Characterization of Adsorption Enthalpy of Novel Water-Stable Zeolites and Metal-Organic Frameworks

Kim, Hyunho; Cho, H. Jeremy; Narayanan, Shankar; Yang, Sungwoo; Furukawa, Hiroyasu; Schiffres, Scott N.; Li, Xiansen; Zhang, Yue‐Biao; Jiang, Juncong; Yaghi, Omar M.; Wang, Evelyn N.

doi:10.1038/srep19097

Cited by 74 publications

(43 citation statements)

References 33 publications

(49 reference statements)

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“…The isosteric enthalpy of water adsorption is 30% higher than that of silica gels, 37 and is on the same level as desiccants with high adsorption enthalpies, such as zeolite 13X. 38 The simulated enthalpy change during adsorption was equal to –4062.3 kJ kg –1 , and it is in excellent agreement with the experimental data which further validates our MD module. Such a property is good for applications such as heat pump.…”

supporting

confidence: 77%

Extraordinary water adsorption characteristics of graphene oxide

et al. 2018

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supporting

confidence: 77%

Extraordinary water adsorption characteristics of graphene oxide

et al. 2018

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“…An isothermal step at 373 K (60 min) and cooling step from 373 to 348 K (5 min) was conducted in between these two heating ramps. A repetition of the heating steps was performed to create a baseline for the DSC curve and the desorption enthalpies determined as described elsewhere (Kim et al 2016).…”

Section: Analytical and Spectroscopic Methodsmentioning

confidence: 99%

Effect of aluminum and sodium on the sorption of water and methanol in microporous MFI-type zeolites and mesoporous SBA-15 materials

Rieg

Beurer

et al. 2020

Adsorption

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The interaction and nature of surface sites for water and methanol sorption on MFI-type zeolites and mesoporous SBA-15 were investigated by solid-state NMR spectroscopy and correlated with the desorption enthalpies determined via TGA/DSC. For siliceous Silicalite-1, 29Si CPMAS NMR studies support stronger methanol than water interactions with SiOH groups of Q3-type. On siliceous SBA-15, SiOH groups of Q2-type are accompanied by an enhanced hydrophilicity. In aluminum-containing Na-ZSM-5, Na+ cations are strong adsorption sites for water and methanol as evidenced by 23Na MAS NMR in agreement with high desorption enthalpies of ΔH = 66–74 kJ/mol. Solid-state NMR of aluminum-containing Na-[Al]SBA-15, in contrast, has shown negligible water and methanol interactions with sodium and aluminum. Desorption enthalpies of ΔH = 44–60 kJ/mol hint at adsorption sites consisting of SiOH groups influenced by distant framework aluminum. On H-ZSM-5, Brønsted acidic OH groups are strong adsorption sites as indicated by partial protonation of water and methanol causing low-field shifts of their 1H MAS NMR signals and enhanced desorption enthalpies. Due to the small number of Brønsted acid sites in aluminum-containing H-[Al]SBA-15, water and methanol adsorption on this material is suggested to mainly occur at SiOH groups with distant framework aluminum species, as in the case of Na-[Al]SBA-15.

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“…Typically, N 2 gas is used for this purpose . However, other gases, for instance Ar or CO 2 or even organic vapors (dynamic vapor sorption) may also be used . While there have been attempts to use H 2 , they remained in the form of discussion .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the BET Theory for the Characterization of Meso and Microporous MOFs

et al. 2018

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Surface area determination with the Brunauer–Emmett–Teller (BET) method is a widely used characterization technique for metal–organic frameworks (MOFs). Since these materials are highly porous, the use of the BET theory can be problematic. Several researchers have evaluated the BET method to gain insights into the usefulness of the obtained results and interestingly, their findings are not always consistent. In this review, the suitability of the BET method is discussed for MOFs that have a diverse range of pore widths below the diameters of N2 or Ar and above 20 Å. In addition, the surface area of MOFs that are obtained by implementing different approaches, such as grand canonical Monte Carlo simulations, calculations from the crystal structures or based on experimental N2, Ar, or CO2 adsorption isotherms, are compared and evaluated. Inconsistencies in the state‐of‐the‐art are also noted. Based on the current literature, an overview is provided of how the BET method can give useful estimations of the surface areas for the majority of MOFs, but there are some crucial and specific exceptions which are highlighted in this review.

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Characterization of Adsorption Enthalpy of Novel Water-Stable Zeolites and Metal-Organic Frameworks

Cited by 74 publications

References 33 publications

Extraordinary water adsorption characteristics of graphene oxide

Extraordinary water adsorption characteristics of graphene oxide

Effect of aluminum and sodium on the sorption of water and methanol in microporous MFI-type zeolites and mesoporous SBA-15 materials

Evaluation of the BET Theory for the Characterization of Meso and Microporous MOFs

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