Harnessing solvent effects to integrate alkylamine into metal–organic frameworks for exceptionally high CO<sub>2</sub> uptake

Li, Hao; Wang, Kecheng; Hu, Zhigang; Chen, Ying-Pin; Verdegaal, Wolfgang M.; Zhao, Dan; Zhou, Hong‐Cai

doi:10.1039/c8ta11300a

Cited by 46 publications

(41 citation statements)

References 62 publications

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“…In recent years, the highly charged metal‐containing secondary building units (SBUs) were frequently employed to fabricate chemically stable MOFs (e.g., Zr‐MOFs and MIL series of MOFs). [ 98,99 ] Since the pioneer Férey et al first reported the Cr‐based MOF (named MIL‐101) in 2005, [ 100 ] it has been extensively studied in many fields, such as gas adsorption and separation, [ 101 ] heterogeneous catalytic, [ 102 ] and proton conduction, [ 43,44,103–106 ] which is mainly attributed to its high surface area, mesoporous feature and excellent chemical stability.…”

Section: Mofs As a Versatile Platform For Proton Conductorsmentioning

confidence: 99%

Metal–Organic Frameworks as a Versatile Platform for Proton Conductors

et al. 2020

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Metal–organic frameworks (MOFs) are an intriguing type of crystalline porous materials that can be readily built from metal ions or clusters and organic linkers. Recently, MOF materials, featuring high surface areas, rich structural tunability, and functional pore surfaces, which can accommodate a variety of guest molecules as proton carriers and to systemically regulate the proton concentration and mobility within the available space, have attracted tremendous attention for their roles as solid electrolytes in fuel cells. Recent advances in MOFs as a versatile platform for proton conduction in the field of humidity condition proton‐conduction, anhydrous atmosphere proton‐conduction, single‐crystal proton‐conduction, and including MOF‐based membranes for fuel cells, are summarized and highlighted. Furthermore, the challenges, future trends, and prospects of MOF materials for solid electrolytes are also discussed.

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Section: Mofs As a Versatile Platform For Proton Conductorsmentioning

confidence: 99%

Metal–Organic Frameworks as a Versatile Platform for Proton Conductors

et al. 2020

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“…Less polar solvents, or even better nonpolar, are more suitable for the encapsulation of an alkylamine into MOFs, promoting the CO 2 uptakes. [94] Hence, amine functionalized MOFs, which allow chemisorption of CO 2 , appear as superior materials for practical applications.…”

Section: Mofs As Chemisorbents For Co 2 Capturementioning

confidence: 99%

“…The loading grade of the MIL‐101(Cr) was demonstrated to be related to the polarity of the solvent used for the tethering process. Less polar solvents, or even better nonpolar, are more suitable for the encapsulation of an alkylamine into MOFs, promoting the CO 2 uptakes …”

Section: Introductionmentioning

confidence: 99%

Strategies to Enhance Carbon Dioxide Capture in Metal‐Organic Frameworks

Piscopo

Loebbecke

2020

ChemPlusChem

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The dramatic increase of atmospheric CO2 concentration is responsible for a fast and potentially unpredictable global climate change. Therefore, the implementation of negative carbon technologies such as direct air capture (DAC) is needed. Metal–organic frameworks (MOFs) have the potential to perform CO2 DAC and achieve unprecedented performances. Herein strategies to improve the CO2 capture efficiency of MOFs and their potential implementation in real applications are discussed. Three main categories of targeted modifications to the frameworks are usually performed to enhance the CO2 uptake capacity and adsorption selectivity: 1) modifications to the metal unit; 2) modifications to the linker unit; 3) confinement of solvents within MOFs. The synthesis of MOF composites using other porous materials as support is also a useful method to improve the CO2 capture performances. Another approach involves the synthesis of amine‐functionalized MOFs that can chemically bind carbon dioxide.

