Search for dissertations about: "Metal oxide catalysts"

Showing result 21 - 25 of 74 swedish dissertations containing the words Metal oxide catalysts.

  2. 21. Mechanistic Insights into Transition Metal Oxide Catalyzed Water Oxidation

    Author : Michael Busch; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; water oxidation; density functional theory; electrochemistry; water splitting; catalysis; water oxidation;

    Abstract : A binuclear mechanism was proposed and evaluated by means of Density Functional Theory calculations. The central reaction steps were found to be the oxidation of the transition metal TM-OH moieties to TM=O and the subsequent intramolecular O-O bond formation between two TM=O groups. READ MORE

  4. 22. Transition metal ion-chelating ordered mesoporous carbons as noble metal-free fuel cell catalysts

    Author : Johanna Dombrovskis; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; mesoporous materials; electrocatalysis; EXAFS spectroscopy; fuel cell; transition metals; carbon;

    Abstract : Polymer electrolyte membrane fuel cells offer promising possibilities for clean and efficient chemical to electrical energy conversion, though their high price makes them financially unappealing. This is to a large part due to the high cost of the noble metal catalyst used in fuel cells, which makes development of new, cheap and active catalyst materials necessary. READ MORE

  5. 23. Evaluating Cathode Catalysts in the Polymer Electrolyte Fuel Cell

    Author : Henrik Ekström; Göran Lindbergh; Anders Lundblad; Anthony Kucernak; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; fuel cell; humidity; model electrodes; Nafion; oxygen reduction; PEMFC; platinum; polymer electrolyte; thin film evaporation; titanium oxide; bränslecell; fuktighet; modellelektroder; Nafion; PEMFC; platina; polymerelektrolyt; syrereduktion; tunnfilmsförångning; titanoxid; Electrochemistry; Elektrokemi;

    Abstract : The polymer electrolyte membrane fuel cell (PEMFC) converts the chemical energy of hydrogen and oxygen (air) into usable electrical energy. At the cathode (the positive electrode), a considerable amount of platinum is generally required to catalyse the sluggish oxygen reduction reaction (ORR). READ MORE

  6. 24. Nanomaterials for membranes and catalysts

    Author : Stylianos Nassos; Sven Järås; Carina Lagergren; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nanotechnology; microemulsion; nanoparticles; hydrogen production; CO2 capture; selective catalytic oxidation of ammonia; activity; gasified biomass; Chemical engineering; Kemiteknik;

    Abstract : Nanotechnology is a relatively new research topic that attracts increasing interest from scientists and engineers all over the world, due to its novel applications. The use of nanomaterials has extended to a broad range of applications, for example chemical synthesis, microporous media synthesis and catalytic combustion, contributing to achievement of improved or promising results. READ MORE

  7. 25. Ghost in the shell : Studies on subsurface oxygen in oxide-derived copper nanocube catalysts

    Author : Liu Chang; Lars Pettersson; Anders Nilsson; Tore Brinck; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; teoretisk fysik; Theoretical Physics;

    Abstract : With the passage of time and the advancement of our industrial civilization, environmental concerns have become more and more recognized since the 1990s. Carbon dioxide reduction reactions are capable of converting carbon dioxide into valuable hydrocarbons and reducing the carbon emission from the combustion of fossil fuels. READ MORE