Sökning: "SiO2 activity"

Visar resultat 1 - 5 av 19 avhandlingar innehållade orden SiO2 activity.

1. 1. Thermodynamic Studies of the Fe-Pt System and “FeO”-Containing Slags for Application Towards Ladle Refining

   Detta är en avhandling från Stockholm : Materialvetenskap

   Författare :Patrik Fredriksson; KTH.; [2003]
   Nyckelord :Thermodynamics; Activity; Galvanic cell; Calorimetry; Gas equilibration technique; Iron-platinum alloys; FeO; Slags; Modelling; Ladle;

   Sammanfattning : In the present work, the thermodynamic activites of ironoxide, denoted as "FeO" in the slag systems Al2O3-"FeO", CaO-"FeO", "FeO"-SiO2, Al2O3-"FeO"-SiO2, CaO-"FeO"-SiO2and "FeO"-MgO-SiO2were investigated by employing the gasequilibration technique at steelmaking temperatures. Thestrategy was to expose the molten slag mixtures kept inplatinum crucibles for an oxygen potential, determined by aCO/CO2-ratio. LÄS MER

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

   Detta är en avhandling från Stockholm : Materialvetenskap

   Författare :Young Jo Kang; KTH.; [2007]
   Nyckelord :TEKNIKVETENSKAP; TECHNOLOGY; non-metallic inclusions; ladle refining; vacuum degassing; ladle glaze; spinel; SiO2 activity; agglomeration; cold model; open-eye; inclusion removal;

   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

4. 3. A Study of Propane and Propene Ammoxidation over the Mo-V-Nb-Te-Oxide System

   Detta är en avhandling från Chemical Engineering, Lund University

   Författare :Johan Holmberg; Lunds universitet.; Lund University.; [2006]
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEM; Kemiteknik och kemisk teknologi; TPR; XPS; XRD; XANES; Chemical technology and engineering; SEM; FTIR; BET; TiO2; SiO2; Al2O3; supports; substitution; synthesis; Mo-V-Nb-Te-Ox catalysts; acrylonitrile; propene; Ammoxidation; propane; symbiosis;

   Sammanfattning : The ammoxidation of propane is commonly regarded as being the future route for producing acrylonitrile, and the Mo-V-Nb-Te-oxide system studied here has thus far been seen as the most promising candidate for achieving this. Yields of up to 62% have been presented very elegantly in the patent literature. LÄS MER

5. 4. Measurements of the thermodynamic activities of chromium  and vanadium oxides in CaO-MgO-Al2O3-SiO2 slags

   Detta är en avhandling från Chemical Engineering, Lund University

   Författare :Pengli Dong; KTH.; [2009]
   Nyckelord :TEKNIKVETENSKAP; TECHNOLOGY; thermodynamic activity; chromium oxide; vanadium oxide; equilibrium; slags; slag basicity; gas-equilibration technique;

   Sammanfattning : In the present work, the thermodynamic activities of chromium and vanadium oxide in CaO-SiO2-MgO-Al2O3 slags were measured using gas-slag equilibration technique. The slag was equilibrated with a gas mixture of CO, CO2 and Ar gases enabling well-defined oxygen partial pressures in the gas mixture (PO2=10-3,10-4,10-5 Pa) at temperatures 1803, 1823K, 1873, 1923 K. LÄS MER

7. 5. Alkylation and Hydrodearomatization over Zeolite cCatalysts

   Detta är en avhandling från Chalmers University of Technology

   Författare :Junjun Yuan; Chalmers tekniska högskola.; Chalmers University of Technology.; Chalmers tekniska högskola.; Chalmers University of Technology.; [2005]
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; alkylation; ZSM-5 catalysts; SiO2 Al2O3 ratio; selectivity; aqueous ethanol; ethylbenzene; hydrodearomatisation; diesel fuel; Pt Y zeolite; hydrocracking; alkylation of aromatics; Acid catalysts; Brønsted acids; acidic protons; toluene; benzene; activity and selectivity; GC; diethylbenzene; hydrodearomatization; temperature; pressure; gasoline; Hydrocracking;

   Sammanfattning : .... LÄS MER