Search for dissertations about: "alkali"

Showing result 1 - 5 of 296 swedish dissertations containing the word alkali.

  1. 1. Alkali-enhanced gasification of biomass laboratory-scale experimental studies

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Albert Bach-Oller; Kentaro Umeki; Viktor Scherer; [2018]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; alkali; biomass; gasification; tar; soot; potassium; char; syngas; enhanced; Energiteknik; Energy Engineering;

    Abstract : Gasification seeks to break carbonaceous materials into synthetic gas (CO+H2) which can be subsequently upgraded into valuable products. Thus gasification can be utilized to convert low grade biomass stocks into carbon-neutral chemicals heat and power. READ MORE

  2. 2. Phthalocyanines on Surfaces Monolayers, Films and Alkali Modified Structures

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Katharina Nilson; Uppsala universitet.; [2007]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Atomic and molecular physics; Phthalocyanines; Surface Science; X-ray Photoelectron Spectroscopy XPS ; X-ray Absorption Spectroscopy XAS ; Scanning Tunneling Microscopy STM ; Density Functional Theory DFT ; Metal-free Phthalocyanine; Iron Phthalocyanine; Zinc Phthalocyanine; Gold; Graphite; Aluminium; Indium Antimony; Molecular adsorption; Monolayer; Film; Alkali; Geometrical structure; Electronic structure; Doping; Atom- och molekylfysik; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik;

    Abstract : The Phthalocyanines (Pc’s) are a group of macro-cyclic molecules, widely investigated due to the possibility to use them in a variety of applications. Electronic and geometrical structure investigations of molecular model systems of Pc’s adsorbed on surfaces are important for a deeper understanding of the functionality of different Pc-based devices. READ MORE

  3. 3. Alkali Induced Corrosion of 304L, The Influence of Potassium Salts and Water Vapour

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Jesper Pettersson; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; 304L; Alkali; Breakaway Corrosion; KCl; Oxidation; Deposit;

    Abstract : This work investigates the influence of alkali salts on the oxidation of304-type (Fe18Cr10Ni) austenitic stainless steel in laboratory and fieldexposures. Stainless steel coupons were exposed isothermally inlaboratory furnaces at 400-600 °C in 5% O2 and 5% O2 + 40% H2O.Thermobalance exposures were also performed. READ MORE

  4. 4. Alkali Metal Adsorption on Metals Studied by Hiqh Resolution Core Level Spectroscopy and Low Energy Electron Diffraction

    University dissertation from Synchrotron Radiation Research

    Author : Edvin Lundgren; [1996]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Low Energy Electron Diffraction; Physics; Core Level Spectroscopy; Surface Structures Photoelectron Emission; Single Crystal Surfaces; Alkali Adsorption; Aluminium; Metals; Alkali Metals; Fysik; LEED.; Fysicumarkivet A:1996:Lundgren;

    Abstract : Alkali metal adsorption on metals is studied by High Resolution Core Level Spectroscopy (HRCLS) and Low Energy Electron Diffraction (LEED). The studies can be divided into two parts: adsorption of alkali multilayers and alkali adsorption in the submonolayer regime. READ MORE

  5. 5. Oxygen-Alkali Treatment of Kraft Pulp and Cellobiitol. Model Experiments and Applied Studies of Interest for Oxygen Bleaching

    University dissertation from Synchrotron Radiation Research

    Author : Bengt Järrehult; [1992]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; selectivity; pH-levels; copper; oxygen delignification; catalytic effects; iron; alkali; cellobiitol; magnesium; yield;

    Abstract : During oxygen delignification of kraft pulp the alkalinity has a decisive influence upon the selectivity, defined as viscosity at a given kappa number. Using 0.2% pulp consistency in order to achieve constant pH-levels a minimum selectivity was reached at pH 13, corresponding to 0.1 M NaOH. READ MORE