Sökning: "Multi-step Reactions"

Visar resultat 6 - 10 av 15 avhandlingar innehållade orden Multi-step Reactions.

  1. 6. Arene Iron Complexes in Organic Synthesis. New Routes to Benzophenones, Diaryl Selenides, Xanthones and Thioxanthones

    Författare :J Peter Storm; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Directed remote Metalation; nucleophilic aromatic addition; nucleophilic aromatic substitution; Arene-iron complexes; balanol; Organic chemistry; Organisk kemi;

    Sammanfattning : A multi-step route to unsymmetrically substituted benzophenones based on cationic hapto6-arene-hapto5-cyclopentadienyl iron complexes has been developed. The key features are nucleophilic aromatic substitution reactions performed on hapto6-2-chlorocarbomethoxybenzene-hapto5-cyclopentadienyl iron hexafluorophosphate with phenoxides, followed by intramolecular Friedel-Crafts ring-closure. LÄS MER

  3. 7. CFD Modeling of Combustion in Flexi-Fuel Burners at Gas Turbine Conditions

    Författare :Abdallah Abou-Taouk; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SAS-SST; Global reaction mechanism; CFD; LES; RANS; Combustion; PSR; Chemistry;

    Sammanfattning : The main source of energy in the nearest future will come from fossil fuels. Increasing demands on environmentally friendly energy conversion implies that pollutants, such as CO and NOx, need to be reduced. LÄS MER

  4. 8. Molecular sieve film catalysts

    Författare :Olov Öhrman; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical Technology; Kemisk teknologi;

    Sammanfattning : In this study, well defined ZSM-5 films were prepared on monoliths, ceramic foams, alumina beads, glass beads and crushed quartz glass by further refinement of a method originally developed at the division of Chemical Technology, Luleå University of Technology. The supports were seeded with silicalite-1 seeds and hydrothermally treated, either at 75 °C or at 150 °C in a single or several steps. LÄS MER

  5. 9. Mesoporous transition metal oxides for oxygen electrocatalysis in energy conversion technologies

    Författare :Zhixing Wu; Emma Björk; Magnus Odén; Mikhail Vagin; Freddy Kleitz; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Electrocatalysis, the foundation of electrical to chemical energy transformation, enables the mitigation of the electrical energy losses during reactions and the control of selectivity of the process to certain chemical products. The slow rate and the multi-step complexity of oxygen-associated reactions, namely oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), motivate the use of platinum group metals (PGM) catalysts, which significantly increase the price of the technologies due to the cost and scarcity of PGM-based materials. LÄS MER

  7. 10. Formation and Function of Low-Friction Tribofilms

    Författare :Harald Skiöld Nyberg; Staffan Jacobson; Allan Matthews; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; tribology; tribofilm; PVD; coating; low-friction; tungsten disulphide; transition metal dichalcogenide; tribochemistry; Teknisk fysik med inriktning mot tribomaterial; Engineering Science with specialization in Tribo Materials;

    Sammanfattning : The use of low-friction coatings on machine elements is steadily increasing, and they are expected to play an important role in the reduction of fuel consumption of future motorized vehicles. Many low-friction coatings function by transformation of the outermost coating layer into tribofilms, which then cover the coating surface and its counter surface. LÄS MER