An experimental and simulation study of binary adsorption in metal-organic frameworks

作者：Yang Ying; Sitprasert Chatcharin; Rufford Thomas E; Ge Lei; Shukla Pradeep; Wang Shaobin; Rudolph Victor; Zhu Zhonghua^*

来源：Separation and Purification Technology, 2015, 146: 136-142.

DOI：10.1016/j.seppur.2015.03.041

• MOFs
• Binary adsorption
• Gas selectivity
• Ideal adsorbed solution theory

Large surface area, high gas adsorption capacity and convenient synthesis methods make microporous metal-organic frameworks (MOFs) a promising adsorbent for gas separation of CO2/N-2 and CO2/CH4. This study examines the selective adsorption of CO2 on MOFs through the experimental measurement of equilibrium adsorption capacities from pure fluids (CO2, CH4 and N-2) and mixtures of CO2/N-2 and CO2/CH4. The derived adsorption selectivity from binary adsorption measurements is higher than the ideal selectivity. Comparing with direct binary adsorption experiments, the Ideal Adsorbed Solution Theory (IAST) model using best-fit parameters for Langmuir isotherms of each pure fluid provides satisfactory predictions for the binary mixtures of CO2/N-2 and CO2/CH4. This combined experimental and modeling approach can provide criteria to screen metal-organic frameworks for the separation of gas mixtures at industrially relevant compositions, temperatures and pressures.

• 出版日期2015-5-26