Search results for "High temperature water"

showing 6 items of 6 documents

Physico-chemical characterization of passive films on 316L stainless steel grown in high temperature water

2014

Physico-chemical characterization passive films on 316L stainless steel high temperature water nuclear pressurized water reactor photoelectrochemistry electrochemical impedance spectroscopySettore ING-IND/23 - Chimica Fisica Applicata
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Photoelectrochemical Characterization of Oxide Layers on 316L Stainless Steel Grown in High temperature Water

2014

Settore ING-IND/23 - Chimica Fisica ApplicataPhotoelectrochemical Characterization Oxide Layers on 316L Stainless Steel High temperature Water Nuclear Pressurized Water Reactor Corrosion
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Optimisation of metallic interconnects for hydrogen production by high temperature water vapour electrolysis (HTVE)

2012

The high temperature water vapour electrolysis offers a promising method for highlyefficient hydrogen production. It works as an inverse solid oxide fuel cell, using water vapourand electricity in order to produce hydrogen. A major technical difficulty related to hightemperature water vapour electrolysis (HTVE) is the development of interconnects workingefficiently on a long period. From the electrical point of view, the interconnect must have alow contact resistance with the electrodes. Indeed, it directly affects the electrochemicalconversion efficiency (water into hydrogen) and it can penalize the process. The interconnectmust present a slow oxidation kinetics and form as less as possibl…

[SPI.OTHER]Engineering Sciences [physics]/Other[ SPI.OTHER ] Engineering Sciences [physics]/OtherHigh temperature corrosionVapeur d’eau[SPI.OTHER] Engineering Sciences [physics]/OtherInterconnecteurs métalliquesMarking experimentsWater vapourHigh temperature water vapour electrolysisMetallic interconnectASR[CHIM.OTHE] Chemical Sciences/Other[ CHIM.OTHE ] Chemical Sciences/OtherCorrosion haute températureMarquage isotopiqueElectrolyse de la vapeur d’eau à haute température[CHIM.OTHE]Chemical Sciences/Other
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Thermomineral waters of Greece: geochemical characterization

2020

75 °C). In terms of pH most results vary from 5.5 to 823 °C) ii) warm (23 40 °C) iii) thermal (40 75 °C) and iv) hyperthermal (&gtfew springs show either very low pH (&lt10) proposing serpentinization processes. Regarding TDS concentrations collected waters can be subdivided into low salinity (up to 1.5 g/L) brackish (up to 20 g/L) and saline (up to 43 g/L). The medium high salinities can be justified by mixing with sea water and/or strong waterrock interaction processes. Isotope composition of O and H ranges from 12.7 to +2.7 ‰ SMOW and from 91 to +12 ‰ SMOW respectively and is generally comprised between the Global Meteoric Water Line and the East Mediterranean Meteoric Water Line. Only few water samples show a positive shift for δ18O possibly related to high temperature waterrock interaction processes. Carbon dioxide (18 997000 μmol/mol) or N2 (1100 989000 μmol/mol) or CH4 (&ltMany geothermal areas of Greece are located in regions affected by Miocene or Quaternary volcanism and in continental basins characterised by elevated heat flow. Moreover the majority of them is found along the coast as well as in islands of the Aegean Sea and thus thermal water is often brackish to saline due to marine intrusion into costal aquifer. In the present study almost 300 thermal and cold mineral water samples were collected along the Hellenic territory with their physicochemical parameters (temperature pH electrical conductivity and Eh) and the amount of bicarbonates (titration with 0.1N HCl) being determined in situ. Additionally gases found either in free or dissolved phase were sampled. Both water and gas samples were analysed at the INGVPa laboratories for major ions (Ion Chromatography) silica (Inductively Coupled Plasma Optical Emission Spectrometry) chemical composition of free and dissolved gases (Gas Chromatography) water isotopes (O and H) and carbon and helium isotopes of free and dissolved gases (Mass Spectrometry). The temperature of the investigated waters ranges from 6.5 to 98°C pH from 1.96 to 11.98 whilst Total Dissolved Solids (TDS) from 0.06 to 43 g/L. Based on the temperature parameter waters can be divided into four groups: i) cold (&lt0.5 913000 μmol/mol) are the prevailing gas species found in the studied sites. The δ13CCO2 values ranged from 20.1 to +8.5 ‰ whilst the isotope ratio of He from 0.21 to 6.71 R/RA.4) suggesting interaction with H2Srich gases or very high pH values (&gtSettore GEO/08 - Geochimica E Vulcanologia
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Easy Method for the Transformation of Levulinic Acid into Gamma-Valerolactone Using a Nickel Catalyst Derived from Nanocasted Nickel Oxide

2019

Different nickel catalysts have been tested for the transformation of levulinic acid into &gamma

inorganic chemicalsMaterials scienceHydrogenValerolactonechemistry.chemical_element02 engineering and technology010402 general chemistrylcsh:Technology01 natural sciencesArticleHydrothermal circulationCatalysischemistry.chemical_compoundLevulinic acidNickelotorhinolaryngologic diseasesLevulinic acidheterocyclic compoundsGeneral Materials ScienceNanocastinglcsh:Microscopylcsh:QC120-168.85lcsh:QH201-278.5lcsh:Torganic chemicalsNickel oxideNon-blocking I/O021001 nanoscience & nanotechnology0104 chemical sciencesgamma-ValerolactoneNickelHydrothermal reactionChemical engineeringchemistrylcsh:TA1-2040lcsh:Descriptive and experimental mechanicslcsh:Electrical engineering. Electronics. Nuclear engineeringHigh temperature waterlcsh:Engineering (General). Civil engineering (General)0210 nano-technologylcsh:TK1-9971Materials
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Photoelectrochemical and XPS Characterization of Passive films Grown on 316L Stainless Steel in High Temperature Water

2015

One of the major materials challenge for continued safe, reliable and cost-effective utilization of watercooled nuclear reactors for electricity production is development of improved understanding of the synergistic fundamental mechanisms responsible for corrosion and stress corrosion cracking degradation of austenitic steels and nickel base alloys

Settore ING-IND/23 - Chimica Fisica ApplicataPhotoelectrochemical and XPS Characterization Passive films 316L Stainless Steel High Temperature Water
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