Equimolar CO<sub>2</sub> Capture by N‐Substituted Amino Acid Salts and Subsequent Conversion

Liu, Anhua; Ma, Ran; Song, Chan; Yang, Zhenzhen; Yu, Ao; Cai, Yu; He, Liang‐Nian; Zhao, Yanan; Yu, Bing; Song, Qing‐Wen

doi:10.1002/anie.201205362

Cited by 210 publications

(114 citation statements)

References 50 publications

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“…14 Amino acid salt (AAs) solvents have been evaluated as alternatives for alkanolamines for CO 2 removal because of their superior thermal stability, excellent biocompatibility, and negligible volatility. 10,15,16 Studies aimed at modeling the molecular chemistry of CO 2 /AAs systems are numerous, but few experimental investigations have dealt with quantitative determination of the solution speciation of real absorbing and desorbing systems based on AAs. A better understanding of the reactions occurring in both absorption and desorption processes through the identification of chemical species produced in the CO 2 /AAs system will facilitate developing faster and more efficient absorbents for CO 2 capture and sequestration and to make the process less energy demanding.…”

Section: Introductionmentioning

confidence: 99%

Nuclear Magnetic Resonance Studies of CO₂ Absorption and Desorption in Aqueous Sodium Salt of Alanine

Wang

Akhmedov²,

Duan

et al. 2015

Energy Fuels

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For the first time, speciation evolution in aqueous sodium salt of alanine (SSA) solution during both CO 2 absorption and desorption has been investigated via nuclear magnetic resonance (NMR) spectroscopy. Results suggest that amine, carbamate, and bicarbonate are the main species formed in the solvent system. During CO 2 absorption, deprotonated alanine (Ala) reacts with CO 2 first to form carbamate, which subsequently hydrolyzes into bicarbonate. At higher CO 2 loadings (∼0.6 mol/mol of Ala), it appears that bicarbonate is dominant. Interestingly, the carbamate concentration in the SSA solution increases first and then decreases slightly during CO 2 desorption, and the amount of carbamate after CO 2 desorption is more than that at the end of the CO 2 absorption, thus reducing the desorption efficiency. Furthermore, the species distributions have also been compared to those of the commercial monoethanolamine (MEA) absorbent, revealing that the main difference between SSA and MEA systems is the hydrolysis rate of carbamate. Determination of the species formed is a first step to understand the chemistry of the solvent system, which may facilitate developing more efficient and energy-saving solvents for CO 2 capture and sequestration.

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Section: Introductionmentioning

confidence: 99%

Nuclear Magnetic Resonance Studies of CO₂ Absorption and Desorption in Aqueous Sodium Salt of Alanine

Wang

Akhmedov²,

Duan

et al. 2015

Energy Fuels

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“…Therefore, searching for taskspecific ILs for sustainable processes of chemical reactions, product separation, and catalyst and IL recycling is a longstanding topic. Considering the fact that the most interesting feature of ILs is that their structures and properties can be fine-tuned by a judicious variation of the cation and anion, we were interested in the creating of a class of thermo-responsive ILs which can reversibly transfer between water and organic phases to achieve easy separation and recycling of catalyst.It is known that the bis(trifluoromethanesulfonyl)imide anion ([NTf 2 ] À ) is a strongly hydrophobic ion, [19] whereas poly(ethylene glycol) (PEG) is hydrophilic and has the ability to dissolve ILs, [20] as well as to coordinate with metallic organic salts [21] and inorganic salts. [22] In this work, a PEG unit was functionalized on both ends with methylimidazolium cations, and then paired with [NTf 2 ]…”

mentioning

confidence: 99%

Tuning the Hydrophilicity and Hydrophobicity of the Respective Cation and Anion: Reversible Phase Transfer of Ionic Liquids

Yao

Cui

et al. 2016

Angew Chem Int Ed

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The separation and recycling of catalyst and cocatalyst from the products and solvents are of critical importance. In this work, a class of functionalized ionic liquids (ILs) were designed and synthesized, and by tuning the hydrophilicity and hydrophobicity of cation and anion, respectively, these ILs could reversibly transfer between water and organics triggered upon undergoing a temperature change. From a combination of multiple spectroscopic techniques, it was shown that the driving force behind the transfer was originated from a change in conformation of the PEG chain of the IL upon temperature variation. By utilizing the novel property of this class of ILs, a highly efficient and controllable CuI-catalyzed cycloaddition reaction was achieved wherein the IL was used to entrain, activate, and recycle the catalyst, as well as to control the reaction.

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“…One more thing to note here is that the CO 2 uptake capacity in the present study is influenced not only by the specific surface area but also by the number of reactive amine sites in the pore, since the amine groups on the amino acids could interact with adsorbed CO 2 molecules to form carbamates by a zwitterionic mechanism even at low temperature. [30][31][32] …”

Section: Co 2 Uptakementioning

confidence: 98%

Intercalative Ion‐Exchange Route to Amino Acid Layered Double Hydroxide Nanohybrids and Their Sorption Properties

et al. 2015

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A soft chemical route to amino acid layered double hydroxide (LDH) nanohybrids was demonstrated on the basis of an intercalative ion-exchange reaction. Two different amino acids, phenylalanine and glutamic acid, were intercalated and stabilized in the interlayer space of a 2-dimensional double hydroxide lattice by electrostatic interaction. An attempt was also made to understand the effect of the intracrystalline structure of the amino acid in the LDH on the specific surface area, porosity, and gas sorption properties of the hybrid. According to the X-ray diffraction analysis, the basal spacings of LDH intercalated with phenylalanine and LDH intercalated with glutamic acid were expanded to 1.80 and 1.22 nm, respectively, relative to that of the pristine Mg 2 Al-NO 3 -LDH

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Equimolar CO₂ Capture by N‐Substituted Amino Acid Salts and Subsequent Conversion

Cited by 210 publications

References 50 publications

Nuclear Magnetic Resonance Studies of CO₂ Absorption and Desorption in Aqueous Sodium Salt of Alanine

Nuclear Magnetic Resonance Studies of CO₂ Absorption and Desorption in Aqueous Sodium Salt of Alanine

Tuning the Hydrophilicity and Hydrophobicity of the Respective Cation and Anion: Reversible Phase Transfer of Ionic Liquids

Intercalative Ion‐Exchange Route to Amino Acid Layered Double Hydroxide Nanohybrids and Their Sorption Properties

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Equimolar CO2 Capture by N‐Substituted Amino Acid Salts and Subsequent Conversion

Cited by 210 publications

References 50 publications

Nuclear Magnetic Resonance Studies of CO2 Absorption and Desorption in Aqueous Sodium Salt of Alanine

Nuclear Magnetic Resonance Studies of CO2 Absorption and Desorption in Aqueous Sodium Salt of Alanine

Tuning the Hydrophilicity and Hydrophobicity of the Respective Cation and Anion: Reversible Phase Transfer of Ionic Liquids

Intercalative Ion‐Exchange Route to Amino Acid Layered Double Hydroxide Nanohybrids and Their Sorption Properties

Contact Info

Product

Resources

About

Equimolar CO₂ Capture by N‐Substituted Amino Acid Salts and Subsequent Conversion

Nuclear Magnetic Resonance Studies of CO₂ Absorption and Desorption in Aqueous Sodium Salt of Alanine

Nuclear Magnetic Resonance Studies of CO₂ Absorption and Desorption in Aqueous Sodium Salt of Alanine