(678f) High Performance Gas Adsorption and Separation of Light Hydrocarbon in a Microporous Metal Organic Framework

The adsorption and separation of CH₄, C₂H₆, C₃H₈ and C₄H₁₀ on the Zn(bdc)(ted)_0.5 were studied. The samples were characterized by N₂ adsorption, X-ray diffraction (XRD), and Fourier Transform Infrared spectroscopy (FTIR). The adsorption isotherms of light hydrocarbon gases on the Zn(bdc)(ted)_0.5 were separately measured by volumetric method, and the C₂H₆/CH₄, C₃H₈/CH₄ and C₄H₁₀/CH₄ adsorption selectivities of the samples were calculated based on ideal adsorbed solution theory (IAST). Results showed that the isotherms of light hydrocarbon gases on the adsorbent were well fitted by Langmuir-Frendlich equation. Zn(bdc)(ted)_0.5 could take up a amount of C₂H₆ (4.9 mmol/g) C₃H₈ (6.6 mmol/g), and C₄H₁₀ (6.9 mmol/g), which were much higher than the amount of CH₄ (0.4 mmol/g) at 298 K and 1 atm. The C₄H₁₀/CH₄ selectivity was the highest and was in the range of 65–150. The C₃H₈/CH₄ selectivity is lower and the values were in the range of 8–16. The C₂H₆/CH₄ selectivity was the lowest and the values was in the range of 1.4–2.