Search for dissertations about: "SiO2 Al2O3 ratio"

Showing result 1 - 5 of 19 swedish dissertations containing the words SiO2 Al2O3 ratio.

  2. 1. Alkylation and Hydrodearomatization over Zeolite cCatalysts

    Author : Jun-Jun Yuan; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Acid catalysts; ZSM-5 catalysts; ethylbenzene; toluene; temperature; diesel fuel; hydrodearomatization; benzene; acidic protons; activity and selectivity; aqueous ethanol; Pt Y zeolite; gasoline; pressure; GC; diethylbenzene; Hydrocracking; SiO2 Al2O3 ratio; alkylation of aromatics; Brønsted acids;

    Abstract : The alkylation of aromatic compounds is widely used in the large-scale synthesis of petrochemicals, and a great variety of fine chemicals and intermediates. Acid catalysts used for alkylation of aromatic hydrocarbons are Brønsted acids containing acidic protons. READ MORE

  4. 2. Preparation of New Catalytic Materials by Small Particle Technology

    Author : Anders Törncrona; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : New techniques for preparation of catalytic materials with novel properties are presented in this thesis. Three new catalytic materials; washcoated fibres, highly dispersed metal oxides on titania coated silica particles and discrete colloidal ZSM-5 crystals with a low SiO2/Al2O3 ratio have been prepared and characterised. READ MORE

  5. 3. Synthesis of Zeolites from Bolivian Raw Materials for Catalysis and Detergency Applications

    Author : Gustavo Garcia; Linda Sandström; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical Technology; Kemisk teknologi;

    Abstract : Zeolites are very useful in many technological applications such as catalysis, separation and purification of gases and solvents, ion-exchange, etc. The production of zeolites is nowadays carried out with a variety of reagents, such starting materials render large scale production of zeolites expensive. READ MORE

  6. 4. Synthesis and applications of low silica zeolites from Bolivian clay and diatomaceous earth

    Author : Javier Gustavo Garcia Mendoza; Johanne Mouzon; Niklas Hedin; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Zeolites; Synthesis; clay; diatomite; adsorption; ion exchange; Chemical Technology; Kemisk teknologi;

    Abstract : The aim of the present work was to develop synthesis routes to produce synthetic zeolites with industrial attractiveness from non-expensive Bolivian raw materials, such as clays and diatomite. In particular, the work was focused on the synthesis of low-silica zeolites with the LTA and FAU structures. READ MORE

  7. 5. Metal Gate Technology for Advanced CMOS Devices

    Author : Gustaf Sjöblom; Jörgen Olsson; Stefan de Gendt; Uppsala universitet; []
    Keywords : Electronics; metal gate; high-k dielectrics; titanium nitride; zirconium nitride; MOSFET; thin film; work function; XPS; Elektronik;

    Abstract : The development and implementation of a metal gate technology (alloy, compound, or silicide) into metal-oxide-semiconductor field effect transistors (MOSFETs) is necessary to extend the life of planar CMOS devices and enable further downscaling. This thesis examines possible metal gate materials for improving the performance of the gate stack and discusses process integration as well as improved electrical and physical measurement methodologies, tested on capacitor structures and transistors. READ MORE