Sökning: "dissolution kinetics"

Visar resultat 1 - 5 av 36 avhandlingar innehållade orden dissolution kinetics.

  1. 1. Radiation Induced Oxidative Dissolution of UO2

    Detta är en avhandling från Stockholm : KTH

    Författare :Ella Ekeroth; KTH.; [2006]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; radiation; radiolysis; UO2; spent nuclear fuel; radicals; oxidants; reductants; rate constants; dissolution; H2O2; H2; TECHNOLOGY Chemical engineering Chemical process and manufacturing engineering Nuclear chemistry; TEKNIKVETENSKAP Kemiteknik Kemisk process- och produktionsteknik Kärnkemi;

    Sammanfattning : SammanfattningDenna doktorsavhandling berör oxidativ upplösning av UO2 (som modellsubstans för utbränt kärnbränsle) orsakad av radiolys av vatten samt effekten av H2 på denna denna process.Hastighetskonstanter för oxidation av UO2-pulver med olika oxidanter såsom H2O2 har bestämts experimentellt. LÄS MER

  2. 2. Chlorite: Geochemical properties, Dissolution kinetcis and Ni(II) sorption

    Detta är en avhandling från Stockholm : KTH

    Författare :Åsa Zazzi; KTH.; [2009]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; chlorite; dissolution kinetics; Ni II sorption; surface complexation; MEDICINE Chemistry; MEDICIN Kemi;

    Sammanfattning : In Sweden, among other countries, a deep multi-barrier geological repository, KBS-3, is planned for the burial of nuclear waste. One of the barriers is identified as the grantic bedrock itself and in this environment chlorite is present at surfaces in fracture zones. LÄS MER

  3. 3. Effects of HCO3- and ionic strength on the oxidation and dissolution of UO2

    Detta är en avhandling från Stockholm : KTH

    Författare :Mohammad Moshin Hossain; KTH.; [2006]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; UO2; H2O2; spent nuclear fuel; HCO3-; ionic strength; oxidation; dissolution; surface site density.; NATURAL SCIENCES Chemistry; NATURVETENSKAP Kemi;

    Sammanfattning : The kinetics for radiation induced dissolution of spent nuclear fuel is a key issue in the safety assessment of a future deep repository. Spent nuclear fuel mainly consists of UO2 and therefore the release of radionuclides (fission products and actinides) is assumed to be governed by the oxidation and subsequent dissolution of the UO2 matrix. LÄS MER

  4. 4. Investigations of the Kinetics of Reduction and Reduction/Carburization of NiO-WO3 Precursors

    Detta är en avhandling från Stockholm : KTH

    Författare :Hesham M. Ahmed; KTH.; [2010]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TECHNOLOGY Chemical engineering Metallurgical process and manufacturing engineering Metallurgical process engineering; TEKNIKVETENSKAP Kemiteknik Metallurgisk process- och produktionsteknik Metallurgisk processteknik; Reduction; Reduction-Carburization; Gas-solid Reactions; Kinetics; Hydrogen; Methane; Thermogravimetric analysis; Fluidized bed; Simulation; Thermal diffusivity; Thermal conductivity; Laser flash; Process Metallurgy; Processmetallurgi;

    Sammanfattning : Kinetic studies of reduction of the mixtures of NiO and WO3 having different Ni/(Ni+W) molar ratios in flowing hydrogen gas were investigated by means of Thermo Gravimetric Analysis (TGA), Fluidized Bed (FB) technique as well as Thermal diffusivity measurements under isothermal conditions. In the case of TGA, the reaction progress was monitored by mass loss, while evolved gas analysis by a gas chromatograph was the indicator of the reaction progress in the case of FB. LÄS MER

  5. 5. Formation and Decomposition of Platinum–Thallium Bond, Kinetics and Mechanism. Structural Characterization of Some Metal Cyanides in the Solid State

    Detta är en avhandling från Stockholm : Kemi

    Författare :Péter Nagy; KTH.; [2004]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; metal–metal bond; platinum; thallium; kinetics; mechanism; stopped flow; oxidative addition; cyano complexes; edta; redox reaction; metal cyanides; X–ray diffraction; Raman; NMR; mercury; palladium; nickel; one dimensional wire;

    Sammanfattning : The kinetic and mechanistic features of a new series ofplatinum-thallium cyano compounds containing a direct andunsupported by ligands metal-metal bond have been studied insolution, using standard mix–and–measurespectrophotometric technique and stopped–flow method.These reactions are interpreted as oxidative addition of the cspecies to the square planar Pt(CN)42-complex. LÄS MER