Sökning: "catalyst immobilization"

Visar resultat 1 - 5 av 13 avhandlingar innehållade orden catalyst immobilization.

  1. 1. Near field immobilization of selenium oxyanions

    Detta är en avhandling från Stockholm : KTH

    Författare :Anders Puranen; KTH.; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Se-79; Selenium; Immobilization; Redox; Iron; Corrosion; Palladium; Catalyst; Spent Nuclear Fuel; Repository; TECHNOLOGY Chemical engineering Chemical process and manufacturing engineering Nuclear chemistry; TEKNIKVETENSKAP Kemiteknik Kemisk process- och produktionsteknik Kärnkemi;

    Sammanfattning : The topic of this doctoral thesis is the potential near field immobilization of the radionuclide 79Se after intrusion of groundwater into a spent nuclear fuel canister in a repository. 79Se is a non naturally occurring long lived selenium isotope formed as a result of fission in nuclear fuel. LÄS MER

  2. 2. Flavins as Biomimetic Catalysts for Sulfoxidation by H2O2 Catalyst Immobilization in Ionic Liquid for H2O2 Oxidations

    Detta är en avhandling från Stockholm : Institutionen för organisk kemi

    Författare :Auri Lindén; Stockholms universitet.; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; biomimetic; oxidation; catalysis; ionic liquid; hydrogen peroxide; NATURAL SCIENCES Chemistry Organic chemistry; NATURVETENSKAP Kemi Organisk kemi;

    Sammanfattning : This thesis deals with the development of catalytic oxidation reactions utilizing hydrogen peroxide as terminal oxidant. The main focus has been to find flavin catalysts that are easy to handle and stable to store but still able to perform the desired reaction. LÄS MER

  3. 3. Mononuclear Ruthenium Complexes that Catalyze Water to Dioxgen Oxidation

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Lianpeng Tong; KTH.; [2012]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ruthenium complex; Homogeneous catalysis; Water oxidation; O2 evolution; anionic ligand; Molecular catalyst; Electrocatalysis; Kinetics; Artificial photosynthesis; Light-driven; Immobilization of catalyst;

    Sammanfattning : The theme of this thesis is the development of mononuclear Ru-based complexes that are capable of catalyzing the water oxidation (or O2-evolving) reaction, e.g. 2 H2O → O2 + 4 H+ + 4 e−. Several families of mononuclear Ru water oxidation catalysts were designed and prepared. LÄS MER

  4. 4. Development of Biomimetic Catalytic Systems for Selective Oxidations with H2O2 and O2

    Detta är en avhandling från Department of Organic Chemistry

    Författare :Mikael Johansson; Stockholms universitet.; [2008]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biomimetic oxidations; catalyst immobilization; dihydroxylation; sulfoxidation; flavin; NATURAL SCIENCES Chemistry; NATURVETENSKAP Kemi; Organic Chemistry; organisk kemi;

    Sammanfattning : Four different catalytic systems were studied for biomimetic coupled oxidations using H2O2 or O2. In the first example, osmium tetroxide works as a substrate-selective catalyst for dihydroxylation of olefins. Electron transfer to H2O2 is facilitated by electron transfer mediators (ETMs). LÄS MER

  5. 5. Control of enzyme activity and stability in nonaqueous media

    Detta är en avhandling från Angeliki Öste Triantafyllou, Dept. of Biotechnology, Lund University, Box 124, 221 00 Lund, Sweden

    Författare :Angeliki Öste Triantafyllou; [1996]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; polyacrylamide; polar solvent; lyophilization; immobilization; enzymes in nonaqueous media; differential scanning calorimetry; celite; additives; buffers; salts; sorbitol; Biotechnology; Bioteknik;

    Sammanfattning : The use of enzymes in nonaqueous media has considerably expanded their potential areas of application. Limitations however arise that are inherent to the low conformational flexibility of enzymes in dry organic media. Enzyme activity is often unfavorably low due to kinetic barriers. LÄS MER