101
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Shkrob IA, Marin TW. The AHA Moment: Assessment of the Redox Stability of Ionic Liquids Based on Aromatic Heterocyclic Anions (AHAs) for Nuclear Separations and Electric Energy Storage. J Phys Chem B 2015; 119:14766-79. [PMID: 26506410 DOI: 10.1021/acs.jpcb.5b09057] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Because of their extended conjugated bond network, aromatic compounds generally have higher redox stability than less saturated compounds. We conjectured that ionic liquids (ILs) consisting of aromatic heterocyclic anions (AHAs) may exhibit improved radiation and electrochemical stability. Such properties are important in applications of these ILs as diluents in radionuclide separations and electrolytes in the electric energy storage devices. In this study, we systematically examine the redox chemistry of the AHAs. Three classes of these anions have been studied: (i) simple 5-atom ring AHAs, such as the pyrazolide and triazolides, (ii) AHAs containing an adjacent benzene ring, and (iii) AHAs containing electron-withdrawing groups that were introduced to reduce their basicity and interaction with metal ions. It is shown that fragmentation in the reduced and oxidized states of these AHAs does not generally occur, and the two main products, respectively, are the H atom adduct and the imidyl radical. The latter species occurs either as an N σ-radical or as an N π-radical, depending on the length of the N-N bond, and the state that is stabilized in the solid matrix is frequently different from that having the lowest energy in the gas phase. In some instances, the formation of the sandwich π-stack dimer radical anions has been observed. For trifluoromethylated anions, H adduct formation did not occur; instead, there was facile loss of fluoride from their fluorinated groups. The latter can be problematic in nuclear separations, but beneficial in batteries. Overall, our study suggests that AHA-based ILs are viable candidates for use as radiation-exposed diluents and electrolytes.
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Affiliation(s)
- Ilya A Shkrob
- Chemical Sciences and Engineering Division, Argonne National Laboratory , 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - Timothy W Marin
- Chemical Sciences and Engineering Division, Argonne National Laboratory , 9700 South Cass Avenue, Argonne, Illinois 60439, United States.,Chemistry Department, Benedictine University , 5700 College Road, Lisle, Illinois 60532, United States
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102
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Sun L, Morales-Collazo O, Xia H, Brennecke JF. Effect of Structure on Transport Properties (Viscosity, Ionic Conductivity, and Self-Diffusion Coefficient) of Aprotic Heterocyclic Anion (AHA) Room-Temperature Ionic Liquids. 1. Variation of Anionic Species. J Phys Chem B 2015; 119:15030-9. [DOI: 10.1021/acs.jpcb.5b09175] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Liyuan Sun
- Department of Chemical and
Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Oscar Morales-Collazo
- Department of Chemical and
Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Han Xia
- Department of Chemical and
Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Joan F. Brennecke
- Department of Chemical and
Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
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103
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Huang K, Wu YT, Dai S. Sigmoid Correlations for Gas Solubility and Enthalpy Change of Chemical Absorption of CO2. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b02145] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kuan Huang
- Department
of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
- School
of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210093, P. R. China
| | - You-Ting Wu
- School
of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210093, P. R. China
| | - Sheng Dai
- Department
of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
- Chemical
Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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104
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Hollingsworth N, Taylor SFR, Galante MT, Jacquemin J, Longo C, Holt KB, de Leeuw NH, Hardacre C. Reduction of Carbon Dioxide to Formate at Low Overpotential Using a Superbase Ionic Liquid. Angew Chem Int Ed Engl 2015; 54:14164-8. [PMID: 26403938 PMCID: PMC4648032 DOI: 10.1002/anie.201507629] [Citation(s) in RCA: 113] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Indexed: 11/06/2022]
Abstract
A new low-energy pathway is reported for the electrochemical reduction of CO2 to formate and syngas at low overpotentials, utilizing a reactive ionic liquid as the solvent. The superbasic tetraalkyl phosphonium ionic liquid [P66614][124Triz] is able to chemisorb CO2 through equimolar binding of CO2 with the 1,2,4-triazole anion. This chemisorbed CO2 can be reduced at silver electrodes at overpotentials as low as 0.17 V, forming formate. In contrast, physically absorbed CO2 within the same ionic liquid or in ionic liquids where chemisorption is impossible (such as [P66614][NTf2]) undergoes reduction at significantly increased overpotentials, producing only CO as the product.
