Pore with Gate: Enhancement of the Isosteric Heat of Adsorption of Dihydrogen via Postsynthetic Cation Exchange in Metal−Organic Frameworks

2011 ◽  
Vol 50 (19) ◽  
pp. 9374-9384 ◽  
Author(s):  
Sihai Yang ◽  
Gregory S. B. Martin ◽  
Jeremy J. Titman ◽  
Alexander J. Blake ◽  
David R. Allan ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Metal Organic Frameworks ◽  
Isosteric Heat ◽  
Heat Of Adsorption ◽  
Isosteric Heat Of Adsorption ◽  
Metal Organic

Microporous rod metal–organic frameworks with diverse Zn/Cd–triazolate ribbons as secondary building units for CO2 uptake and selective adsorption of hydrocarbons

2017 ◽  
Vol 46 (3) ◽  
pp. 836-844 ◽  
Author(s):  
Jian-Wei Zhang ◽  
Man-Cheng Hu ◽  
Shu-Ni Li ◽  
Yu-Cheng Jiang ◽  
Quan-Guo Zhai
Keyword(s):  
Selective Adsorption ◽  
Metal Organic Frameworks ◽  
Isosteric Heat ◽  
Heat Of Adsorption ◽  
Co2 Uptake ◽  
Isosteric Heat Of Adsorption ◽  
Secondary Building Units ◽  
Metal Organic

Three rod MOFs exhibiting remarkable CO2 uptake and high CO2 and C2-hydrocarbons over CH4 selectivity, as well as high isosteric heat of adsorption for C2H2.

Tuning the functional sites in metal–organic frameworks to modulate CO2 heats of adsorption

CrystEngComm ◽  
2015 ◽  
Vol 17 (4) ◽  
pp. 706-718 ◽  
Author(s):  
Anita Das ◽  
Deanna M. D'Alessandro
Keyword(s):  
Metal Organic Frameworks ◽  
Isosteric Heat ◽  
Performance Criterion ◽  
Heat Of Adsorption ◽  
Adsorption Properties ◽  
Isosteric Heat Of Adsorption ◽  
Functional Sites ◽  
Heats Of Adsorption ◽  
Metal Organic ◽  
Insight Into

Tuning the functional sites in metal–organic frameworks provides one strategy to vary the CO2 adsorption properties – this highlight article provides insight into modulation of another key performance criterion, namely the isosteric heat of adsorption, and its influence on CO2 capture.

Green Synthesis and Enhanced CO2 Capture Performance of Perfluorinated Cerium-Based Metal-Organic Frameworks with UiO-66 and MIL-140 Topology

2018 ◽  
Author(s):  
Roberto D’Amato ◽  
Anna Donnadio ◽  
Mariolino Carta ◽  
Claudio Sangregorio ◽  
Riccardo Vivani ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Metal Organic Frameworks ◽  
Isosteric Heat ◽  
Experimental Conditions ◽  
Cerium Ammonium Nitrate ◽  
Ideal Adsorbed Solution Theory ◽  
Metal Organic ◽  
Adsorbed Solution ◽  
Better Than ◽  
The Ideal

Reaction of cerium ammonium nitrate and tetrafluoroterephthalic acid in water afforded two new metal-organic frameworks with UiO-66 [F4_UiO-66(Ce)] and MIL-140 [F4_MIL-140A(Ce)] topologies. The two compounds can be obtained in the same experimental conditions, just by varying the amount of acetic acid used as crystallization modulator in the synthesis. Both F4_UiO-66(Ce) and F4_MIL-140A(Ce) feature pores with size < 8 Å, which classifies them as ultramicroporous. Combination of X-ray photoelectron spectroscopy and magnetic susceptibility measurements revealed that both compounds contain a small amount of Ce(III), which is preferentially accumulated near the surface of the crystallites. The CO<sub>2</sub> sorption properties of F4_UiO-66(Ce) and F4_MIL-140A(Ce) were investigated, finding that they perform better than their Zr-based analogues. F4_MIL-140A(Ce) displays an unusual S-shaped isotherm with steep uptake increase at pressure < 0.2 bar at 298 K. This makes F4_MIL-140A(Ce) exceptionally selective for CO<sub>2</sub> over N<sub>2</sub>: the calculated selectivity, according to the ideal adsorbed solution theory for a 0.15:0.85 mixture at 1 bar and 293 K, is higher than 1900, amongst the highest ever reported for metal-organic frameworks. The calculated isosteric heat of CO<sub>2 </sub>adsorption is in the range of 38-40 kJ mol<sup>-1</sup>, indicating a strong physisorptive character.

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