| Abstrakt: |
Adsorption equilibrium, thermodynamics, and kinetics of CH4, N2, and CO2were investigated by volumetric-chromatographic and inverse gas chromatographic (IGC) methods on the Al-BDC MOF. The binary adsorption data from the volumetric-chromatographic experiments represents that the Al-BDC MOF has a high CO2/CH4selectivityca.11 and a CH4/N2selectivityca.4.3 at 303 K, and appears to be a good candidate for the CH4separation. The initial adsorption heats of CH4, N2, and CO2on the Al-BDC MOF were determined to be 15.3, 11.5, and 32.2 kJmol−1by IGC method, respectively. Moreover, the micropore diffusivities of N2, CH4and CO2in the Al-BDC MOF at 303 K were also estimated to be 1.58 × 10−7cm2/s, 7.04 × 10−8cm2/s, and 3.95 × 10−9cm2/s, respectively. The results indicate that micropores play a crucial role in the adsorptive separation of the CH4/N2and CH4/CO2mixtures, and the IGC method is a validity manner to estimate the thermodynamic and kinetic parameters of MOF adsorbents. [ABSTRACT FROM PUBLISHER] |