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Affiliation(s)
- Nathan Hollingsworth
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ (UK)
| | - S F Rebecca Taylor
- School of Chemistry and Chemical Engineering, Queen's University Belfast, David Keir Building, Belfast, BT9 5AG (UK)
| | - Miguel T Galante
- Institute of Chemistry, University of Campinas-UNICAMP, Campinas, SP (Brazil)
| | - Johan Jacquemin
- School of Chemistry and Chemical Engineering, Queen's University Belfast, David Keir Building, Belfast, BT9 5AG (UK)
| | - Claudia Longo
- Institute of Chemistry, University of Campinas-UNICAMP, Campinas, SP (Brazil)
| | - Katherine B Holt
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ (UK)
| | - Nora H de Leeuw
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ (UK)
| | - Christopher Hardacre
- School of Chemistry and Chemical Engineering, Queen's University Belfast, David Keir Building, Belfast, BT9 5AG (UK).
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105
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Reduction of Carbon Dioxide to Formate at Low Overpotential Using a Superbase Ionic Liquid. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201507629] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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106
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Tang H, Lu D. Multiple-Site SO 2 -Capture Ionic Liquids with Nearly Uniform Site Performance. Chemphyschem 2015; 16:2854-2860. [PMID: 29911746 DOI: 10.1002/cphc.201500369] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Revised: 06/29/2015] [Indexed: 11/09/2022]
Abstract
We propose a series of azolium poly(azolyl)borate ionic liquids (ILs) for reversible SO2 capture. Density functional calculations demonstrate that the designed borate anions can strongly bond to SO2 at multiple sites with nearly uniform binding energies. Thus, as well as high overall uptakes, the ILs can achieve much higher effective uptakes (the uptake difference between absorption and desorption conditions) than existing SO2 -capture reagents. The larger size of the borate anions, the evenly distributed negative charge among the azolyl rings, and the blocking of the conjugation by the tetrahedral boron concertedly reduce absorbate-absorbate repulsion, which leads to a large disparity among binding sites in other multiple-site SO2 sorbents.
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Affiliation(s)
- Huarong Tang
- School of Materials Science and Engineering, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049 (China)
| | - Dongmei Lu
- Department of Applied chemistry, School of Science, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049 (China)
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107
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Brinzer T, Berquist EJ, Ren Z, Dutta S, Johnson CA, Krisher CS, Lambrecht DS, Garrett-Roe S. Ultrafast vibrational spectroscopy (2D-IR) of CO2 in ionic liquids: Carbon capture from carbon dioxide's point of view. J Chem Phys 2015; 142:212425. [PMID: 26049445 DOI: 10.1063/1.4917467] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The CO2ν3 asymmetric stretching mode is established as a vibrational chromophore for ultrafast two-dimensional infrared (2D-IR) spectroscopic studies of local structure and dynamics in ionic liquids, which are of interest for carbon capture applications. CO2 is dissolved in a series of 1-butyl-3-methylimidazolium-based ionic liquids ([C4C1im][X], where [X](-) is the anion from the series hexafluorophosphate (PF6 (-)), tetrafluoroborate (BF4 (-)), bis-(trifluoromethyl)sulfonylimide (Tf2N(-)), triflate (TfO(-)), trifluoroacetate (TFA(-)), dicyanamide (DCA(-)), and thiocyanate (SCN(-))). In the ionic liquids studied, the ν3 center frequency is sensitive to the local solvation environment and reports on the timescales for local structural relaxation. Density functional theory calculations predict charge transfer from the anion to the CO2 and from CO2 to the cation. The charge transfer drives geometrical distortion of CO2, which in turn changes the ν3 frequency. The observed structural relaxation timescales vary by up to an order of magnitude between ionic liquids. Shoulders in the 2D-IR spectra arise from anharmonic coupling of the ν2 and ν3 normal modes of CO2. Thermal fluctuations in the ν2 population stochastically modulate the ν3 frequency and generate dynamic cross-peaks. These timescales are attributed to the breakup of ion cages that create a well-defined local environment for CO2. The results suggest that the picosecond dynamics of CO2 are gated by local diffusion of anions and cations.
