Robust metal–organic framework with multiple traps for trace Xe/Kr separation

Zhang, Huiping; Fan, Yi; Krishna, Rajamani; Feng, Xuefeng; Wang, Li; Luo, Feng

doi:10.1016/j.scib.2020.12.031

Cited by 63 publications

(33 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Xe eluted at about 48 mins with a total Xe capture capacity of 25.8 mmol kg −1 . The value was higher than that of other materials listed in Table 1, such as Ni‐MOF‐74 (4.8 mmol kg −1 ), CC3 (11 mmol kg −1 ), MOF‐Cu‐H (13 mmol kg −1 ), SBMOF‐1 (13.2 mmol kg −1 ), [30, 33, 36, 39] but lower than ECUT‐60 (70.4 mmol g −1 ) [18] . Good recycling performance is the requirement for an adsorbent in practical industrial separation.…”

Section: Resultsmentioning

confidence: 61%

“…Porous material exhibiting only high Xe adsorption capacity (like ECUT-60 and ZU-62) or only excellent Xe/Kr selectivity (like Co-squarate), but not both, is not an ideal adsorbent. [18,24,41] With the suitable pore size and functionalized pore surfaces to capture Xe, although the hydrogenbonded frameworks reported here do not break the record in either capacity or selectivity, they strike an excellent balance between these two aspects.…”

Section: Methodsmentioning

confidence: 90%

“…The value was higher than that of other materials listed in Table 1, such as Ni-MOF-74 (4.8 mmol kg À 1 ), CC3 (11 mmol kg À 1 ), MOF-Cu-H (13 mmol kg À 1 ), SBMOF-1 (13.2 mmol kg À 1 ), [30,33,36,39] but lower than ECUT-60 (70.4 mmol g À 1 ). [18] Good recycling performance is the requirement for an adsorbent in practical industrial separation. The repeat dynamic breakthrough experiments for gas mixture containing a low concentration of noble gases under the same conditions further confirmed the efficient and stable separation performance of HOF-ZJU-201a (Figure S24).…”

Section: Forschungsartikelmentioning

confidence: 99%

See 2 more Smart Citations

Hydrogen‐Bonded Metal–Nucleobase Frameworks for Efficient Separation of Xenon and Krypton

Liu

Guo

et al. 2022

Angewandte Chemie

View full text Add to dashboard Cite

Xe/Kr separation is an industrially important but challenging process owing to their inert properties and low concentrations in the air. Energy‐effective adsorption‐based separation is a promising technology. Herein, two isostructural hydrogen‐bonded metal–nucleobase frameworks (HOF‐ZJU‐201 and HOF‐ZJU‐202) are capable of separating Xe/Kr under ambient conditions and strike an excellent balance between capacity and selectivity. The Xe capacity of HOF‐ZJU‐201a reaches 3.01 mmol g−1 at 298 K and 1.0 bar, while IAST selectivity and Henry's selectivity are 21.0 and 21.6, respectively. Direct breakthrough experiments confirmed the excellent separation performance, affording a Xe capacity of 25.8 mmol kg−1 from a Xe/Kr mixed‐gas at dilute concentrations. Density functional theory calculations revealed that the selective binding arises from the enhanced polarization in the confined electric field produced by the electron‐rich anions and the electron‐deficient purine heterocyclic rings.

show abstract

Section: Resultsmentioning

confidence: 61%

Section: Methodsmentioning

confidence: 90%

Section: Forschungsartikelmentioning

confidence: 99%

See 1 more Smart Citation

Hydrogen‐Bonded Metal–Nucleobase Frameworks for Efficient Separation of Xenon and Krypton

Liu

Guo

et al. 2022

Angewandte Chemie

View full text Add to dashboard Cite

show abstract

“…The adsorption selectivity is also evaluated by ideal adsorption solution theory (IAST), in light of the above single component isotherms at 298 K (Fig. 2c) [44][45][46][47] We further investigated the host-guest interaction between ECUT-Th-10 and these gases, which is mainly re ected on the isosteric heat of adsorption (Q st ). Thus, the adsorption of these gases at 273 K was carried out (Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The adsorption selectivity is also evaluated by ideal adsorption solution theory (IAST), in light of the above single component isotherms at 298 K (Fig. 2c) [44][45][46][47] . Ultrahigh selectivity up to 60 for C 3 H 8 /C 4 H 10 (50:50 v/v), 9.31 for C 3 H 8 /C 2 H 6 (50:50 v/v), and 54.5 for C 3 H 8 /CH 4 (50:50 v/v) is respectively observed at the onset of adsorption, also suggesting selective adsorption of propane.…”

Section: Resultsmentioning

confidence: 99%

Th-MOF showing six-fold imide-sealed pockets for middle-size-separation of propane from nature gas

Feng¹,

Wang²,

Gong³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Separation of propane from nature gas is of great importance to industry. However, in light of size-based separation, there still lacks effective method to directly separate propane from nature gas, due to the comparable physical properties for these light alkanes (C1-C4) and the middle size of propane. In this work, we found that a new Th-MOF could be an ideal solution for this issue. The Th-MOF takes UiO-66-type structure, but with the pocket sealed by six-fold imide groups; this not only precisely reduces the size of pocket to exactly match propane, but also enhances the host-guest interactions through multiple supramolecular interactions. As a result, highly selective adsorption of propane over methane, ethane, and butane was observed, implying unique middle-size separation. The actual separation was confirmed by breakthrough experiments, and it is found that both relatively smaller molecules (methane and ethane) and relatively bigger molecules (butane) break through the Th-MOF column within 10 min/g, whereas propane with middle size can maintain very long retention time up to 80 min/g, strongly suggesting middle-size separation and its superior application in direct separation of propane from nature gas. The separation mechanism, as unveiled by both theoretical calculation and comparative experiments, is due to the six-fold imide-sealed pockets that could effectively distinguish propane from other light alkanes through both size effect and host-guest interactions.

show abstract

Self‐Adjusting Metal–Organic Framework for Efficient Capture of Trace Xenon and Krypton

et al. 2022

View full text Add to dashboard Cite

The capture of the xenon and krypton from nuclear reprocessing off‐gas is essential to the treatment of radioactive waste. Although various porous materials have been employed to capture Xe and Kr, the development of high‐performance adsorbents capable of trapping Xe/Kr at very low partial pressure as in the nuclear reprocessing off‐gas conditions remains challenging. Herein, we report a self‐adjusting metal‐organic framework based on multiple weak binding interactions to capture trace Xe and Kr from the nuclear reprocessing off‐gas. The self‐adjusting behavior of ATC‐Cu and its mechanism have been visualized by the in‐situ single‐crystal X‐ray diffraction studies and theoretical calculations. The self‐adjusting behavior endows ATC‐Cu unprecedented uptake capacities of 2.65 and 0.52 mmol g−1 for Xe and Kr respectively at 0.1 bar and 298 K, as well as the record Xe capture capability from the nuclear reprocessing off‐gas. Our work not only provides a benchmark Xe adsorbent but proposes a new route to construct smart materials for efficient separations.

show abstract

Robust metal–organic framework with multiple traps for trace Xe/Kr separation

Cited by 63 publications

References 34 publications

Hydrogen‐Bonded Metal–Nucleobase Frameworks for Efficient Separation of Xenon and Krypton

Hydrogen‐Bonded Metal–Nucleobase Frameworks for Efficient Separation of Xenon and Krypton

Th-MOF showing six-fold imide-sealed pockets for middle-size-separation of propane from nature gas

Self‐Adjusting Metal–Organic Framework for Efficient Capture of Trace Xenon and Krypton

Contact Info

Product

Resources

About