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Alkali metal chlorides in DMSO–methanol binary mixtures: insights into the structural properties through molecular dynamics simulations. Theor Chem Acc 2021. [DOI: 10.1007/s00214-021-02856-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Keshri S, Tembe B. Ion association in binary mixtures of water-CO2 in supercritical conditions through classical molecular dynamics simulations. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.02.052] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Keshri S, Tembe BL. Structural and Dynamical Properties of Alkaline Earth Metal Halides in Supercritical Water: Effect of Ion Size and Concentration. J Phys Chem B 2017; 121:10543-10555. [DOI: 10.1021/acs.jpcb.7b07690] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sonanki Keshri
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - B. L. Tembe
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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Keshri S, Mandal R, Tembe B. Solvation structures and dynamics of alkaline earth metal halides in supercritical water: A molecular dynamics study. Chem Phys 2016. [DOI: 10.1016/j.chemphys.2016.08.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Keshri S, Sarkar A, Tembe BL. Molecular Dynamics Simulation of Na+–Cl– Ion-Pair in Water–Methanol Mixtures under Supercritical and Ambient Conditions. J Phys Chem B 2015; 119:15471-84. [DOI: 10.1021/acs.jpcb.5b05401] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sonanki Keshri
- Department
of Chemistry, Indian Institute of Technology, Bombay, Powai, Mumbai, 400076, India
| | - Atanu Sarkar
- Department
of Chemistry, Indian Institute of Technology, Bombay, Powai, Mumbai, 400076, India
| | - B. L. Tembe
- Department
of Chemistry, Indian Institute of Technology, Bombay, Powai, Mumbai, 400076, India
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Keshri S, Sarkar A, Tembe B. Molecular dynamics simulations of Na+-Cl− ion-pair in supercritical methanol. J Supercrit Fluids 2015. [DOI: 10.1016/j.supflu.2015.04.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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7
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Cauët E, Bogatko SA, Bylaska EJ, Weare JH. Ion Association in AlCl3 Aqueous Solutions from Constrained First-Principles Molecular Dynamics. Inorg Chem 2012; 51:10856-69. [DOI: 10.1021/ic301346k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Emilie Cauët
- Department of Chemistry and
Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Stuart A. Bogatko
- Department of Chemistry and
Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Eric J. Bylaska
- Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington
99352, United States
| | - John H. Weare
- Department of Chemistry and
Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
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Temperature and density effects on structural features of a dilute aqueous lithium chloride solution at near- and supercritical conditions. J Mol Liq 2011. [DOI: 10.1016/j.molliq.2011.04.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Effect of temperature and pressure on structural self-organization of aqueous sodium chloride solutions. J Mol Liq 2010. [DOI: 10.1016/j.molliq.2009.05.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Kruse A, Dinjus E. Influence of Salts During Hydrothermal Biomass Gasification: The Role of the Catalysed Water-Gas Shift Reaction. ACTA ACUST UNITED AC 2009. [DOI: 10.1524/zpch.219.3.341.59177] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
Near-critical and supercritical water is an unusual reaction medium with extraordinary properties, varying with temperature and density. This opens the opportunity for new reactions and new technical processes. In the studies of synthesis reactions, total oxidation and biomass gasification interesting effects of salts are observed. These effects are assumed to be caused by complex formation, acidity/basicity or the presence of active hydrogen due to the water-gas shift reaction. The water-gas shift reaction is catalysed by salts and lead to the formation of hydrogen, which might react with other compounds.
This article focuses on the salt effects during hydrogen production by biomass gasification in supercritical water. This is a very interesting process to make use of “wet biomass”, which is up to now not applied in a technical process. Here salts influenced the main reactions pathways. Possible reasons are discussed.
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Fedotova MV. Structural features of concentrated aqueous NaCl solution in the sub- and supercritical state at different densities. J Mol Liq 2008. [DOI: 10.1016/j.molliq.2008.04.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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12
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Molecular-Based Modeling of Water and Aqueous Solutions at Supercritical Conditions. ADVANCES IN CHEMICAL PHYSICS 2007. [DOI: 10.1002/9780470141687.ch3] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
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Fedotova MV. Special features of structure formation of sodium chloride concentrated aqueous solution on its passing to supercritical state. RUSS J GEN CHEM+ 2006. [DOI: 10.1134/s1070363206120097] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Chialvo AA, Cummings PT, Kalyuzhnyi YV. Solvation effect on kinetic rate constant of reactions in supercritical solvents. AIChE J 2006. [DOI: 10.1002/aic.690440315] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Wojciechowski IA, Sun S, Szakal C, Winograd N, Garrison BJ. Ion Emission from Water Ice Due to Energetic Particle Bombardment. J Phys Chem A 2004. [DOI: 10.1021/jp0373696] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Igor A. Wojciechowski
- Department of Chemistry, 152 Davey Laboratory, Materials Research Institute, 184 MRI Building, Penn State University, University Park, Pennsylvania 16802
| | - Shixin Sun
- Department of Chemistry, 152 Davey Laboratory, Materials Research Institute, 184 MRI Building, Penn State University, University Park, Pennsylvania 16802
| | - Christopher Szakal