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Affiliation(s)
- Thomas Brinzer
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, USA
| | - Eric J Berquist
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, USA
| | - Zhe Ren
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, USA
| | - Samrat Dutta
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, USA
| | - Clinton A Johnson
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, USA
| | - Cullen S Krisher
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, USA
| | - Daniel S Lambrecht
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, USA
| | - Sean Garrett-Roe
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, USA
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108
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Seo S, DeSilva MA, Xia H, Brennecke JF. Effect of Cation on Physical Properties and CO2 Solubility for Phosphonium-Based Ionic Liquids with 2-Cyanopyrrolide Anions. J Phys Chem B 2015; 119:11807-14. [PMID: 26268050 DOI: 10.1021/acs.jpcb.5b05733] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of tetraalkylphosphonium 2-cyanopyrrolide ([Pnnnn][2-CNPyr]) ionic liquids (ILs) were prepared to investigate the effect of cation size on physical properties and CO2 solubility. Each IL was synthesized in our laboratory and characterized by NMR spectroscopy. Their physical properties, including density, viscosity, and ionic conductivity, were determined as a function of temperature and fit to empirical equations. The density gradually increased with decreasing cation size, while the viscosity decreased noticeably. In addition, the [Pnnnn][2-CNPyr] ILs with large cations exhibited relatively low degrees of ionicity based on analysis of the Walden plots. This implies the presence of extensive ion pairing or formation of aggregates resulting from van der Waals interactions between the long hydrocarbon substituents. The CO2 solubility in each IL was measured at 22 °C using a volumetric method. While the anion is typically known to be predominantly responsible for the CO2 capture reaction, the [Pnnnn][2-CNPyr] ILs with shorter alkyl chains on the cations exhibited slightly stronger CO2 binding ability than the ILs with longer alkyl chains. We attribute this to the difference in entropy of reaction, as well as the variation in the relative degree of ionicity.
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Affiliation(s)
- Samuel Seo
- Department of Chemical and Biomolecular Engineering, University of Notre Dame , Notre Dame, Indiana 46556, United States
| | - M Aruni DeSilva
- Department of Chemical and Biomolecular Engineering, University of Notre Dame , Notre Dame, Indiana 46556, United States
| | - Han Xia
- Department of Chemical and Biomolecular Engineering, University of Notre Dame , Notre Dame, Indiana 46556, United States
| | - Joan F Brennecke
- Department of Chemical and Biomolecular Engineering, University of Notre Dame , Notre Dame, Indiana 46556, United States
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109
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Enszer JA, Andrei Măceș D, Stadtherr MA. Probability bounds analysis for nonlinear population ecology models. Math Biosci 2015; 267:97-108. [PMID: 26150119 DOI: 10.1016/j.mbs.2015.06.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2015] [Revised: 06/15/2015] [Accepted: 06/17/2015] [Indexed: 11/17/2022]
Abstract
Mathematical models in population ecology often involve parameters that are empirically determined and inherently uncertain, with probability distributions for the uncertainties not known precisely. Propagating such imprecise uncertainties rigorously through a model to determine their effect on model outputs can be a challenging problem. We illustrate here a method for the direct propagation of uncertainties represented by probability bounds though nonlinear, continuous-time, dynamic models in population ecology. This makes it possible to determine rigorous bounds on the probability that some specified outcome for a population is achieved, which can be a core problem in ecosystem modeling for risk assessment and management. Results can be obtained at a computational cost that is considerably less than that required by statistical sampling methods such as Monte Carlo analysis. The method is demonstrated using three example systems, with focus on a model of an experimental aquatic food web subject to the effects of contamination by ionic liquids, a new class of potentially important industrial chemicals.
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Affiliation(s)
- Joshua A Enszer
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
| | - D Andrei Măceș
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Mark A Stadtherr
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA.
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110
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Tang H, Lu D, Wu C. Intramolecular Hydrogen Bonds Enhance Disparity in Reactivity between Isomers of Photoswitchable Sorbents and CO2 : A Computational Study. Chemphyschem 2015; 16:1926-32. [PMID: 25908484 DOI: 10.1002/cphc.201500164] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 04/02/2015] [Indexed: 11/07/2022]
Abstract
Reducing the emission of greenhouse gases, such as CO2 , requires efficient and reusable capture materials. The energy for regenerating sorbents is critical to the cost of CO2 capture. Here, we design a series of photoswitchable CO2 capture molecules by grafting Lewis bases, which can covalently bond CO2 , to azo-based backbones that can switch configurations upon light stimulation. The first-principles calculations demonstrate that intramolecular hydrogen bonds are crucial for enlarging the difference of CO2 binding strengths to the cis and trans isomers. As a result, the CO2 -sorbent interaction can be light-adjusted from strong chemical bonding in one configuration to weak bonding in the other, which may lead to a great energy reduction in sorbent regeneration.
