Sökning: "lanthanum"

Visar resultat 1 - 5 av 37 avhandlingar innehållade ordet lanthanum.

  1. 1. Preparation and characterization of perovskite structure lanthanum gallate and lanthanum aluminate based oxides

    Författare :Shuai Li; Bill Bergman; Mogens Mogensen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Lanthanum gallate; lanthanum aluminate; ceria; composite; solid oxide fuel cell; electrolyte; polymer complexing.; Functional materials; Funktionella material;

    Sammanfattning : The present work was initiated to study the synthesis and properties of lanthanum gallate based oxides as intermediate temperature electrolyte for solid oxide fuel cells. The wet chemical method, polymer complexing route, was used to prepare the precursor powders. LÄS MER

  3. 2. Catalytic combustion of methane

    Författare :Philippe Thevenin; KTH; []
    Nyckelord :catalytic combustion; gas turbine; methane; palladium; alumina; barium; lanthanum; oxidation; preparation; temperature-programmed oxidation TPO ; decomposition; reoxidation; X-ray photoelectron spectroscopy XPS ; metal-support interaction; deactiva;

    Sammanfattning : Catalytic combustion is an environmentally benign technologywhich has recently reached the stage of commercialization.Palladium is the catalyst of choice when considering gasturbines fuelled with natural gas because of its superioractivity for methane oxidation. LÄS MER

  4. 3. Activation and inhibition of diiron and iron-manganese ribonucleotide reductases

    Författare :Ana Popović-Bijelić; Astrid Gräslund; Anders Hofer; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; class Ic; C. trachomatis; cytotoxicity; KP772; lanthanum; manganese–iron cofactor; metal complex; oligopeptide inhibitor; ribonucleotide reductase; Triapine; tyrosyl radical; Biophysics; biofysik;

    Sammanfattning : Ribonucleotide reductase (RNR) catalyses the reduction of ribonucleotides to deoxyribonucleotides. In conventional class I RNRs the active site is located in the R1 subunit, and the R2 subunit contains a diiron cofactor and a stable tyrosyl radical essential for activity. LÄS MER

  5. 4. Mixed metal oxide - noble metal catalysts for total oxidation of volatile organic compounds and carbon monoxide

    Författare :Magali Ferrandon; KTH; []
    Nyckelord :wood combustion; catalysts; total oxidation; manganese; copper; platinum; palladium; lanthanum; cerium; CO; VOC; methane; deactivation; thermal stability; sulphur dioxide;

    Sammanfattning : CO, volatile organic compounds, and polyaromatics areubiquitous air pollutants that give rise to deleterious healthand environmental effects. Such compounds are emitted, forinstance, by the combustion of wood, particularly fromsmall-scale heating appliances. LÄS MER

  7. 5. Investigation of La promoted Pd/BEA Performance for Passive NOx adsorption processes

    Författare :Rojin Feizie Ilmasani; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NO TPD; Ceria; Zirconium; Lanthanum; Pd BEA; PNA; CO effect;

    Sammanfattning : Lean-burn combustion engines have been used to improve fuel efficiency by reducing fuel consumption. However, these engines face challenges in lean reduction of NOx for exhaust after-treatment systems. LÄS MER