Formation of a Polar Flow Channel with Embedded Gas Recognition Pockets in a Yttrium-Based MOF for Enhanced C₂H₂/C₂H₄ and CO₂ Selective Adsorptions

Abstract

A polar flow channel with embedded gas recognition pockets was made in a 10-connected hexanuclear yttrium-based metal−organic frameworks (MOF) NTUniv-57 (NTUniv = Nantong University) by lowering the symmetry of the ligand, which showed high chemical stability and obviously enhanced gas adsorption selectivities.

Porous Triple-Layered Supramolecular Heptazine-Based MOF with High Concentration of Binding Sites for Selective Separation of Methane

“…Traditional porous solid materials, such as zeolite and activated carbon, have been broadly utilized in the realm of PSA over the past few decades. However, they still have many shortcomings, such as difficulty in designing and regulation, poor selectivity, and low uptake. , The metal–organic frameworks (MOFs), a class of flourishing porous crystalline materials, have attracted large interest as a promising alternative for gas adsorptive separation, because of their more ordered structure, fine-tuning pore environment, − high specific surface areas, and pore volume. − MOFs are composed of metal ions/clusters and organic linkers − therefore, the structure and chemical composition of MOFs can be easily regulated to boost their adsorption selectivity and ability. − Decorating polar functional groups like −NH 2 , uncovered N atoms, −SO 3 H, and −NO 2 on organic ligands is a preferable approach for reinforcing selective gas capture. ,− Additionally, the creation of high- density unsaturated and accessible metal sites is an effective means to achieve efficient gas selectivity. − Recently, rare earth-based MOFs with polynuclear metal-carboxylate clusters as active sites have been widely used in the field of adsorption and separation. − This is primarily due to the extremely diverse coordination environment of rare earth ions. More importantly, rare ions commonly have a high concentration of coordinated solvents, which can be eliminated during the activation process to create open metal sites (OMSs).…”

Flow Channel with Recognition Corners in a Stable La-MOF for One-Step Ethylene Production

“…This strategy was regarded as the design guidance for the next-generation sieving material, which could provide not only high gas separation ability but also fast adsorption–desorption kinetics. We also used this novel and rarely explored strategy to boost the C 2 H 2 /C 2 H 4 separation ability . Until now, such a strategy has not been used for single-step purification of C 2 H 4 from C 2 H 2 /C 2 H 4 /C 2 H 6 mixtures.…”

“…We also used this novel and rarely explored strategy to boost the C 2 H 2 /C 2 H 4 separation ability. 15 Until now, such a strategy has not been used for single-step purification of C 2 H 4 from C 2 H 2 /C 2 H 4 /C 2 H 6 mixtures. Combining the strategy of the flow channel and the above examples, we put forward a general structural feature for C 2 H 4 purification.…”