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Affiliation(s)
- Huarong Tang
- School of Materials Science and Engineering, Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University (China)
| | - Dongmei Lu
- Department of Applied chemistry, School of Science, Xi'an Jiaotong University (China).
| | - Chao Wu
- Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710054 (China).
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111
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Firaha DS, Hollóczki O, Kirchner B. Computer-Aided Design of Ionic Liquids as CO2Absorbents. Angew Chem Int Ed Engl 2015; 54:7805-9. [DOI: 10.1002/anie.201502296] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Indexed: 11/09/2022]
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112
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Firaha DS, Hollóczki O, Kirchner B. Computer-gestütztes Design ionischer Flüssigkeiten zur CO2-Absorption. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502296] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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113
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Taylor SFR, McCrellis C, McStay C, Jacquemin J, Hardacre C, Mercy M, Bell RG, de Leeuw NH. CO2 Capture in Wet and Dry Superbase Ionic Liquids. J SOLUTION CHEM 2015. [DOI: 10.1007/s10953-015-0319-z] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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114
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Gao J, Ndong RS, Shiflett MB, Wagner NJ. Creating nanoparticle stability in ionic liquid [C4mim][BF4] by inducing solvation layering. ACS NANO 2015; 9:3243-3253. [PMID: 25758381 DOI: 10.1021/acsnano.5b00354] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The critical role of solvation forces in dispersing and stabilizing nanoparticles and colloids in 1-butyl-3-methylimidazolium tetrafluoroborate [C4mim][BF4] is demonstrated. Stable silica nanoparticle suspensions over 60 wt % solids are achieved by particle surface chemical functionalization with a fluorinated alcohol. A combination of techniques including rheology, dynamic light scattering (DLS), transmission electron microscopy (TEM), and small angle neutron scattering (SANS) are employed to determine the mechanism of colloidal stability. Solvation layers of ∼5 nm at room temperature are measured by multiple techniques and are thought to be initiated by hydrogen bonds between the anion [BF4](-) and the fluorinated group on the surface coating. Inducing structured solvation layering at particle surfaces through hydrogen bonding is demonstrated as a method to stabilize particles in ionic liquids.
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Affiliation(s)
- Jingsi Gao
- †Center for Molecular and Engineering Thermodynamics, Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
| | - Rose S Ndong
- †Center for Molecular and Engineering Thermodynamics, Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
| | - Mark B Shiflett
- ‡Central Research and Development, DuPont Company, Wilmington, Delaware 19880, United States
| | - Norman J Wagner
- †Center for Molecular and Engineering Thermodynamics, Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
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115
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Pan M, Wang C. Recent Advances in CO 2Capture by Functionalized Ionic Liquids. ACS SYMPOSIUM SERIES 2015. [DOI: 10.1021/bk-2015-1194.ch014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Mingguang Pan
- Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, Hangzhou 310027, P. R. China
| | - Congmin Wang
- Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, Hangzhou 310027, P. R. China
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116
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Wang YL, Sarman S, Li B, Laaksonen A. Multiscale modeling of the trihexyltetradecylphosphonium chloride ionic liquid. Phys Chem Chem Phys 2015; 17:22125-35. [DOI: 10.1039/c5cp02586a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hierarchical trihexyltetradecylphosphonium cationic and chloride anionic models.
