Sökning: "coke formation"

Visar resultat 1 - 5 av 22 avhandlingar innehållade orden coke formation.

  1. 1. Methods of studying coke formation

    Författare :Mikael Larsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hydrogen; propane dehydrogenation; platinum; coke; catalysis; catalyst deactivation; deuterium; temperature-programmed oxidation; TPO; tin; alumina;

    Sammanfattning : .... LÄS MER

  3. 2. Catalyst Deactivation by Coke Formation in Acetylene Hydrogenation

    Författare :Staffan Asplund; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; preparative liquid chromatography; gross error detection; acetylene hydrogenation; coke deposition; coke formation; catalyst deactivation;

    Sammanfattning : Several aspects of catalyst deactivation have been studied with reference toselective acetylene hydrogenation, a reaction used industrially to purify ethylene from unwanted acetylene. A mathematical model has been developed for an industrial packed-bed reactor, employing a supported Pd catalyst. LÄS MER

  4. 3. Coke on Supported Palladium and Platinum Catalysts

    Författare :Mikael Larsson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TPO; palladium; deactivation; coke; propane dehydrogenation; microbalance; vegetable oil hydrogenation; acetylene hydrogenation; catalysis; platinum;

    Sammanfattning : Catalyst deactivation by coke formation has been investigated in three heterogeneous catalytic processes, propane dehydrogenation, acetylene hydrogenation and hydrogenation of vegetable oil. Palladium and/or platinum supported on alumina were used as catalysts in all reactions. LÄS MER

  5. 4. Co-injection of basic fluxes or BF flue dust with PC into a BF charged with 100% pellets : effects on slag formation and coal combustion

    Författare :Lena Sundqvist Ökvist; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Process Metallurgy; Processmetallurgi;

    Sammanfattning : Based on 100% pellets operation at BF No. 3 at SSAB Tunnplåt in Luleå a new pellet with CaO/SiO2=1 was developed during early nineties. The pellet showed good results in metallurgical laboratory test but caused slag formation problems in the bosh. LÄS MER

  7. 5. Catalyst Deactivation by Coke Formation. A Study of the Carbonaceous Layer on a Used Hydrogenation Catalyst

    Författare :Åsa Wrammerfors; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The carbonaceous layer, formed on a Ni/SiO2 catalyst, and its influence on the selectivity in a hydrogenation reaction have been studied. The model reaction system studied was the consecutive hydrogenation of 2-ethyl-hexenal: Exposure of the catalyst to 2-ethyl-hexenal or cyclopentadiene at elevated temperatures before the hydrogenation, yielded an increased selectivity toward the formation of 2-ethyl-hexanal. LÄS MER