Sökning: "Al2O3"

Visar resultat 16 - 20 av 327 avhandlingar innehållade ordet Al2O3.

  1. 16. Influence of total pressure on complete oxidation of methane over Pd/Al2O3 catalysts

    Författare :Carl-Robert Florén; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Pd Al2O3; methane oxidation; multiscale flow-reactor model; total pressure;

    Sammanfattning : Natural gas and biogas, which have methane as their main component, are interesting choices of fuel to reduce the anthropogenic emissions of greenhouse gases. However, as methane is a greenhouse gas, uncombusted methane should be removed from the combustion gases. Emission control catalysts can preferably be used to completely oxidise methane. LÄS MER

  3. 17. Structure and energetics of kappa alumina (-Al2O3) calculated from first principles

    Författare :Yashar Yourdshahyan; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; electronic properties; structure; plane-waves; local-density-approximation; stability; ceramics materials; Al2O3 K-phase; pseudopotentials; density-functional theory;

    Sammanfattning : .... LÄS MER

  4. 18. Some aspects of non-metallic inclusions during vacuum degassing in ladle treatment : with emphasize on liquid CaO-Al2O3 inclusions

    Författare :Young Jo Kang; Du Sichen; Takahiro Miki; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; non-metallic inclusions; ladle refining; vacuum degassing; ladle glaze; spinel; SiO2 activity; agglomeration; cold model; open-eye; inclusion removal; Metallurgical process engineering; Metallurgisk processteknik;

    Sammanfattning : The present thesis was to study non-metallic inclusions during vacuum degassing in ladle treatment. Emphasize was mostly given to liquid CaO-Al2O3 inclusions. A series of industrial experiments were carried out at Uddeholm Tooling AB, Hagfors, Sweden. To gain an insight into the industrial findings, laboratory investigations were also performed. LÄS MER

  5. 19. The microstructure of chemically vapour deposited AL2O3 coatings

    Författare :Mats Halvarsson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; microstructure; alpha; phase transformation; cemented carbides; multilayers; -Al2< sub>O3< sub>; CVD; kappa; TEM; -Al2< sub>O3< sub>;

    Sammanfattning : .... LÄS MER

  7. 20. Thermodynamic study of the FeO-MgO-Al2O3-SiO2 system : Data assessment and phase diagram calculation

    Författare :Olga Fabrichnaya; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Geovetenskap; Earth sciences; Geovetenskap; mineralogi; petrologi och tektonik; Mineral Chemistry; Petrology and Tectonics;

    Sammanfattning : This dissertation consists of assessed thermodynamic properties for phases in the geologically and industrially important system Fe-Mg-Al-Si-O and calculated phase diagrams. Mathematical processing of different kinds of experimental data (phase equilibrium data, calorimetric, volumetric, thermophysical,electrochemical, activity data) is used to derive internally consistent thermodynamic database. LÄS MER