Microporous triazine-based ionic hyper-crosslinked polymers for efficient and selective separation of H2S/CH4/N2

Gu, Jiarui; Shao, Pingping; Luo, Liuxuan; Wang, Yizhou; Zhao, Tianxiang; Yang, Chunliang; Chen, Peng; Liu, Fei

doi:10.1016/j.seppur.2021.120377

Cited by 30 publications

(13 citation statements)

References 65 publications

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“…The new peaks produced at 1287 and 1046 cm –1 can be attributed to the antisymmetric and asymmetric stretching vibrations of SO, ,, indicating that there is existence of physical interaction between ether, oxygen, and SO 2 . The new peak at 959 cm –1 can be attributed to the stretching vibration of the S–O bond, which implies a possible weak chemical absorption between [TMEA][MOAc] and SO 2 . ,, The peaks around 648 and 572 cm –1 are attributed to bending vibrations for the SO. ,, Combined with the thermodynamic discussion, it is clear that the dominant reason for the high absorption capacity of [TMEA][MOAc] for SO 2 is the O–SO 2 physical interaction. Notably, these new peaks almost disappear after regeneration of the [TMEA][MOAc].…”

Section: Results and Discussionmentioning

confidence: 77%

“…60 The new peak at 959 cm −1 can be attributed to the stretching vibration of the S−O bond, which implies a possible weak chemical absorption between [TMEA][MOAc] and SO 2 . 14,61,62 The peaks around 648 and 572 cm −1 are attributed 14a. The chemical shifts of H 1 and H 2 move downfield from 2.63 to 3.25 ppm and from 3.39 to 3.64 ppm, respectively, indicating a strong N− SO 2 interaction between SO 2 and tertiary amine.…”

Section: Regeneration Of [Tmea][moac]mentioning

confidence: 99%

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Rich Ether-Based Protic Ionic Liquids with Low Viscosity for Selective Absorption of SO₂ through Multisite Interaction

Liu

Cai

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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Four low-viscosity protic ionic liquids (PILs) with the tertiary amine and rich ether skeletons are designed for selective absorption of SO2. To evaluate the selective absorption of SO2 by these PILs, the solubilities of SO2, CO2, and H2S are measured in the temperature range of 303.2–333.2 K and pressures up to 120 kPa by a volumetric method, respectively. The absorption of SO2 by [TMEA][MOAc] at 303.2 K and 101.3 kPa was found to be 10.424 mol·kg–1 (4.310 mol·mol–1), and the ideal selectivity of SO2/CO2 was 86.83. In addition, the solubility data are fitted using a reaction equilibrium thermodynamic model to obtain thermodynamics parameters including Gibbs free energy change (Δr G m), enthalpy change (Δr H m, Δphy H m, Δchem H m), and entropy change (Δr S m). The mechanism of SO2 absorption by [TMEA][MOAc] is also investigated by FTIR and NMR analyses. Mechanistic and thermodynamic studies suggest that the high SO2 absorption is attributed to the O–SO2 multisite physical interaction. These ether-rich PILs are considered as a promising absorber because of their high SO2 solubility, good cycling performance, and low viscosity before and after absorption.

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Section: Results and Discussionmentioning

confidence: 77%

Section: Regeneration Of [Tmea][moac]mentioning

confidence: 99%

Rich Ether-Based Protic Ionic Liquids with Low Viscosity for Selective Absorption of SO₂ through Multisite Interaction

Liu

Cai

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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“…Concerning gas adsorption, few studies exist, thus highlighting the necessity to carry out other studies [ 14 , 21 ]. In fact, a study concerning the adsorption of H 2 S by organic polymer used a microporous triazine-based ionic hyper-crosslinked polymer not obtained by the Schiff-base reaction [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

“…Yet, it is lower than for microporous triazine-based ionic hyper-crosslinked polymers, which showed values of 3.91–4.85 mmol/g. This difference may be attributed not only to structural factors and a higher A BET , but also to the presence of charges, which may increase the interaction with H 2 S [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

Evaluation of an Imine-Linked Polymer Organic Framework for Storage and Release of H2S and NO

et al. 2023

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Hydrogen sulfide (H2S) and nitric oxide (NO) are especially known as toxic and polluting gases, yet they are also endogenously produced and play key roles in numerous biological processes. These two opposing aspects of the gases highlight the need for new types of materials to be developed in addition to the most common materials such as activated carbons and zeolites. Herein, a new imine-linked polymer organic framework was obtained using the inexpensive and easy-to-access reagents isophthalaldehyde and 2,4,6-triaminopyrimidine in good yield (64%) through the simple and catalyst-free Schiff-base reaction. The polymeric material has microporosity, an ABET surface area of 51 m2/g, and temperature stability up to 300 °C. The obtained 2,4,6-triaminopyrimidine imine-linked polymer organic material has a higher capacity to adsorb NO (1.6 mmol/g) than H2S (0.97 mmol/g). Release studies in aqueous solution showed that H2S has a faster release (3 h) from the material than NO, for which a steady release was observed for at least 5 h. This result is the first evaluation of the possibility of an imine-linked polymer organic framework being used in the therapeutic release of NO or H2S.

