Magnesium-based systems for carbon dioxide capture, storage and recycling: from leaves to synthetic nanostructured materials

Abstract

Magnesium is used as leitmotif in this review in order to explore the systems involved in natural and artificial CO2 cycles.

New insights into UTSA-16

“…Infrared spectroscopy and volumetric data suggested that the main interaction between CO 2 and UTSA-16 was due to the direct interaction of CO 2 with K + ions. This result is in line with what was reported in the case of a study that describes the interaction of CO 2 with K + open metal sites in K-ZSM-5. 19 Moreover, CO 2 isosteric heat of adsorption evaluated in this work and the one obtained by Zukal et al 23 in the case of CO 2 interacting with the K-MCM-22 zeolite are very similar (39.7 vs. 41.1 kJ mol À1 at zero-coverage).…”

Cu2(pzdc)2L [L=dipyridyl-based ligands] porous coordination polymers: Hysteretic adsorption and diffusion kinetics of CO2 and CH4

“…Therefore, their removal from air or effective capture at the point source will continue to be an area of intense study. Likewise, separation of CO 2 is also critical in the processing of natural, shale or bio gas for usage in energy and transportation [4][5][6][7]. The presence of CO 2 not only reduces the energy content of natural gas, it induces severe corrosion of equipment and pipelines [8,9].…”

Increasing the stability of Mg2(dobpdc) metal–organic framework in air through solvent removal

“…With respect to applications, a strong obstacle is represented by their well-earned reputation as air and moisture sensitive materials. [6][7][8][9] The iconic and most famous MOF, MOF-5, decomposes after exposure to air for less than 10 min. 8,10 Several MOFs have been reported since then, 7,11,12 which have moisture stabilities going from fair (HKUST-1) 13 to exceptional (e.g.…”

“…Besides a few exceptions, 19 MOFs based on s-block metals are characterized by very poor air stability. 6 This is related to the higher ionic character of the metal-ligand bonds, with respect to those based on transition metal cations, 9 making them more reactive towards atmospheric water. Nevertheless, the high abundance on Earth of some of these elements makes them more affordable from an economic point of view, and allows widespread application of these MOFs, with respect to those based on transition metal elements.…”

“…Nevertheless, the high abundance on Earth of some of these elements makes them more affordable from an economic point of view, and allows widespread application of these MOFs, with respect to those based on transition metal elements. 6,9 Moreover, the large polarity of their metal-ligand bonds has been proven to be beneficial to the affinity of MOFs towards adsorbates such as CH 4 20 Among the MOFs proposed for CO 2 separation and storage, MOF-74-Mg or Mg 2 (dobdc) (H 4 dobdc = 2,5-dihydroxytereftalic acid; also known as IRMOF-74-I-Mg, Mg/DOBDC or CPO-27-Mg) has been reported to possess an exceptional CO 2 capacity of 8.0 mol kg À1 at 298 K and 1 bar. 22 It is also characterized by a very high CO 2 /N 2 selectivity.…”