Ultramicroporous Building Units as a Path to Bi‐microporous Metal–Organic Frameworks with High Acetylene Storage and Separation Performance

Abstract

As trategy called ultramicroporous building unit (UBU) is introduced. It allows the creation of hierarchical biporous features that work in tandem to enhance gas uptake capacity and separation. Smaller pores from UBUs promote selectivity,w hile larger inter-UBUp acking pores increase uptake capacity.T he effectiveness of this UBUs trategy is shown with ac obalt MOF (denoted SNNU-45) in which octahedral cages with 4.5 pore sizeserve as UBUs.The C 2 H 2 uptake capacity at 1atm reaches 193.0 cm 3 g À1 (8.6 mmol g À1 ) at 273 Kand 134.0 cm 3 g À1 (6.0 mmol g À1 )at298 K. Suchhigh uptake capacity is accompanied by ahigh C 2 H 2 /CO 2 selectivity of up to 8.5 at 298 K. Dynamic breakthrough studies at room temperature and 1atm show aC 2 H 2 /CO 2 breakthrough time up to 79 min g À1 ,among top-performing MOFs.Grand canonical Monte Carlo simulations agree that ultrahigh C 2 H 2 /CO 2 selectivity is mainly from UBUultramicropores,while packing pores promote C 2 H 2 uptake capacity.

Ultrathin Ni-MOF Nanobelts-Derived Composite for High Sensitive Detection of Nitrite

“…Because the micro/nanoscale structure has a great potential to overcome the disadvantages of low specific surface area (SSAs) and poor contacts of active materials with electrolyte/pollutants compared to conventional bulks or aggregate materials. Therefore, it is considered as a promising electrode material Bosch et al, 2017;Shi et al, 2017;Li Y.-P. et al, 2019;Xiao et al, 2020). In recent years, since it has been noted that various processes such as thermodynamics and kinetics of various reactions occurring at the interface are significantly affected by the surface energy of micro/nanocrystals, MOF-derived materials have become a research hotspot (Yang et al, 2008;Larsson et al, 2009;Du et al, 2014Du et al, , 2017Bosch et al, 2017;Shi et al, 2017;Liu et al, 2019;Li Y.-P. et al, 2019;Xiao et al, 2020).…”

“…(2) They have high porosity and specific surface areas to carry metal nanoparticles; (3) Understanding catalysis requires defining the MOF structure distinctly and ensuring that the pore structure is easily tailored in order to assure that the surrounding environment of metal nanoparticles is easily identified (Mukoyoshi et al, 2015;Tang et al, 2018;Chen et al, 2019;Li Y.-P. et al, 2019).…”

Mixed Metal–Organic Framework with Multiple Binding Sites for Efficient C2H2/CO2Separation

“…The C 2 H 2 and CO 2 gas adsorption isotherms of FeNi‐M′MOF were measured at both 273 and 298 K. As shown in Figure b, the volumetric C 2 H 2 uptake capacity of FeNi‐M′MOF is 133 cm 3 cm −3 (4.29 mmol g −1 ) at 1 bar and 298 K, which is higher than those of many other MOFs, such as DICRO‐4‐Ni‐i (52 cm 3 cm −3 ), ZJU‐60 a (96 cm 3 cm −3 ), Cu[Ni(pdt) 2 ] (108 cm 3 cm −3 ), SNNU‐45 (113 cm 3 cm −3 ), TIFSIX‐2‐Cu‐i (116 cm 3 cm −3 ), PCP‐33 (128 cm 3 cm −3 ), and comparable to those of UTSA‐74 (144 cm 3 cm −3 ), FJU‐90 a (146 cm 3 cm −3 ), and Zn‐MOF‐74 (150 cm 3 cm −3 ) . The CO 2 uptake of FeNi‐M′MOF is 84 cm 3 cm −3 (2.72 mmol g −1 ) at 1 bar and 298 K. At 1 bar and 273 K, C 2 H 2 and CO 2 uptakes of FeNi‐M′MOF are up to 145 and 102 cm 3 cm −3 respectively, as shown in Figure S8.…”

CO2 controls the oriented growth of metal-organic framework with highly accessible active sites

“…etal-organic frameworks (MOFs) are a new type of crystalline porous materials that are self-assembled by the coordination of metal cations/clusters with organic linkers 1 , which have broad applications in gas storage and separation [2][3][4] , catalysis 5 , sensor 6 , drug delivery 7 , etc. Particularly, MOFs have exhibited promising catalytic potentials towards many kinds of reactions owing to their designable metal-oxo clusters bridging organic linkers, modifiable structure, and intrinsic porosities 8 .…”