Hierarchical Porous Metal-organic Framework Research Articles

Hierarchically porous metal–organic frameworks with single-crystal structures and their enhanced catalytic properties

Stable hierarchically porous metal–organic frameworks (HP-MOFs) have been successfully synthesized under hydrothermal conditions using a template strategy.

Facile synthesis of hierarchical porous metal-organic frameworks with enhanced catalytic activity

The development of a general method for the facile synthesis of hierarchical porous metal–organic frameworks (H-MOFs) with tunable porosities is important because of their widespread applications. Herein, through the ingenious use of different neutral organic amines as templates, we report the development of a green and versatile method to synthesize three H-MOFs (Cu-BTC, ZIF-8, and ZIF-90) with tunable morphologies and porosities. The selected neutral amine template molecules deprotonated organic ligands and facilitated the formation of H-MOFs while guiding the formation of meso- and macropores. These high quality as-synthesized H-MOFs possessed micro-, meso-, and macropore hierarchical structures and high thermal stability after the amine templates were removed by simple washing and drying. The as-prepared Cu-BTC H-MOFs exhibited more than 2 times higher activity than conventional microporous Cu-BTC in catalyzing Henry reaction. Our facile strategy establishes a green and general route to synthesize a large variety of H-MOFs for various applications, particularly when large molecules or biomolecules are involved.

Template synthesis of hierarchical porous metal–organic frameworks with tunable porosity

A versatile method to synthesize various stable hierarchical porous metal–organic frameworks, such as Cu–BTC and ZIF–8, by using an organic amine as the template.

A Modulator‐Induced Defect‐Formation Strategy to Hierarchically Porous Metal–Organic Frameworks with High Stability

AbstractThe pore size enlargement and structural stability have been recognized as two crucial targets, which are rarely achieved together, in the development of metal–organic frameworks (MOFs). Herein, we have developed a versatile modulator‐induced defect‐formation strategy, in the presence of monocarboxylic acid as a modulator and an insufficient amount of organic ligand, successfully realizing the controllable synthesis of hierarchically porous MOFs (HP‐MOFs) with high stability and tailorable pore characters. Remarkably, the integration of high stability and large mesoporous property enables these HP‐MOFs to be important porous platforms for applications involving large molecules, especially in catalysis.

A Modulator-Induced Defect-Formation Strategy to Hierarchically Porous Metal-Organic Frameworks with High Stability.

The pore size enlargement and structural stability have been recognized as two crucial targets, which are rarely achieved together, in the development of metal-organic frameworks (MOFs). Herein, we have developed a versatile modulator-induced defect-formation strategy, in the presence of monocarboxylic acid as a modulator and an insufficient amount of organic ligand, successfully realizing the controllable synthesis of hierarchically porous MOFs (HP-MOFs) with high stability and tailorable pore characters. Remarkably, the integration of high stability and large mesoporous property enables these HP-MOFs to be important porous platforms for applications involving large molecules, especially in catalysis.

Assembly of a Metal-Organic Framework into 3 D Hierarchical Porous Monoliths Using a Pickering High Internal Phase Emulsion Template.

3D Hierarchical porous metal-organic framework (MOF) monoliths are prepared by using Pickering high internal phase emulsion (HIPE) template. Pickering HIPEs were stabilized solely by UiO-66 MOF particles with internal phase up to 90 % of the volume. The effects of internal phase type and volume, as well as MOF particle concentration on the stability of resulting Pickering HIPEs were investigated. Furthermore, by adding small amount of polyvinyl alcohol (PVA) as binder or polymerization in the continuous aqueous phase, followed by freeze-drying, two types of MOF-based 3D hierarchical porous monoliths with ultralow density (as low as 12 mg cm(-3) ) were successfully prepared. This Pickering HIPE template approach provides a facile and practical way for assembling of MOFs into complex structures.

3D Reconstruction and Porosity Study of a Hierarchical Porous Monolithic Metal Organic Framework by FIB-SEM Nanotomography

3D Reconstruction and Porosity Study of a Hierarchical Porous Monolithic Metal Organic Framework by FIB-SEM Nanotomography

Enhanced catalytic activity of a hierarchical porous metal–organic framework CuBTC

A hierarchical porous metal–organic framework CuBTC with mesopores of 3.9 nm pore size has been facilely obtained as Lewis acid catalyst.

Ionic liquid-assisted growth of Cu3(BTC)2 nanocrystals on graphene oxide sheets: Towards both high capacity and high rate for CO2 adsorption

Hierarchical porous metal organic framework (MOF) composites are highly demanded because they can keep the high activity and good transport property simultaneously. A novel method of ionic liquid-assisted growth of Cu3(BTC)2 on graphene oxide (GO) sheets was proposed and applied to improve both CO2 adsorption capacity and adsorption rate. Three ionic liquids (ILs) of triethylene tetramine acetate (TETA-Ac), triethylene tetramine tetrafluoroborate (TETA-BF4) and 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) were used to investigate the effects of cations and anions of ILs on the structure of GO-IL/MOF composite. With amine or imidazole cations adsorbed at the surface of GO and the contrary anions closely attached, GO-ILs can provide a lot of active sites for the absorption of Cu2+ cations through the coordination. Just like a bridge, ILs assisted the initial growth of the first seed layer of Cu3(BTC)2 on the surface of GO. Among various GO-IL/MOF composites, GO-TAc/MOF-60 sample showed a superimposed structure, which lead to more accessible adsorption activity sites and shorten the transfer distance. Also, the GO sheets in GO-IL/MOF provide channels for faster transfer. It showed a high CO2 adsorption capability of 5.62mmol/g at 25°C and 100kPa, and a high CO2 kinetic separation performance as well. More importantly, the composite presented a quite good cyclic adsorption/desorption stability. The relations between the specific structures of the composites and the CO2 adsorption behaviors were tentatively demonstrated to reveal a convenient way for designing and fabricating hierarchical MOF composites.