Improved CO2 capture from flue gas by basic sites, charge gradients, and missing linker defects on nickel face cubic centered MOFs
Articolo
Data di Pubblicazione:
2014
Citazione:
Improved CO2 capture from flue gas by basic sites, charge gradients, and missing linker defects on nickel face cubic centered MOFs / E. López-Maya, C. Montoro, V. Colombo, E. Barea, J.A.R. Navarro. - In: ADVANCED FUNCTIONAL MATERIALS. - ISSN 1616-301X. - 24:39(2014), pp. 6130-6135.
Abstract:
The adsorptive properties of the isoreticular series [Ni 8 (OH) 4 (H2 O) 2 (BDP-X) 6] (H2 BDP-X = 1,4-bis(pyrazol-4-yl)benzene-4-X with X = H (1), OH (2), NH2 (3)) can be enhanced by postsynthetic treatment with an excess of KOH in ethanol. In the case of X = H, NH2, this treatment leads to partial removal of the organic linkers, deprotonation of coordinated water molecules and introduction of extraframework cations, giving rise to materials of K[Ni8 (OH) 5 (EtO)-(H2 O) 2 (BDP-X) 5.5 ] (1@KOH, 3@KOH) formulation, in which the original framework topology is maintained. By contrast, the same treatment with KOH in the [Ni8 (OH) 4 (H2 O) 2 (BDP-OH) 6] (2) system, enclosing the more acidic phenol residues, leads to a new material containing a larger fraction of missing linker defects and extra-framework cations as well as phenolate residues, giving rise to the material K3 [Ni8 (OH) 3 (EtO)(H2 O) 6 (BDP-O) 5 ] (2@KOH), which also conserves the original face cubic centered (fcu) topology. It is noteworthy that the introduction of missing linker defects leads to a higher accessible pore volume with a concomitant increased adsorption capacity. Moreover, the creation of coordinatively unsaturated metal centers, charge gradients, and phenolate nucleophilic sites in 2@KOH gives rise to a boosting of CO2 capture features with increased adsorption heat and adsorption capacity, as proven by the measurement of pulse gas chromatography and breakthrough curve measurements of simulated flue gas.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
metal-organic frameworks; carbon capture; gas separation; zeomimetic; green house gases
Elenco autori:
E. López-Maya, C. Montoro, V. Colombo, E. Barea, J.A.R. Navarro
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