Novel and Versatile Cobalt Azobenzene‐Based Metal‐Organic Framework as Hydrogen Adsorbent

Abstract

A novel URJC-3 material based on cobalt and 5,5'-(diazene-1,2diyl)diisophthalate ligand, containing Lewis acid and basic sites, has been synthesized under solvothermal conditions. Compound URJC-3, with polyhedral morphology, crystallizes in the tetragonal and P4 3 2 1 2 space group, exhibiting a three-dimensional structure with small channels along a and b axes. This material was fully characterized, and its hydrogen adsorption properties were estimated for a wide range of temperatures (77-298 K) and pressures (1-170 bar). The hydrogen storage capacity of URJC-3 is quite high in relation to its moderate surface area, which is probably due to the confinement effect of hydrogen molecules inside its reduced pores of 6 Å, which is close the ionic radii of hydrogen molecules. The storage capacity of this material is not only higher than that of active carbon and purified single-walled carbon nanotubes, but also surpasses the gravimetric hydrogen uptake of most MOF materials.

Guest-Induced Structural Deformation in Cu-Based Metal-Organic Framework Upon Hydrocarbon Adsorption

“…Metal-Organic frameworks (MOFs), a sub-class of porous coordination polymers (PCPs), are hybrid organic-inorganic porous materials well known for their promising structural properties such as high surface area, pore volume, and relatively high thermal and chemical stability. Accordingly, MOFs are being currently explored in a wide range of applications such as gas sequestration and separation [11,12], energy storage [13], drug or biomolecule release [14,15], and heterogeneous catalysis [16].…”

Monte carlo study of hydrogen adsorption by MOF-5 doped with cobalt at ambient temperature and pressure

“…However, Metal-Organic Frameworks (MOFs) structures have received very important attention over the past two decades for applications in renewable energy and environmental science [3]. Indeed, the large number of combinations of organic linkers and metal connectors that can be used in principle makes it possible to design materials for a wide variety of potential applications [4][5][6]. These MOFs have the promise that by modifying building blocks, organic ligands or metallic nodes, i.e.…”

“…The substitution of the Zinc atoms of MOF-74 by Cobalt atoms also offered good performances in gas adsorption, Botas et al, [38] Show that the isosteric heat increased with the concentration of cobalt. Montes et al [4] shows that the cobalt-based URJC-3 molecule has hydrogen storage performance not only better than activated carbon and purified single-walled carbon nanotubes but also exceeds absorption gravimetric of hydrogen reached by most MOFs, despite their moderate surfaces due to small pores [4].…”

Two Isostructural URJC-4 Materials: From Hydrogen Physisorption to Heterogeneous Reductive Amination through Hydrogen Molecule Activation at Low Pressure

“…Metal–organic frameworks (MOFs) materials are a new class of porous and crystalline polymers built up from metallic clusters connected through organic linkers through coordination chemistry . The multiple combinations of metal sites and organic linkers allow for the design of MOFs with diverse structures, rich functionalities, and tunable pore systems, achieving excellent properties for a wide range of applications, such as drug or biomolecule release, gas separation and purification, heterogeneous catalysis, and gas storage . Concerning the last one, MOF materials with high surface areas can store hydrogen (H 2 ) through a physisorption mechanism, which presents many advantages in comparison with chemisorption, such as total reversibility, fast adsorption–desorption kinetics, and minor heat-transfer requirements in desorption .…”

“…1 The multiple combinations of metal sites and organic linkers allow for the design of MOFs with diverse structures, rich functionalities, and tunable pore systems, achieving excellent properties for a wide range of applications, such as drug or biomolecule release, 2 gas separation and purification, 3 heterogeneous catalysis, 4 and gas storage. 5 Concerning the last one, MOF materials with high surface areas can store hydrogen (H 2 ) through a physisorption mechanism, which presents many advantages in comparison with chemisorption, such as total reversibility, fast adsorption− desorption kinetics, and minor heat-transfer requirements in desorption. 6 Additionally, MOF materials with enhanced H 2 physisorption properties might also be potential catalysts in hydrogenation reactions.…”