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“…They have a wide range of applications in selective gas sorption 33 and separation. 34 More recently, this novel class of material offers great promise in heterogeneous catalysis, particularly in the gas phase due to their gas-enrichment capability. 35 Furthermore, to the introduction of new catalytic sites in the materials, the distinct micropore channel will show a confinement effect in some catalytic reactions, which may either improve the product selectivity by favoring the main reaction pathway through chemical confinement or improving the turnover numbers by reducing the amount of catalyst required.…”

Section: ■ Introductionmentioning

confidence: 99%

N-Heterocyclic Carbene Moiety in Highly Porous Organic Hollow Nanofibers for Efficient CO₂ Conversions: A Comparative Experimental and Theoretical Study

Bhattacharjee,

Tripathi,

Chatterjee

et al. 2024

ACS Catal.

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Global warming and climate change are two severe environmental dangers brought on by the steady rise in the carbon dioxide (CO 2 ) concentration in the atmosphere. Thus, in order to reduce this problem, it is essential to find an efficient material for high CO 2 capture that can simultaneously exhibit good catalytic activity for CO 2 utilization into useful chemicals. Herein, we report the synthesis of N-heterocyclic carbene-based porous organic polymers (NHC-01 and NHC-02) using the Friedel−Crafts reaction with the imidazolium salt and bi-phenyl. Among the two porous polymers, NHC-01 exhibited outstanding stability, high flexibility, and high BET surface area (1298 m 2 g −1 ). NHC-01 material displayed a high CO 2 uptake capacity of 2.85 mmol g −1 under 1.0 bar pressure at 273 K. NHC-01/02 has been utilized as a metal-free organocatalyst for the CO 2 conversion reaction due to its high surface area, high CO 2 absorption capacity, and as it bears the NHC moiety in the organic network. NHC-01 selectively reduced CO 2 to methanol via hydrosilylation with complete conversion of silane under atmospheric CO 2 pressure. Furthermore, the catalyst also shows good catalytic activity toward Nformylation and reductive cyclization reactions, which showed good yields up to at least four catalytic cycles. The reaction mechanisms are also studied by theoretical simulation using density functional theory (DFT), which shows that intermediates have the appropriate free energy level for the catalyst to promote the reaction with a low energy barrier.

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Microporous triazine-based ionic hyper-crosslinked polymers for efficient and selective separation of H2S/CH4/N2

Cited by 30 publications

References 65 publications

Rich Ether-Based Protic Ionic Liquids with Low Viscosity for Selective Absorption of SO₂ through Multisite Interaction

Rich Ether-Based Protic Ionic Liquids with Low Viscosity for Selective Absorption of SO₂ through Multisite Interaction

Evaluation of an Imine-Linked Polymer Organic Framework for Storage and Release of H2S and NO

N-Heterocyclic Carbene Moiety in Highly Porous Organic Hollow Nanofibers for Efficient CO₂ Conversions: A Comparative Experimental and Theoretical Study

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Microporous triazine-based ionic hyper-crosslinked polymers for efficient and selective separation of H2S/CH4/N2

Cited by 30 publications

References 65 publications

Rich Ether-Based Protic Ionic Liquids with Low Viscosity for Selective Absorption of SO2 through Multisite Interaction

Rich Ether-Based Protic Ionic Liquids with Low Viscosity for Selective Absorption of SO2 through Multisite Interaction

Evaluation of an Imine-Linked Polymer Organic Framework for Storage and Release of H2S and NO

N-Heterocyclic Carbene Moiety in Highly Porous Organic Hollow Nanofibers for Efficient CO2 Conversions: A Comparative Experimental and Theoretical Study

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Product

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Rich Ether-Based Protic Ionic Liquids with Low Viscosity for Selective Absorption of SO₂ through Multisite Interaction

Rich Ether-Based Protic Ionic Liquids with Low Viscosity for Selective Absorption of SO₂ through Multisite Interaction

N-Heterocyclic Carbene Moiety in Highly Porous Organic Hollow Nanofibers for Efficient CO₂ Conversions: A Comparative Experimental and Theoretical Study