Improving CO₂/CH₄ and CO₂/N₂ adsorptive selectivity of Cu-BTC and MOF-derived nanoporous carbon by modification with nitrogen-containing groups

چکیده مقاله

For the first time in this study compared the adsorption capacity and selectivity of carbon dioxide (CO₂), methane (CH₄), and nitrogen (N₂) on amine-modified copper(II) benzene-1,3,5-tricarboxylate (Cu-BTC) and metal organic framework-derived nanoporous carbon (MOF/NPC) by employing a volumetric measurement. The MOF/NPC is synthesized via direct carbonization of the Cu-BTC as a template without any carbon precursor at 900°C under N₂ atmosphere and shows easy synthesis, large surface area, high excellent thermal and chemical stability as well as high resistance to moisture. All the prepared materials are characterized by nitrogen adsorption/desorption, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and thermogravimetric analysis (TGA). The porous supports could be effectively improved for CO₂ adsorption with amine groups due to their high affinity toward CO₂. CO₂ adsorption capacity for MOF/NPC is 7.50 mmol g⁻¹ when MOF/NPC is modified with the amine, CO₂ adsorption capacity is increased (from 7.50 to 11.40 mmol g⁻¹) at 298 K and 10 bar. © 2019 American Institute of Chemical Engineers