A stable metal–organic framework with suitable pore sizes and rich uncoordinated nitrogen atoms on the internal surface of micropores for highly efficient CO₂ capture

Abstract

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Two stable 3D porous metal–organic frameworks with high performance for gas adsorption and separation

“…S6, †the low-pressure uptake for H 2 is completely reversible and the adsorption amount is 1.81 wt% (203 cm 3 g À1 ) and 1.34 wt% (150 cm 3 g À1 ) at 77 and 87 K under 1 bar respectively, which are quite comparable with highly porous MOFs under the same conditions. 43,44 Furthermore, the maximum adsorption amount of O 2 is 529 cm 3 g À1 at 77 K (Fig. S7 †), which is comparable to those of highly porous MOFs.…”

Synthesis, structure and properties of coordination polymers formed from bridging 4-hydroxybenzoic acid anions

“…Examples of porous materials showing superior CO 2 uptake over CH 4 are reasonably common. 30 In many of these cases, workers have attributed the preferred CO 2 over CH 4 uptake to size exclusion mechanisms, 31 greater polarizability of CO 2 compared to CH 4 and preferred binding of CO 2 to pore surfaces 32,33 in addition to superior CO 2 adsorption kinetics. 34…”

Metal‐Organic Frameworks for Carbon Dioxide Capture and Methane Storage

“…Seth et al also reported a triazole‐containing cadmium MOF with accessible uncoordinated N atoms, exhibiting a similar CO 2 uptake (4.42 mmol g ‐1 ) at 1 bar and 273 K . Bao et al synthesized an air‐stable tetrazolate‐containing NENU‐520 with uncoordinated N atoms and suitable pore size (≈0.36 nm) for CO 2 adsorption . NENU‐520 exhibits a moderate CO 2 uptake (2.7 mmol g ‐1 ) at 1 bar and 298 K because of the limited surface area (387 m 2 g ‐1 BET), but extremely high IAST CO 2 /N 2 selectivity of up to 600 at 298 K, for a simulated gas mixture of 0.15 bar CO 2 and 0.85 bar N 2 .…”