The role of cations in the interactions between anionic N-heterocycles and SO2

Li, Chenchen; Lu, Dongmei; Wu, Chao

doi:10.1038/s41598-018-25432-6

Cited by 12 publications

(7 citation statements)

References 38 publications

(59 reference statements)

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“…In addition, this system retained its SO 2 capture over 50 cycles under mild reactivation conditions (80 °C and reduced pressure). In general, it is well documented that the presence of N-heterocycles improves SO 2 adsorption in both ILs and MOFs, 35 as will be further described. These examples show the relevance of the design of new approaches to improve gas capture.…”

Section: ■ Introductionmentioning

confidence: 82%

“…It is worth mentioning that techniques based on metal oxides are not yet commercially available for desulfurization processes, conversely to the case of Fe oxides, where higher temperatures are required to obtain better results, and in some cases water injection systems are highly recommended . These technical problems also occur in other adsorption processes developed for the capture of H 2 S and SO 2 using activated carbons (ACs), ionic liquids (ILs), − or aminosilanes …”

Section: Introductionmentioning

confidence: 99%

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MOF Materials for the Capture of Highly Toxic H₂S and SO₂

et al. 2020

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Metal−organic frameworks (MOFs) are some of the most interesting and promising candidates to sequester toxic H 2 S and SO 2 gases. MOFs show interesting advantages over classic porous materials due to their chemical composition, ligand functionality, cavity dimensions, ease of preparation, and relatively low cost reactivation. The optimization of the physical−chemical interactions between MOFs and H 2 S and SO 2 molecules is the key to further amplification of their capture. Reversibility after the adsorption of H 2 S and SO 2 can be modulated through noncovalent bonding between functionalized ligands (within MOF structures) and H 2 S and SO 2 . This review aims to summarize recent advances in the development of MOF-based systems for the capture and removal of H 2 S and SO 2 . We anticipate that this review article can offer very useful information on the significant and rapid progress of the enhancement of H 2 S and SO 2 capture by MOFs.

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Section: ■ Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

MOF Materials for the Capture of Highly Toxic H₂S and SO₂

et al. 2020

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“…Due to the unique chemical and physical properties, functionalized ionic liquids (ILs) with active sites on their cations or anions as a kind of alternative absorbent result in efficient gas capture. , For example, functionalized ILs with amine-containing cations, − ether-containing cations, − aprotic heterocyclic anions, − cyano-containing anions, , carbonyl-containing anion, − carboxylate anions, − and phenolate anions − have been designed and synthesized for improving SO 2 or CO 2 capture. These functionalized ILs are usually prepared through complicated processes, including cationization, anion-exchange, and acid–base neutralization, with kinds of organic solvents used and large quantities of wastewater produced which may enhance their cost and limit their large-scale applications. , …”

Section: Introductionmentioning

confidence: 99%

Tuning Environmentally Friendly Chelate-Based Ionic Liquids for Highly Efficient and Reversible SO₂ Chemisorption

Cui

Liu

et al. 2018

ACS Sustainable Chem. Eng.

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Because of lots of outstanding properties of ionic liquids (ILs), three kinds of environmentally friendly chelatebased ILs such as [Li(TDA-1)][SCN], [Li(TDA-1)][TFSI], and [Li(G3)][TFSI] were designed and synthesized in this work with easy procedure and no byproduct generation. Ligands of the ILs are cheap, nontoxic, thermally stable, and highly active. Density and viscosity of the ILs were determined, and they decreased linearly with increasing temperature. With the lowest flow activation energy, the [Li(TDA-1)][SCN], containing tertiary amine in the cation and thiocyanate as the anion, exhibited the highest absorption rate and remarkable SO 2 chemisorption capacity. The effect of SO 2 partial pressure and absorption temperature on the uptake performance of SO 2 were also investigated, where a high absorption capacity up to 2.36 and 2.01 mol SO 2 per mol IL can be achieved by [Li(TDA-1)][SCN] under low partial pressure of SO 2 (10 vol % SO 2 ) or high absorption temperature (70 °C), respectively. Spectroscopic investigations and quantum mechanical calculations show that the chemical interactions between SO 2 and two active sites (N and S) in ILs resulted in the high SO 2 absorption capacities. Furthermore, the chelate-based ionic liquids can be regenerated and recycled several times without losing capacity.

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“…It should be stressed that, unlike Fe oxides, where increased temperatures are needed to provide sufficient gas capture performance, techniques based on metal oxides are yet to be commercialized for desulfurization processes. These technical limitations can also occur in the case of other H 2 S adsorbents such as activated carbons, amino silanes, and ionic liquids [23][24][25].…”

Section: And Alomentioning

confidence: 99%

Hydrogen Sulfide (H2S) Removal via MOFs

et al. 2020

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The removal of the environmentally toxic and corrosive hydrogen sulfide (H2S) from gas streams with varying overall pressure and H2S concentration is a long-standing challenge faced by the oil and gas industries. The present work focuses on H2S capture using a relatively new type of material, namely metal-organic frameworks (MOFs), in an effort to shed light on their potential as adsorbents in the field of gas storage and separation. MOFs hold great promise as they make possible the design of structures from organic and inorganic units, but also as they have provided an answer to a long-term challenging objective, i.e., how to design extended structures of materials. Moreover, in designing MOFs, one may functionalize the organic units and thus, in essence, create pores with different functionalities, and also to expand the pores in order to increase pore openings. The work presented herein provides a detailed discussion, by thoroughly combining the existing literature on new developments in MOFs for H2S removal, and tries to provide insight into new areas for further research.

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The role of cations in the interactions between anionic N-heterocycles and SO2

Cited by 12 publications

References 38 publications

MOF Materials for the Capture of Highly Toxic H₂S and SO₂

MOF Materials for the Capture of Highly Toxic H₂S and SO₂

Tuning Environmentally Friendly Chelate-Based Ionic Liquids for Highly Efficient and Reversible SO₂ Chemisorption

Hydrogen Sulfide (H2S) Removal via MOFs

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The role of cations in the interactions between anionic N-heterocycles and SO2

Cited by 12 publications

References 38 publications

MOF Materials for the Capture of Highly Toxic H2S and SO2

MOF Materials for the Capture of Highly Toxic H2S and SO2

Tuning Environmentally Friendly Chelate-Based Ionic Liquids for Highly Efficient and Reversible SO2 Chemisorption

Hydrogen Sulfide (H2S) Removal via MOFs

Contact Info

Product

Resources

About

MOF Materials for the Capture of Highly Toxic H₂S and SO₂

MOF Materials for the Capture of Highly Toxic H₂S and SO₂

Tuning Environmentally Friendly Chelate-Based Ionic Liquids for Highly Efficient and Reversible SO₂ Chemisorption