- Department of Chemistry, 152 Davey Laboratory, Materials Research Institute, 184 MRI Building, Penn State University, University Park, Pennsylvania 16802
| | - Nicholas Winograd
- Department of Chemistry, 152 Davey Laboratory, Materials Research Institute, 184 MRI Building, Penn State University, University Park, Pennsylvania 16802
| | - Barbara J. Garrison
- Department of Chemistry, 152 Davey Laboratory, Materials Research Institute, 184 MRI Building, Penn State University, University Park, Pennsylvania 16802
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Sherman DM, Collings MD. Ion association in concentrated NaCI brines from ambient to supercritical conditions: results from classical molecular dynamics simulations. GEOCHEMICAL TRANSACTIONS 2002; 3:102. [PMID: 35412762 PMCID: PMC1475619 DOI: 10.1186/1467-4866-3-102] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2002] [Accepted: 11/18/2002] [Indexed: 05/11/2023]
Abstract
Highly concentrated NaCl brines are important geothermal fluids; chloride complexation of metals in such brines increases the solubility of minerals and plays a fundamental role in the genesis of hydrothermal ore deposits. There is experimental evidence that the molecular nature of the NaCl-water system changes over the pressure-temperature range of the Earth's crust. A transition of concentrated NaCl-H2O brines to a "hydrous molten salt" at high P and T has been argued to stabilize an aqueous fluid phase in the deep crust. In this work, we have done molecular dynamic simulations using classical potentials to determine the nature of concentrated (0.5-16 m) NaCl-water mixtures under ambient (25°C, 1 bar), hydrothermal (325°C, 1 kbar) and deep crustal (625°C, 15 kbar) conditions. We used the well-established SPCE model for water together with the Smith and Dang Lennard-Jones potentials for the ions (J. Chem. Phys., 1994, 100, 3757). With increasing temperature at 1 kbar, the dielectric constant of water decreases to give extensive ion-association and the formation of polyatomic (Na n Cl m ) n-m clusters in addition to simple NaCl ion pairs. Large polyatomic (Na n Cl m ) n-m clusters resemble what would be expected in a hydrous NaCl melt in which water and NaCl were completely miscible. Although ion association decreases with pressure, temperatures of 625°C are not enough to overcome pressures of 15 kbar; consequently, there is still enhanced Na-Cl association in brines under deep crustal conditions.
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Affiliation(s)
- David M Sherman
- Department of Earth Sciences, University of Bristol Bristol BS8 1RJ, UK
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Chialvo AA, Cummings PT, Simonson JM. H3O+/Cl− ion-pair formation in high-temperature aqueous solutions. J Chem Phys 2000. [DOI: 10.1063/1.1314869] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Peslherbe GH, Ladanyi BM, Hynes JT. Free Energetics of NaI Contact and Solvent-Separated Ion Pairs in Water Clusters. J Phys Chem A 2000. [DOI: 10.1021/jp993641t] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gilles H. Peslherbe
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and Department of Chemistry and Biochemistry, Concordia University, Montréal, Québec, Canada H3G 1M8
| | - Branka M. Ladanyi
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and Department of Chemistry and Biochemistry, Concordia University, Montréal, Québec, Canada H3G 1M8
| | - James T. Hynes
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, and Department of Chemistry and Biochemistry, Concordia University, Montréal, Québec, Canada H3G 1M8
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Marti J. Dynamic properties of hydrogen-bonded networks in supercritical water. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 2000; 61:449-456. [PMID: 11046284 DOI: 10.1103/physreve.61.449] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/1999] [Revised: 08/31/1999] [Indexed: 05/23/2023]
Abstract
Dynamic properties of supercritical water at temperatures between 573 and 773 K and densities between 0.49 and 0.83 g/cm(3) have been investigated by molecular dynamics simulation and compared to states located on the vapor-liquid coexistence curve. A flexible simple point charge potential has been assumed for interactions in the subcritical states, whereas a reparameterization of that model has been performed to model the supercritical states. The hydrogen bonding structure and the diffusion coefficients in an ensemble of simulated states were previously analyzed and a good agreement with available experimental data was found. Dynamic properties of hydrogen bonding like the bond lifetimes and the influence of hydrogen bonds in the vibrational spectra are discussed along a range of simulation conditions. A nonlinear behavior of the hydrogen-bond lifetime as a function of temperature is observed in subcritical water whereas a linear dependence is found in supercritical water. Special attention is paid to the intermolecular vibrational spectrum (10-400 cm(-1)). It has been observed that the mode centered at 200 cm(-1), attributed to the intermolecular O-O stretching vibration in the ambient state remains active in the supercritical states.
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Affiliation(s)
- J Marti
- Departament de Fisica i Enginyeria Nuclear, Universitat Politecnica de Catalunya, B5-206 Campus Nord, 08034 Barcelona, Catalonia, Spain* and Department of Chemistry, University of California, Berkeley, California 94720-1460, U
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Martı́ J. Analysis of the hydrogen bonding and vibrational spectra of supercritical model water by molecular dynamics simulations. J Chem Phys 1999. [DOI: 10.1063/1.478593] [Citation(s) in RCA: 199] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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23
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Chialvo AA, Cummings PT, Simonson JM, Mesmer RE. Solvation in high-temperature electrolyte solutions. I. Hydration shell behavior from molecular simulation. J Chem Phys 1999. [DOI: 10.1063/1.478150] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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