A porous Cd(II) metal-organic framework with high adsorption selectivity for CO2 over CH4

Metal-organic frameworks (MOFs) have attracted a lot of attention in recent decades. We applied a semirigid four-carboxylic acid linker to assemble with Cd(II) ions to generate a novel microporous Cd(II) MOF material. Single crystal X-ray diffraction study reveals the different two dimension (2D) layers can be further packed together with an AB fashion by hydrogen bonds (O4-H4 center dot center dot center dot O7=1.863 angstrom) to construct a three dimension (3D) supermolecular architecture. The resulting sample can be synthesized under solvothermal reactions successfully, which exhibits high selectivity adsorption of CO2 over CH4 at room temperature. In addition, the obtained sample was characterized by thermal gravimetric analyses (TGA), Fourier-transform infrared spectra (FT-IR), elemental analysis (CHN) and powder X-ray diffraction (PXRD). (C) 2017 Elsevier B.V. All rights reserved.