Flexible (Breathing) Interpenetrated Metal−Organic Frameworks for CO₂ Separation Applications

Abstract

A breathing 2-fold interpenetrated microporous metal-organic framework was synthesized with a flexible tetrahedral organic linker and Zn(2) clusters that sorb CO(2) preferably over N(2) and H(2).

Gate effects in a hexagonal zinc-imidazolate-4-amide-5-imidate framework with flexible methoxy substituents and CO2 selectivity

“…The uptake of CO 2 by IFP-7 at 298 K and 1 bar is 40 cm 3 g À1 (7.85 wt%) which is higher than those of the previously reported flexible zinc MOFs with tetrahedral linkers. 25 A similar high uptake was recently found by Yaghi and co-workers for ZIF-69 and ZIF-82, which were synthesized by using imidazolates containing the functional groups Cl and CN. 26 At 195 K, a steep increase in the CO 2 uptake takes place in the low-pressure region (10-110 mmHg), and a small hysteresis is visible in all the desorption branches.…”

Microporous metal-organic framework with potential for carbon dioxide capture at ambient conditions

“…The regeneration energy cost to utilize these porous materials for CO 2 capture by the implementation of temperature swing adsorption, pressure swing adsorption (PSA) and vacuum swing adsorption is significantly lower than the abovementioned alkanolamine technology. More importantly, the rapid development over the past decade in this research field to target some porous MOFs for their extremely high uptake of CO 2 at high pressure 11,12 and to immobilize functional sites, such as open metal sites [13][14][15][16][17][18][19][20][21][22][23] , -NH 2 and -OH organic sites into the pore surfaces to enhance their interactions and thus enforce their efficient CO 2 separation selectivity have principally ensured the feasibility of porous MOFs for CO 2 capture [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] .…”

Doping of Alkali, Alkaline-Earth, and Transition Metals in Covalent-Organic Frameworks for Enhancing CO2 Capture by First-Principles Calculations and Molecular Simulations

“…3 Bae et al synthesized a mixed-ligand MOF, Zn 2 (NDC) 2 (DPNI) [NDC ϭ 2,6-naphthalenedicarboxylate, DPNI ϭ N,N=-di-(4-pyridyl)-1,4,5,8-naphthalene tetracarboxydiimide], and found that this material shows a selectivity of ϳ30 for CO 2 over CH 4 by using the ideal adsorbed solution theory (IAST). 6 Demessence et al synthesized an air-and water-stable MOF, H 3 [(Cu 4 Cl) 3 -(BTTri) 8 ] (H 3 BTTri ϭ1,3,5-tris(1H-1,2,3-triazol-5-yl)benzene). 13 Their results proved that the CO 2 uptakes of this material reach 142.56 mg/g at 298 K and 1 bar, while exhibiting significantly higher uptakes of CO 2 at even lower pressure after functionalized by ethylenediamine.…”