Role of the chemical structure of metal–organic framework compounds in the adsorption of hydrogen

Abstract

The effect of the chemical structure of metal-organic framework compounds (MOF) (the presence of coordination-unsaturated metal ions, the nature of the metal ions, the presence of electron donor and electron acceptor groups in the ligands) on the ability of such compounds to sorb hydrogen is examined. It is shown that the macroscopic parameters (the surface area and pore size) make a major contribution to the adsorption of hydrogen while the chemical structure of the MOF plays a subsidiary role by determining the structural characteristics of the adsorbent.Key words: metal-organic frameworks, porous coordination polymers, hydrogen sorption, coordination-unsaturated ions, effect of the nature of metal ions, effect of functional groups.

The current status of hydrogen storage in metal–organic frameworks—updated

“…20 Since then, MOFs have attracted worldwide attention in the area of hydrogen energy, particularly for hydrogen storage. 1,[21][22][23][24][25][26][27][28][29] The over 1300 hits when searching ''metal-organic framework'' and ''hydrogen storage'' on ISI Web of Knowledge and the significant contributions to this number in the last two years shows that the area is receiving a concentrated interest from the scientific community to instigate MOFs as the means to deliver hydrogen to the world (Fig. 1).…”

A Microporous Copper Metal–Organic Framework with High H2 and CO2 Adsorption Capacity at Ambient Pressure

“…cam.ac.uk/data_request/cif. In-soc-MOF [38] 2.60 PCN-12 [17,33,34] 3.05 PCN-12-Si [12] 2.60 UTSA-20 [35] 2.92 MOF-505 [17,33] 2.59 SNU-5 [33,34,36] 2.84 PCN-11 [8,16,33] 2.55 NOTT-103 [9] 2.63 CPO-27-Mg [37] 2.50 HKUST-1 [17,33] 2.54-2.70 MOF-5 [39] 1.32…”

Influence of morphology and defects in crystals of porous coordination polymers on the sorption characteristics

“…The contribution of micropores in the porous coordination polymers con sidered in this work is comparable with the micropore contribution to the sorption capacity with respect to hydrogen of some classes of carbon sorbents. At the same time, the influence of the surface area is higher than the micropore effect for the porous coordination polymers in which the pore walls are formed by aro matic groups and in which hydrogen can be bound near metal ions [19,[23][24][25]. This can be due to a higher polarizing effect of aromatic groups on hydro gen molecules and, as a consequence, to a denser monolayer filling.…”