Pore Occupancy Changes Water/Ethanol Separation in a Metal–Organic Framework—Quantitative Map of Coadsorption by IR

El‐Roz, Mohamad; Bazin, Philippe; Čelič, Tadeja Birsa; Logar, Nataša Zabukovec; Thibault-Starzyk, Frédéric

doi:10.1021/acs.jpcc.5b07183

Cited by 17 publications

(17 citation statements)

References 32 publications

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“…These include the strength of the metal-ligand bonds or the basicity (pK a ) of the ligand, the oxidation and coordination state of the metal, the dimensionality of the framework and secondary building units (SBU), the type of connection node between the metal centres and the electron donor group, the catenation of the framework, and also weaker intermolecular interactions (H-bonds, π-π interactions, etc.) [10,21,[24][25][26][27]. To date, there have also been numerous attempts to develop new strategies to increase the water resistance of existing MOFs.…”

Section: Introductionmentioning

confidence: 99%

New Insight into Sorption Cycling Stability of Three Al-Based MOF Materials in Water Vapour

et al. 2022

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Three porous aluminium benzene-1,3,5-tricarboxylates MIL-96(Al), MIL-100(Al) and MIL-110(Al) materials were studied for their hydrothermal stability. The 40-cycles water vapour sorption experiments for the three samples were performed by varying the temperature between 40 and 140 °C at 75% relative humidity to simulate working conditions for materials used in water sorption-based low-T heat storage and reallocation applications. The materials were characterized by powder X-ray diffraction, N2 physisorption, and Nuclear Magnetic Resonance and Infrared spectroscopies before and after the cycling tests. The results showed that the structure of MIL-110(Al) lost its crystallinity and porosity under the tested conditions, while MIL-96(Al) and MIL-100(Al) exhibited excellent hydrothermal stability. The selection of structures, which comprise the same type of metal and ligand, enabled us to attribute the differences in stability primarily to the known variances in secondary building units and the shielding of potential water coordination sites due to the differences in pore accessibility for water molecules. Additionally, our results revealed that water adsorption and desorption at tested conditions (T, RH) is very slow for all three materials, being most pronounced for the MIL-100(Al) structure.

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Section: Introductionmentioning

confidence: 99%

New Insight into Sorption Cycling Stability of Three Al-Based MOF Materials in Water Vapour

et al. 2022

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“…Many theoretical studies have demonstrated that the MOF-based materials exhibit superior separation performance for gas mixtures and water/alcohol mixtures. [47][48][49][50] Based on the microporous MOF models designed without any termination in the pores, they found that interfacial affinity sieving is more crucial than pore-size sieving. It should be noted that the functionalization of microporous MOF-based MMMs with various active organic ligands and inorganic metal sites results in a new class of exciting materials for membrane applications.…”

Section: Introductionmentioning

confidence: 99%

Microporous 3D aluminum MOF doped into chitosan‐based mixed matrix membranes for ethanol/water separation

Vinu

Pal

Chen

et al. 2019

J Chinese Chemical Soc

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An aluminum metal–organic framework (Al‐MOF), [Al(OH)(BPDC)] (DUT‐5; BPDC = Biphenyl‐4,4′‐dicarboxylate), was synthesized using solvothermal reactions. The high surface area and micropores (approximately 1.2 nm) of DUT‐5 were characterized using N2 gas sorption measurements. The thermal stability of DUT‐5 and its phase purity were also investigated. The different amounts of DUT‐5 (0.1, 0.15, and 0.2 wt%) were successfully incorporated into the chitosan (CS) polymer to prepare a mixed matrix membrane (MMM) for the pervaporation of water/ethanol at 25°C. In particular, when 0.15 wt% of DUT‐5 was loaded, the DUT‐5@CS MMMs displayed excellent permeability and selectivity in ethanol/water separation. The results indicated that compared with pristine chitosan membranes, the flux of DUT‐5@CS membranes with 0.15 wt% loading significantly increased from 315 to 378 (g/m2 h−1) and the separation factor from 347 to 3,429. These promising results of the microporous Al‐MOF doped into chitosan MMMs reveal its good application potential for the bio‐ethanol separation processes.

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“…The nondestructive behavior of the FTIR technique allows its coupling with other analytic techniques. [19][20][21] However, up to date, the use of the in situ mode FTIR technique is mainly limited to the solid/gas phase reactions and/or for monitoring the adsorbed species on the photocatalytic surface. [22][23][24] Herein, we report a new in situ FTIR reactor for a realtime analysis of the gas products during a liquid photocatalytic reaction, under operating conditions.…”

Section: Introductionmentioning

confidence: 99%

“…In situ FTIR spectroscopy has been found to be very attractive for analyzing gas-phase products of solid–gas catalytic reactions. − In the transmission mode, it gives a quantitative information on the evolution of the gas-phase products in real time. The nondestructive behavior of the FTIR technique allows its coupling with other analytic techniques. − …”

Section: Introductionmentioning

confidence: 99%

In Situ FTIR Reactor for Monitoring Gas-Phase Products during a (Photo)catalytic Reaction in the Liquid Phase

et al. 2018

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Various catalytic and photocatalytic reactions in the liquid phase give rise to gas products. Therefore, the identification and quantification of these products are of high importance and even essential for some reactions. In this communication, a new in situ FTIR reactor is designed and used for analyzing the gas headspace of a (photo)catalytic reaction in solution. It allows the identification and quantification of the gas products of a liquid reaction under operating conditions and in real time. The new reactor has been tested in three representative photocatalytic reactions widely studied as model reactions in the liquid phase, i.e., i) decomposition of formic acid, ii) oxidation of Methylene Blue and iii) reduction of CO2. The validity of the results has been confirmed by analyzing the headspace at the end of the reaction using GC. The new reactor opens the possibility to follow on-line the (photo)catalyst activity. This is useful for ensuring the stability of the catalyst and studying the evolution of the selectivity during the reaction. The nondestructive behavior of the FTIR technique allows its coupling with other techniques for obtaining complementary results. The new reactor setup is easy to handle, to ship, and is very efficient which make it very suitable for performing fast and/or preliminary studies.

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Pore Occupancy Changes Water/Ethanol Separation in a Metal–Organic Framework—Quantitative Map of Coadsorption by IR

Cited by 17 publications

References 32 publications

New Insight into Sorption Cycling Stability of Three Al-Based MOF Materials in Water Vapour

New Insight into Sorption Cycling Stability of Three Al-Based MOF Materials in Water Vapour

Microporous 3D aluminum MOF doped into chitosan‐based mixed matrix membranes for ethanol/water separation

In Situ FTIR Reactor for Monitoring Gas-Phase Products during a (Photo)catalytic Reaction in the Liquid Phase

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