of the total content were calculated, as well as the differential isosteric and initial heats of methane adsorption. Analysis of the obtained results revealed the incompleteness of the gas-adsorption process in the La–BTC MOF in the studied pressure range, which is indicated by the impossibility of fulfilling the condition of equality of the adsorbate and adsorptive densities. The same effect was observed in the previously studied adsorption systems based on other MOFs (Zr–BDC and Al–BTC) and carbon adsorbents. The porous structure of the La–BTC adsorbent was assumed to be the cause of the observed peculiarities of the methane adsorption process.