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

Abstract

For the first time in this study compared the adsorption capacity and selectivity of carbon dioxide (CO 2), methane (CH 4), and nitrogen (N 2) 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 N 2 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 CO 2 adsorption with amine groups due to their high affinity toward CO 2. CO 2 adsorption capacity for MOF/NPC is 7.50 mmol g −1 when MOF/NPC is modified with the amine, CO 2 adsorption capacity is increased (from 7.50 to 11.40 mmol g −1) at 298 K and 10 bar.

Zinc(ii) and cadmium(ii) amorphous metal–organic frameworks (aMOFs): study of activation process and high-pressure adsorption of greenhouse gases

“…This simple interaction has so far led to a number of nanoporous polymers in which nitrogen-rich functions are incorporated, such as triazine, 65,66 tetrazole, 67 imidazole, 68,69 imide 70 and amines. 42,71 Increased CO 2 adsorption capacity in UPJS-13 (FD) and UPJS-14 (FD) can be explained by an interaction between CO 2 molecules and adsorption sites represented by a lone pair on the azo functional groups located in the molecular structure of the MTA linker. In the case of azo group, the interaction with CO 2 was also conrmed by computational studies, in which the relative binding affinity of CO 2 to the -N]Ngroup using trans-azobenzene as a model system were performed.…”

Integrated material and process evaluation of metal–organic frameworks database for energy-efficient SF6/N2 separation

“…Figure 3 For practical purposes, the performance evaluation metrics used for the screening should, in principle, correlate with the performance of MOFs in the actual PSA and VSA processes. For binary gas separation cases, the selectivity and working capacity have been used frequently in the literature [37,38,39], but recent studies have shown that these commonly used metrics do not necessarily reflect the performance of MOFs at the process-level [40,41,42,32]. We adopted an ideal VSA/PSA process simulation method to quickly evaluate the performance of MOFs at the process-level.…”

Low-Hydrophilic HKUST−1/Polymer Extrudates for the PSA Separation of CO2/CH4

“…Recently, metal-organic frameworks (MOFs) have been gaining attention for their potential application in gas separation owing to their inherent properties, such as high specific surface area, large porosity, and tunable pore size [8,9]. In the literature, MOFs have been extensively studied for their capability to separate CO 2 from CH 4 [10][11][12]. Amongst the materials investigated, HKUST−1 has been identified as a good candidate for CO 2 /CH 4 separation because of its good CO 2 /CH 4 selectivity [13,14].…”