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Affiliation(s)
- Yong-Lei Wang
- System and Component Design
- Department of Machine Design
- KTH Royal Institute of Technology
- SE-100 44 Stockholm
- Sweden
| | - Sten Sarman
- Department of Materials and Environmental Chemistry
- Arrhenius Laboratory
- Stockholm University
- SE-106 91 Stockholm
- Sweden
| | - Bin Li
- Theoretical Chemistry
- Chemical Center
- Lund University
- SE-221 00 Lund
- Sweden
| | - Aatto Laaksonen
- Department of Materials and Environmental Chemistry
- Arrhenius Laboratory
- Stockholm University
- SE-106 91 Stockholm
- Sweden
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117
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Cui G, Huang Y, Zhang R, Zhang F, Wang J. Highly efficient and reversible SO2 capture by halogenated carboxylate ionic liquids. RSC Adv 2015. [DOI: 10.1039/c5ra09752e] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Several halogenated carboxylate ionic liquids were developed for SO2 capture. Both enhanced capacity, improved desorption, and reversibility of ionic liquids can be achieved via adding halogen sulfur interaction between halogen on the anion and SO2.
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Affiliation(s)
- Guokai Cui
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Henan Normal University
| | - Yanjie Huang
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Henan Normal University
| | - Ruina Zhang
- School of Mathematics and Information Science
- Henan Normal University
- Xinxiang
- China
| | - Fengtao Zhang
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Henan Normal University
| | - Jianji Wang
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Henan Normal University
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118
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Tang H, Lu D, Wu C. Cation-assisted interactions between N-heterocycles and CO2. Phys Chem Chem Phys 2015; 17:15725-31. [PMID: 26013920 DOI: 10.1039/c5cp01793a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Interactions between CO2 and N-heterocycles are greatly enhanced by divalent cations.
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Affiliation(s)
- Huarong Tang
- School of Materials Science and Engineering & Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) & State Key Laboratory for Mechanical Behavior of Materials
- Xi'an Jiaotong University
- Xi'an
- China
| | - Dongmei Lu
- Department of Applied Chemistry
- School of Science
- Xi'an Jiaotong University
- Xi'an
- China
| | - Chao Wu
- Frontier Institute of Science and Technology
- Xi'an Jiaotong University
- Xi'an
- China
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119
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Seo S, DeSilva MA, Brennecke JF. Physical Properties and CO2 Reaction Pathway of 1-Ethyl-3-Methylimidazolium Ionic Liquids with Aprotic Heterocyclic Anions. J Phys Chem B 2014; 118:14870-9. [PMID: 25431974 DOI: 10.1021/jp509583c] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ionic liquids (ILs) with aprotic heterocyclic anions (AHA) are attractive candidates for CO(2) capture technologies. In this study, a series of AHA ILs with 1-ethyl-3-methylimidazolium ([emim](+)) cations were synthesized, and their physical properties (density, viscosity, and ionic conductivity) were measured. In addition, CO(2) solubility in each IL was determined at room temperature using a volumetric method at pressures between 0 and 1 bar. The AHAs are basic anions that are capable of reacting stoichiometrically with CO(2) to form carbamate species. An interesting CO(2) uptake isotherm behavior was observed, and this may be attributed to a parallel, equilibrium proton exchange process between the imidazolium cation and the basic AHA in the presence of CO(2), followed by the formation of "transient" carbene species that react rapidly with CO(2). The presence of the imidazolium-carboxylate species and carbamate anion species was verified using (1)H and (13)C NMR spectroscopy. While the reaction between CO(2) and the proposed transient carbene resulted in cation-CO(2) binding that is stronger than the anion-CO(2) reaction, the reactions of the imidazolium AHA ILs were fully reversible upon regeneration at 80 °C with nitrogen purging. The presence of water decreased the CO(2) uptake due to the inhibiting effect of the neutral species (protonated form of AHA) that is formed.
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Affiliation(s)
- Samuel Seo
- Department of Chemical and Biomolecular Engineering, University of Notre Dame , Notre Dame, Indiana 46556, United States
| | - M Aruni DeSilva
- Department of Chemical and Biomolecular Engineering, University of Notre Dame , Notre Dame, Indiana 46556, United States
| | - Joan F Brennecke
- Department of Chemical and Biomolecular Engineering, University of Notre Dame , Notre Dame, Indiana 46556, United States
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120
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López-Barrón CR, Li D, Wagner NJ, Caplan JL. Triblock Copolymer Self-Assembly in Ionic Liquids: Effect of PEO Block Length on the Self-Assembly of PEO–PPO–PEO in Ethylammonium Nitrate. Macromolecules 2014. [DOI: 10.1021/ma501238w] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Carlos R. López-Barrón
- ExxonMobil
Chemical Company, Baytown Technology and Engineering Complex, Baytown, Texas 77520, United States
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