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“…There are two obvious broad diffraction peaks at 1230-1450 cm −1 (D peak) and 1450-1580 cm −1 (G peak) in all samples. Serious widening of D and G peak of Raman spectra indicates the existence of many sp 2 and sp 2 -sp 3 hybridized structure in incomplete graphitized materials [38,39]. It is necessary to resolve overlapped peaks by using fitting treatment at 1300 cm −1 (D 1 peak), 1520 cm −1 (D 3 peak), 1200 cm −1 (D 4 peak), and 1550 cm −1 (G peak).…”

Section: Carbon Structure Analysis Of Samples At Different Ammonia Acmentioning

confidence: 99%

“…With the development of human society, massive emissions of CO 2 from fossil fuel combustion cause serious pollution on the environment and pose a threat to human health [1]. A post-combustion capture (PCC) technology including chemical and physical absorption methods can capture effectively CO 2 from flue gas [2], but a chemical absorption method using organic amine (such as alkanolamine and ethanolamine) now faces the dilemma of equipment corrosion, high capital cost, and solvent consumption [3]; thus, a physical absorption method using carbon-based porous materials, such as activated carbons (ACs), has been extensively explored, to remove CO 2 from flue gas, due to its advantages of being low in cost, highly efficient, and environmentally sustainable [4]. In addition, using methane as a carbon source could accurately adjust the pore size to promote CO 2 adsorption and separation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ammonia Activation and Chemical Vapor Deposition on the Physicochemical Structure of Activated Carbons for CO2 Adsorption

Liu

Dong

et al. 2019

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Focusing on the bottlenecks of traditional physical activation method for the preparation of activated carbons (ACs), we established a simple and scalable method to control the physicochemical structure of ACs and study their CO2 adsorption performance. The preparation is achieved by ammonia activation at different volume fractions of ammonia in the mixture (10%, 25%, 50%, 75%, and 100%) to introduce the nitrogen-containing functional groups and form the original pores and subsequent chemical vapor deposition (CVD) at different deposition times (30, 60, 90, and 120 min) to further adjust the pore structure. The nitrogen content of ACs-0.1/0.25/0.5/0.75/1 increases gradually from 2.11% to 8.84% with the increase of ammonia ratio in the mixture from 10% to 75% and then decreases to 3.02% in the process of pure ammonia activation (100%), during which the relative content of pyridinium nitrogen (N-6), pyrrolidine (N-5), and graphite nitrogen (N-Q) increase sequentially but nitrogen oxygen structure (N-O) increase continuously. In addition, ACs-0.5 and ACs-0.75, with a relatively high nitrogen content (6.37% and 8.84%) and SBET value (1048.65 m2/g and 814.36 m2/g), are selected as typical samples for subsequent CVD. In the stage of CVD, ACs-0.5-60 and ACs-0.75-90, with high SBET (1897.25 and 1971.57 m2/g) value and an appropriate pore-size distribution between 0.5 and 0.8 nm, can be obtained with the extension of deposition time from 60 to 90 min. The results of CO2 adsorption test indicate that an adsorption capacity of ACs-0.75-90, at 800 mmHg, is the largest (6.87 mmol/g) out of all the tested samples. In addition, the comparison of CO2 adsorption performance of tested samples with different nitrogen content and pore structure indicates that the effect of nitrogen content seems to be more pronounced in this work.

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Harnessing solvent effects to integrate alkylamine into metal–organic frameworks for exceptionally high CO₂ uptake

Abstract: Alkylamine modified MOF prepared with a less polar solvent (cyclohexane) has a higher alkylamine loading amount and higher CO2 uptake than when prepared in a more polar solvent (dichloromethane).

Cited by 46 publications

References 62 publications

Metal–Organic Frameworks as a Versatile Platform for Proton Conductors

Metal–Organic Frameworks as a Versatile Platform for Proton Conductors

Strategies to Enhance Carbon Dioxide Capture in Metal‐Organic Frameworks

Effect of Ammonia Activation and Chemical Vapor Deposition on the Physicochemical Structure of Activated Carbons for CO2 Adsorption

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Harnessing solvent effects to integrate alkylamine into metal–organic frameworks for exceptionally high CO2 uptake

Abstract: Alkylamine modified MOF prepared with a less polar solvent (cyclohexane) has a higher alkylamine loading amount and higher CO2 uptake than when prepared in a more polar solvent (dichloromethane).

Cited by 46 publications

References 62 publications

Metal–Organic Frameworks as a Versatile Platform for Proton Conductors

Metal–Organic Frameworks as a Versatile Platform for Proton Conductors

Strategies to Enhance Carbon Dioxide Capture in Metal‐Organic Frameworks

Effect of Ammonia Activation and Chemical Vapor Deposition on the Physicochemical Structure of Activated Carbons for CO2 Adsorption

Contact Info

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Harnessing solvent effects to integrate alkylamine into metal–organic frameworks for exceptionally high CO₂ uptake