Results 221 to 230 of about 20,597 (255)
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Thermal Lensing in a Supercritical Water Medium
The Journal of Physical Chemistry A, 2006A pulsed, two-beam, thermal lensing experiment was performed to determine the concentration of aqueous solutes above the critical point of water. Despite a very significant mirage effect due to thermal gradients in the cell and absorption by water itself, the thermal lensing signal strength for aqueous benzoic acid in supercritical water was found to ...
Rene G, Rodriguez +7 more
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Structure of supercritical water
Journal of Molecular Liquids, 2001Abstract This review paper gives the more up to date information on the structure of supercritical water, at different thermodynamic states, for densities ranging from 0.2 to 0.7 g.cm−3, studied by neutron scattering. The experimental partial pair correlation functions gOH(r), GHH(r) and gOO(r) are compared with the results of molecular dynamics ...
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Hydrogen Bonded Networks in Supercritical Water
The Journal of Physical Chemistry B, 2014In this study, the structure of supercritical water (SCW) is investigated by Raman spectroscopy and molecular dynamics simulations. It was found that the hydrogen bonding in water is closely related to temperature and pressure (or water density). According to the Raman spectroscopic study of SCW, the existence of tetrahedral hydrogen bonds in SCW is ...
Qiang, Sun, Qianqian, Wang, Dongye, Ding
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Supercritical water oxidation of landfill leachate
Waste Management, 2011In this paper, ammonia as an important ingredient in landfill leachate was mainly studied. Based on Peng-Robinson formulations and Gibbs free energy minimization method, the estimation of equilibrium composition and thermodynamic analysis for supercritical water oxidation of ammonia (SCWO) was made.
Shuzhong, Wang +5 more
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Supercritical water gasification
Biofuels, Bioproducts and Biorefining, 2008AbstractThis article reviews the work relating to the supercritical water gasifi cation of biomass with a focus on hydrogen production. The high hydrogen yield predicted by thermodynamic calculations and the special properties of near‐ and supercritical water support the biomass degradation; these were the main reasons why the process of ...
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Electron-Transfer Reactions in Supercritical Water
The Journal of Physical Chemistry B, 2007Free energies and dynamics of electron-transfer reactions for a diatomic donor-acceptor complex in ambient and supercritical water are studied via molecular dynamics computer simulations using a two-state electronic description. The free energy perturbation method is employed to examine diabatic electronic curves relevant to charge separation and ...
Youngseon, Shim, Hyung J, Kim
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2010
Hydrothermal synthesis of particles is usually carried out at subcritical conditions in batch reactors. In supercritical region, reaction rate increases dramatically due to low dielectric constant (ɛ) of SCW. Therefore, fine particles (e.g., metal oxides) are rapidly synthesized (e.g., 0.4 s∼2 min) in a continuous SCW process.
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Hydrothermal synthesis of particles is usually carried out at subcritical conditions in batch reactors. In supercritical region, reaction rate increases dramatically due to low dielectric constant (ɛ) of SCW. Therefore, fine particles (e.g., metal oxides) are rapidly synthesized (e.g., 0.4 s∼2 min) in a continuous SCW process.
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Chemistry in Supercritical Water.
Angewandte Chemie (International ed. in English)Water is a special liquid-and not only under "normal" conditions. Water in the supercritical state (shaded area in the phase diagram) is distinguished by special properties which are wholly at variance with those of normal water. So far these have usually been exploited for the purification of waste water, for example for the complete oxidation of ...
, Bröll +7 more
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Decomposition of isoquinoline and quinoline by supercritical water
Journal of Hazardous Materials, 2000The ability of supercritical water (SCW) to decompose heterocyclic compounds (quinoline and isoquinoline) has been explored in this study. The results obtained suggest that water acts as a chemical reagent above its critical point (374 degrees C and 22.1 MPa).
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Chemical reactions of organic compounds in supercritical water gasification and oxidation
Water Research, 2021Ning Wei, Donghai Xu, Shuwei Guo
exaly