Expanding Pore Size of Al-BDC Metal–Organic Frameworks as a Way to Achieve High Adsorption Selectivity for CO₂/CH₄ Separation

The mesostructured Al-BDC metal–organic frameworks (MOFs) with an average pore size of 2.58 nm were prepared via a simplified washing and drying process and applied to the separation of CO₂/CH₄ mixtures. The adsorption equilibrium and thermodynamics of CH₄ and CO₂ were studied in the dynamic processes by the volumetric–chromatographic and inverse gas chromatographic (IGC) methods. The experiments represent that the Al-BDC MOF with large pore size has a much higher CO₂/CH₄ selectivity of ca. 24 at 303 K in the pressure range 0–1.0 MPa and therefore appears to be a good candidate for the separation of CH₄ from CO₂. The initial heats of adsorption of CH₄ and CO₂ on the mesostructured Al-BDC MOFs were determined to be 11.5 and 25.2 kJ mol^–1 by the IGC method, respectively, which are significantly reduced by ca. 25% compared with that on the microporous Al-BDC MOFs. The results indicate that the expanded pore size not only greatly increases the selectivity of CO₂ adsorption over CH₄ but also reduces the adsorption heat, revealing that it should be the desired method to obtain a satisfactory absorbent for CO₂/CH₄ separation

sj-docx-1-orm-10.1177_10944281241229784 - Supplemental material for Mixed-Keying or Desirability-Matching in the Construction of Forced-Choice Measures? An Empirical Investigation and Practical Recommendations

Supplemental material, sj-docx-1-orm-10.1177_10944281241229784 for Mixed-Keying or Desirability-Matching in the Construction of Forced-Choice Measures? An Empirical Investigation and Practical Recommendations by Mengtong Li, Bo Zhang, Lingyue Li, Tianjun Sun and Anna Brown in Organizational Research Methods</p